Relevant bibliographies by topics / Casting porosity

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Casting porosity'

Author: Grafiati
Published: 4 June 2021
Last updated: 10 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Casting porosity.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Casting porosity"

1

Říhová, M., J. Cech, and J. Havlíčková. "Evaluation of Porosity in Al Alloy Die Castings." Archives of Foundry Engineering 12, no. 1 (January 1, 2012): 93–98. http://dx.doi.org/10.2478/v10266-012-0018-9.

Full text
Abstract:
Evaluation of Porosity in Al Alloy Die Castings Mechanical properties of an Al-alloy die casting depend significantly on its structural properties. Porosity in Al-alloy castings is one of the most frequent causes of waste castings. Gas pores are responsible for impaired mechanical-technological properties of cast materials. On the basis of a complex evaluation of experiments conducted on AlSi9Cu3 alloy samples taken from the upper engine block which was die-cast with and without local squeeze casting it can be said that castings manufactured without squeeze casting exhibit maximum porosity in the longitudinal section. The area without local squeeze casting exhibits a certain reduction in mechanical properties and porosity increased to as much as 5%. However, this still meets the norms set by SKODA AUTO a.s.
APA, Harvard, Vancouver, ISO, and other styles
2

Niakan, Ali Asghar, M. H. Idris, A. Ourdjini, and Majid Karimian. "Effect of Applying Air Pressure on Gas Porosity in Lost Foam Casting of Al-Si Alloy." Advanced Materials Research 628 (December 2012): 150–55. http://dx.doi.org/10.4028/www.scientific.net/amr.628.150.

Full text
Abstract:
The paper presents the result of investigation on aluminum-silicon (LM6) alloy cast using pressurized lost foam casting process. The study investigated the effect of pressure and sand size on porosity of the casting produced. Air pressure of 1, 2, 3 and 4 bars was applied on the solidifying alloy poured in mould of sand sizes 16-30, 40-60, 60-100 (AFS). The porosities of casting were measured using optical microscope which was equipped with image analyzer. For porosity of castings, all surfaces of solidified castings were captured by digital camera for better observation. The results show that applying pressure during solidification of the LM6 alloy has significant influence on casting porosity of the alloy. By increasing the applied pressure, the porosity percentage based on gas porosity decreased when pressure was applied. Consequently, the removal rate of gas porosity improved by increasing the sand size to finer size 60-100 (AFS), so there is less gas porosity in samples. Besides, rising air pressure lead to fulfilling of molten which improves the casting porosity.
APA, Harvard, Vancouver, ISO, and other styles
3

Roskosz, Stanisław, Jacek Nawrocki, and Krzysztof Kubiak. "Porosity of Solid and Cored Turbine Blades of Aircraft Engines." Solid State Phenomena 226 (January 2015): 115–18. http://dx.doi.org/10.4028/www.scientific.net/ssp.226.115.

Full text
Abstract:
Paper presents results of quantitative evaluation of porosity conducted on big, thin walled airfoil turbine blades made from Inconel 713C alloy. To decrease mass, blades are design and manufacture like thin walled cored castings. Manufacturing of big thin walled casting airfoil blades is extremely difficult. During exploitation casting work undergo cycle fatigue. In that cause casting should be free of casting defects, including porosity. Conducted research focused on Inconel 713C superalloy pouring temperature effect on porosity level of cored casted turbine blade. Results were compared to porosity of solid casted turbine blade. It was found that porosity of cored blades is lower than solid blade porosity. In cored blades higher porosity is located on airfoil convex side. Airfoil concave side has lower porosity.
APA, Harvard, Vancouver, ISO, and other styles
4

Boroń, Kinga. "Evaluation of porosity of AlZn5Mg castings made by squeeze casting technology." Acta Innovations, no. 32 (July 1, 2019): 12–19. http://dx.doi.org/10.32933/actainnovations.32.2.

Full text
Abstract:
The paper shows the results of research aimed to assess the impact of high squeeze pressure on the porosity of AlZn5Mg alloy castings, including its distribution in slab-type castings with dimensions of 25 x 100 x 200 mm. The research was carried out on castings made by two methods: squeeze casting and gravity casting. The pressing was conducted at a pressure of 100 MPa at an initial mould temperature of 200°C. The research identified the middle and outer parts of the casting. Experimental research was preceded by numerical simulation of the casting solidification, then a porosity assessment was carried out using the hydrostatic weighing method, which was supplemented by structural observations. The results of the research showed a two-fold decrease in the porosity in the middle part of the casting which is most exposed to the occurrence of shrinkage voids formed in the final clotting phase. Structural tests revealed the occurrence of dispersed porosity in castings, mainly of shrinkage and / or shrinkage-gas origin. The impact of pressure of 100 MPa during solidification caused fragmentation of the primary structure of castings, which resulted in a higher grain density.
APA, Harvard, Vancouver, ISO, and other styles
5

Liu, Zi Kang, Min Luo, Da Quan Li, Long Fei Li, and Jian Feng. "Effects of Process Parameters on Shrinkage Porosity in 357 Semi-Solid Die Casting Parts." Materials Science Forum 993 (May 2020): 166–71. http://dx.doi.org/10.4028/www.scientific.net/msf.993.166.

Full text
Abstract:
The shrinkage porosity that was caused by the insufficient feeding during solidification, was a common defect in the semi-solid die casting process. This defect decreased significantly the mechanical properties of the casting. In order to avoid the shrinkage porosity in casting, the die design, slug preparation and die casting process were carefully considered. In this study, a designed mold was used to make the sequential solidification of the slug. The process parameters, including intensification pressure, die temperature and biscuit thickness of the casting, were studied to show their influence on shrinkage porosity defects. The experimental results show that the high intensification pressure, high die temperature and long biscuit can be beneficial to obtain castings with no shrinkage porosity.
APA, Harvard, Vancouver, ISO, and other styles
6

Izman, S., Amirreza Shayganpour, and M. H. Idris. "Effect of Casting Parameters on Porosity in LFC." Applied Mechanics and Materials 148-149 (December 2011): 1198–201. http://dx.doi.org/10.4028/www.scientific.net/amm.148-149.1198.

Full text
Abstract:
Cast aluminium alloys often contain microstructural defects resulting from the casting process such as porosity. Developments of Lost foam casting (LFC) process is considered as one of the most rapid in casting technology owing to its unique advantages on energy savings and capabilities to produce castings with thin sections. In the present research, experimental investigations in lost foam casting of aluminium-silicon cast alloy, LM6, were conducted. The main objective of the study was to evaluate the effect of different pouring temperatures, slurry viscosities, vibration times and sand sizes on the porosity of castings. A stepped pattern was used in the study and the focus of the investigations was at the thinnest 3 mm section. A full 2-level factorial design experimental technique was employed to plan the experiment and subsequently identify the significant factors which affect the casting porosity. The result shows that increasing in the pouring temperature decreases the porosity in the thin-wall section and finer sand size is more favourable than coarse size for LFC mould making process.
APA, Harvard, Vancouver, ISO, and other styles
7

Samavedam, S., and S. Sundarrajan. "Al-Si and Al-Si-Mg Cast Alloys Shrinkage Porosity Estimation." Archives of Foundry Engineering 16, no. 1 (March 1, 2016): 61–68. http://dx.doi.org/10.1515/afe-2016-0004.

Full text
Abstract:
Abstract US A356 and US 413 cast aluminium alloys shrinkage characteristic have been discussed in the present study. Specific volume reduction leads to shrinkage in castings and it can be envisaged as a casting defect. Finite difference based casting process simulation software has been used to study the shrinkage characteristic and it is quantified using mathematical formulae. The three dimensional model of the shrinkage defect has been constructed using CAD application software. Shrinkage characteristic has also been quantified through experimental validation studies and compared well with casting process simulation. Shrinkage characteristic study and control is essential for producing defect free castings. Influence of casting shape on the shrinkage characteristic has been studied in this paper.
APA, Harvard, Vancouver, ISO, and other styles
8

Nadolski, M., Z. Konopka, M. Łągiewka, and A. Zyska. "The Influence of the Mould Filling Conditions on the Quality of Castings Made of EN AC-44000 Alloy." Archives of Foundry Engineering 14, no. 2 (June 1, 2014): 19–22. http://dx.doi.org/10.2478/afe-2014-0029.

Full text
Abstract:
Abstract The work deals with the influence of change in the filling conditions of the ceramic moulds with plaster binder on the presence of gaseous porosity and the microstructure of the achieved test castings with graded wall thickness. Castings made of EN AC-44000 alloy, produced either by gravity casting, or by gravity casting with negative pressure generated around the mould (according to the Vacumetal technology), or by counter-gravity casting were compared. The results of examinations concerning the density of the produced castings indicate that no significant change in porosity was found. The increased size of silicon crystals was found for the increased wall thicknesses due to the slower cooling and solidification of castings.
APA, Harvard, Vancouver, ISO, and other styles
9

O'Donnell, Robert G., Dayalan R. Gunasegaram, and Michel Givord. "Die Casting Improvements through Melt Shear." Materials Science Forum 618-619 (April 2009): 33–37. http://dx.doi.org/10.4028/www.scientific.net/msf.618-619.33.

Full text
Abstract:
Melt flow and solidification within a die casting cavity is a complex process dependent in part on melt pressure (with or without intensification), melt velocity, melt flow path, thermal gradients within the die, die lubrication and melt viscosity. Casting defects such as short shots, cold shuts and shrinkage porosity can readily occur if casting conditions are not optimised. Shrinkage porosity in particular is difficult to eradicate from castings that comprise thick sections, since these sections will usually solidify late in the casting cycle and may be starved of melt supply during the critical solidification (and contraction) stage. The current work seeks to elucidate the influence of the melt shearing on the die casting process and demonstrates that the modifications made to the melt through introduction of a local constriction in the melt path can generate improvements in casting microstructure and reduce shrinkage porosity.
APA, Harvard, Vancouver, ISO, and other styles
10

Izman, S., Amirreza Shayganpour, M. H. Idris, and Hassan Jafari. "DOE Analysis of the Influence of Sand Size and Pouring Temperature on Porosity in LFC." Applied Mechanics and Materials 121-126 (October 2011): 2661–65. http://dx.doi.org/10.4028/www.scientific.net/amm.121-126.2661.

Full text
Abstract:
Lost foam casting is a relatively new process in commercial terms and is widely used to produce defect free castings owing to its advantages like producing complex shape and acceptable surface finish. In the present research, experimental investigations in lost foam casting of aluminium-silicon cast alloy, LM6, were conducted. The main objective of the study was to evaluate the effect of different sand sizes and pouring temperatures on the porosity of thin-wall castings. A stepped pattern was used in the study and the focus of the investigations was at the thinnest 3 mm section. A full 2-level factorial design experimental technique was employed to plan the experiment and subsequently identify the significant factors which affect the casting porosity. The result shows that increasing in the pouring temperature decreases the porosity in the thin-wall section of casting. Finer sand size is more favourable than coarse size for LFC mould making process.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Dissertations / Theses on the topic "Casting porosity"

1

Jonker, A., and JH Potgieter. "An evaluation of selected waste resources for utilization in ceramic materials applications." Elsevier, 2004. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1000929.

Full text
Abstract:
Many industrial processes generate large amounts of waste. Typical examples include the fertiliser industry (phosphogypsum), ferro-alloy and steel producers (slag), as well as the power generating industry (fly ash). Although some waste products are currently used to a limited extend (e.g. fly ash and cement in cement), there is a constant need to find more uses and newapplications for these. This investigation describes work done to develop a novel ceramic body, which can potentially be used as a ceramic filter for purification of waste water and potable water.
APA, Harvard, Vancouver, ISO, and other styles
2

Albonetti, Rob. "Porosity and intermetallic formation in lost foam casting of 356 alloy." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0018/MQ58012.pdf.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Du, Pengfei. "Numerical modeling of porosity and macrosegregation in continuous casting of steel." Diss., University of Iowa, 2013. https://ir.uiowa.edu/etd/2482.

Full text
Abstract:
The continuous casting process is a widely used technique in modern steel plants. However, it is a complicated process that is not well understood. The objective of this research is to model the porosity and macrosegregation due to shrinkage related effects and solid deformation in the continuous casting of steel. Solid phase movements due to bulging and variable roll gap are modeled with a simple algebraic equation based on assumed slab surface deflection. A simplified single domain fluid flow model is derived to predict the pressure field. When liquid pressure drops to zero, porosity starts to form. The distribution of porosity is calculated using the porosity equation which is based on the mass conservation. A macrosegregation model based on the species conservation is derived. With the relative velocity calculated from the pressure results and the solid velocity, macrosegregation is obtained. Since the solid phase velocity is not zero and mixture density is not assumed to be constant, porosity and macrosegregation due to both solid deformation and shrinkage effects are incorporated. In order to validate the model, the pressure field of a three-dimensional pure metal solidification system is simulated. The results show the feasibility of the proposed model to predict the fluid flow. The porosity and macrosegregation prediction for different casting conditions are performed. The results confirm the necessity of including solid phase deformation in the prediction of porosity and centerline macrosegregation. The results also reveal the relations between different operating conditions (such as degree of bulging, soft reduction, and casting speed) and the porosity/macrosegregation defects in the final product.
APA, Harvard, Vancouver, ISO, and other styles
4

Siavashi, Kiavash. "The effect of casting parameters on the fluidity and porosity of aluminium alloys in the aost foam casting process." Thesis, University of Birmingham, 2012. http://etheses.bham.ac.uk//id/eprint/3525/.

Full text
Abstract:
The Lost Foam Casting process has been firmly established for Aluminium and ferrous alloys. This process offers many advantages over conventional casting processes but its full potential has yet to be reached due to the many defects introduced to the casting associated with decomposition of the foam pattern during mould filling. The foam pattern commonly used in this process is Expanded Polystyrene (EPS) which degrades to liquid and vapour byproducts. The liquid decomposition byproducts travel to the metal/mould interface, where the globules of liquid foam can become trapped against the coating and their molecular weight is reduced due to the heat from the molten metal. At the same time, they release bubbles of gas into the castings. These globules can wick into the refractory coating only if their molecular weight is sufficiently reduced to below a critical molecular weight. In this study, to improve the quality of Aluminium alloys made by Lost Foam Casting, easier removal of the decomposition byproducts was obtained by using low molecular weight foam patterns. The molecular weight of expanded Polystyrene was not reduced when it was exposed to γ-rays because of cross-linking while the molecular weight of Poly Methyl Methacrylate (PMMA) was significantly due to chain session. Therefore, plates of Probead-70™ (a copolymer of Polystyrene 30 wt %-Poly Methyl Methacrylate 70 wt %) were exposed to γ-rays and reduced their molecular weight by up to about 85% below the critical molecular weight value. With low molecular weight foam patterns the decomposition byproducts require less reduction to reach the critical molecular weight to become absorbed by the coating, and consequently less defects are introduced into the casting. γ-radiation was employed to reduce the molecular weight of the foam. The porosity content of the castings was significantly reduced leading to an improvement of their mechanical properties such as their fatigue life which was increased by 100%. Lost Foam Casting has also been reported to experience complexities with fluidity. Misrun is likely to occur in Lost Foam Casting due to the formation of a large amount of gas at the metal/foam interface, increasing the back pressure, compared to the conventional castings. This reduces the velocity of the molten metal which might lead to solidification of the molten metal before filling the mould entirely. In the current work, a reproducible fluidity test was designed and the effects of different casting parameters on fluidity were examined. In some of the castings inserted thermocouples were employed to study the filling behaviour to determine the velocity of molten metal, thickness of the metal/foam interface and the time of freezing. It was concluded that it is not recommended to alter the coating thickness in order to improve fluidity, because the effect of coating thickness depends on the pouring temperature of the castings and permeability of the coating. The metallostatic pressure was found to affect the fluidity insignificantly (within the values in the current work, 2600-2700 Pa). Instead, increasing coating permeability, decreasing the density of the foam pattern and increasing the pouring temperature were found to increase the fluidity in Lost Foam Casting. However the effect of increasing pouring temperature and decreasing foam density may be detrimental to the quality of castings. The molecular weight of the foam pattern and the use of brominated foam patterns did not have a considerable effect on fluidity in Lost Foam Casting. It was also found that solidification in the Lost Foam Casting occurs at the metal/foam interface. A heat balance between the molten metal and the mould, and the foam pattern, was developed to give a fluidity equation to aid interpretation of the fluidity results. In summary, this research has provided a better understanding of the effect of casting parameters on the fluidity of Lost Foam Casting and the heat transfer from the molten metal to the foam pattern and to the mould. In addition, the quality of AL alloys castings was improved by reducing the molecular weight of the foam pattern used in the Lost Foam Casting process.
APA, Harvard, Vancouver, ISO, and other styles
5

Binney, Matthew N. "Porosity reduction in high pressure die casting through the use of squeeze pins /." [St. Lucia, Qld.], 2006. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe19810.pdf.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Li, Dongfa. "Microstructures and mechanical properties of palladium-silver dental casting alloys." Columbus, Ohio : Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1143105462.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Khalajzadeh, Vahid. "Modeling of shrinkage porosity defect formation during alloy solidification." Diss., University of Iowa, 2018. https://ir.uiowa.edu/etd/6155.

Full text
Abstract:
Among all casting defects, shrinkage porosities could significantly reduce the strength of metal parts. As several critical components in aerospace and automotive industries are manufactured through casting processes, ensuring these parts are free of defects and are structurally sound is an important issue. This study investigates the formation of shrinkage-related defects in alloy solidification. To have a better understanding about the defect formation mechanisms, three sets of experimental studies were performed. In the first experiment, a real-time video radiography technique is used for the observation of pore nucleation and growth in a wedge-shaped A356 aluminum casting. An image-processing technique is developed to quantify the amount of through-thickness porosity observed in the real-time radiographic video. Experimental results reveal that the formation of shrinkage porosity in castings has two stages: 1-surface sink formation and 2- internal porosity evolution. The transition from surface sink to internal porosity is defined by a critical coherency limit of . In the second and third experimental sets, two Manganese-Steel (Mn-Steel) castings with different geometries are selected. Several thermocouples are placed at different locations in the sand molds and castings to capture the cooling of different parts during solidification. At the end of solidification, castings are sectioned to observe the porosity distributions on the cut surfaces. To develop alloys’ thermo-physical properties, MAGMAsoft (a casting simulation software package) is used for the thermal simulations. To assure that the thermal simulations are accurate, the properties are adjusted to get a good agreement between simulated and measured temperatures by thermocouples. Based on the knowledge obtained from the experimental observations, a mathematical model is developed for the prediction of shrinkage porosity in castings. The model, called “advanced feeding model”, includes 3D multi-phase continuity, momentum and pore growth rate equations which inputs the material properties and transient temperature fields, and outputs the feeding velocity, liquid pressure and porosity distributions in castings. To solve the model equations, a computational code with a finite-volume approach is developed for the flow calculations. To validate the model, predicted results are compared with the experimental data. The comparison results show that the advanced feeding model can accurately predict the occurrence of shrinkage porosity defects in metal castings. Finally, the model is optimized by performing several parametric studies on the model variables.
APA, Harvard, Vancouver, ISO, and other styles
8

Lee, Soon Gi. "Quantitative Characterization of Processing-Microstructure-Properties Relationships in Pressure Die-Cast Mg Alloys." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/11552.

Full text
Abstract:
The central goal of this research is to quantitatively characterize the relationships between processing, microstructure, and mechanical properties of important high-pressure die-cast (HPDC) Mg-alloys. For this purpose, a new digital image processing technique for automatic detection and segmentation of gas and shrinkage pores in the cast microstructure is developed and it is applied to quantitatively characterize the effects of HPDC process parameters on the size distribution and spatial arrangement of porosity. To get better insights into detailed geometry and distribution of porosity and other microstructural features, an efficient and unbiased montage based serial sectioning technique is applied for reconstruction of three-dimensional microstructures. The quantitative microstructural data have been correlated to the HPDC process parameters and the mechanical properties. The analysis has led to hypothesis of formation of new type of shrinkage porosity called, gas induced shrinkage porosity that has been substantiated via simple heat transfer simulations. The presence of inverse surface macrosegregation has been also shown for the first time in the HPDC Mg-alloys. An image analysis based technique has been proposed for simulations of realistic virtual microstructures that have realistic complex pore morphologies. These virtual microstructures can be implemented in the object oriented finite elements framework to model the variability in the fracture sensitive mechanical properties of the HPDC alloys.
APA, Harvard, Vancouver, ISO, and other styles
9

Raza, Mohsin. "Process development for investment casting of thin-walled components : Manufacturing of light weight components." Licentiate thesis, Mälardalens högskola, Innovation och produktrealisering, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-27807.

Full text
Abstract:
Manufacturing processes are getting more and more complex with increasing demands of advanced and light weight engineering components, especially in aerospace industry. The global requirements on lower fuel consumption and emissions are increasing the demands in lowering weight of cast components. Ability to produce components in lower wall thickness will not only help to reduce the cost of production but also help to improve the efficiency of engineering systems resulting in lower fuel consumption and lesser environmental hazardous emissions. In order to produce thin-walled components, understanding of mechanism behind fluidity as it is effected by casting parameters is very important. Similarly, for complex components study of solidification morphology and its effects on castability is important to understand. The aim of this work was to investigate casting of thin-walled test geometries (less than 2mm) in aero-space grades of alloys. The casting trials were performed to investigate the fluidity as a function of casting parameters and filling system in thin-walled sections. Test geometries with different thickness were cast and evaluated in terms of filled area with respect to casting parameters, ı.e. casting temperature and shell preheat temperature. Different feeding systems were investigated to evaluate effects of filling mode on castability. Similarly for complex components where geometries are very organic in shape, solidification morphology effects the quality of castings. Process parameters, that effect the solidification morphology were identified and evaluated. In order to develop a relation between defect formation and process parameters, solidification behaviour was investigated using simulations and casting trials. Similarly the effect of factors that influence grain structure and flow related defects were studied. It was observed that fluidity is affected by the mode of geometry filling in investment casting process. The filling mode also have different effect on defect formation. A top-gated configuration is strongly affected by casting parameters where as a bottom-gated configuration is more stable and thus fluidity is not significantly affected by variation in casting parameters. Less porosity and flow-related defects were observed in the bottom-gated system as compared to top-gated system. In the study about casting defects as affected by process parameters, it was observed that shell thickness is important to avoid interdendritic shrinkage. It was observed that the increased shell thickness induces a steeper thermal gradient which is essential in order to minimize the width of the mushy zone. It was also observed that a slower cooling rate along with a steeper thermal gradient at the metal-mould interface not only helps to avoid shrinkage porosity but also increases fill-ability in thinner sections. The work presented here is focused on the optimization of process parameters, in order, for instance, to improve castability and reduce the casting defects in investment casting process. The work, however, does not focus on externally influencing the casting conditions or modifying the casting/manufacturing process. The future work towards PhD will be focused on externally improving the casting conditions and investigating other possible route of manufacturing for thin, complex components.
APA, Harvard, Vancouver, ISO, and other styles
10

Heyvaert, Laurent. "Modélisation de la formation des structures et des microporosités durant la solidification d'alliages d'aluminium." Thesis, Université de Lorraine, 2015. http://www.theses.fr/2015LORR0265/document.

Full text
Abstract:
Cette thèse s’inscrit dans le projet PRINCIPIA (PRocédés INdustriels de Coulée Innovants Pour l'Industrie Aéronautique) de l’ANR MATETPRO (Matériaux et Procédés pour des Produits Performants). L'objectif de ce projet est la promotion de nouveaux alliages aluminium-cuivre-lithium à destination de l'industrie aéronautique afin d'apporter une alternative aux composites. Cependant, ces alliages sont sujet à une importante porosité pour deux raisons : une forte solubilité à l'hydrogène et une facilité d'oxydation. Dans ce projet, le but de la thèse était d'établir un modèle de prédiction de la porosité à l'échelle du produit. La porosité se forme lors de la solidification de l’alliage à cause d'une plus faible solubilité de l'hydrogène dans le solide. La teneur en hydrogène dans la phase liquide va augmenter par ségrégation et provoquer la nucléation des pores. Il est donc nécessaire de prendre en compte la solidification dans la modélisation de la porosité. De plus, la composition locales modifie la cinétique de croissance des pores et la microstructure exerce une contrainte mécanique sur les pores qui modifie leur équilibre chimique. Après une première partie consacrée à améliorer les connaissances sur les phénomène de transport dans la coulée semi-continue d'aluminium, nous avons modélisé la formation de porosité en se basant sur les modèles disponibles. Le modèle a reproduit l'inhomogénéité de la porosité observée expérimentalement sur une plaque d'alliage aluminium-magnésium. L'analyse nous a montré que la limitation de la croissance par le temps de diffusion de l'hydrogène était responsable de ce profil particulier. La densité volumique des pores est critique pour la limitation de la croissance par la diffusion de l’hydrogène. En fonction de la densité, la croissance passe d'une croissance limitée à une croissance non limitée
This thesis is part of the project PRINCIPIA (PRocédés INdustriels de Coulée Innovants Pour l'Industrie Aéronautique) of the ANR MATEPRO (MATériaux Et PROcédés pour des produits performants). The goal of this project is the promotion of new aluminum-copper-lithium alloys for the aeronautic industry in order to propose an alternative to composite materials. Unfortunately, these alloys are highly sensitive to the appearance of porosity during the alloy creation process. It is due to a high hydrogen solubility and oxidation. Inside this project, my work was to establish a porosity model at the scale of the ingot. Porosity starts to develop during the solidification process due to a lower solubility of hydrogen in the solid phase. Hydrogen content in liquid phase increases by segregation and leads to pores' nucleation. Thus, it is necessary to take into account solidification for porosity-modeling purposes. It is even more important because the alloys' local composition alters the pores' growth and the microstructure modifies the chemical equilibrium by pinching effect.After a first part dedicated to general improvement of knowledge about transport phenomena in DC casting, the porosity formation model was developed based on model found in literature. The model was able to reproduce the inhomogeneity experimentally observed in an aluminum-magnesium ingot. This profile is explained by the hydrogen diffusion time which limits the pore growth. The pore density is critical for the growth limitation by hydrogen diffusion. Depending on the density, the growth switch from a non limited to a limited growth
APA, Harvard, Vancouver, ISO, and other styles
More sources

Books on the topic "Casting porosity"

1

Kaufman, J. Gilbert, and Elwin L. Rooy. Aluminum Alloy Castings. ASM International, 2004. http://dx.doi.org/10.31399/asm.tb.aacppa.9781627083355.

Full text
Abstract:
Aluminum Alloy Castings: Properties, Processes and Applications is a practical guide to the process, structure, property relationships associated with aluminum alloy castings and casting processes. It covers a wide range of casting methods, including variations of sand casting, permanent mold casting, and pressure die casting, showing how key process variables affect the microstructure, properties, and performance of cast aluminum parts. Other chapters provide similar information on the effects of alloying and heat treating and the influence and control of porosity and inclusions. A significant portion of the book contains curated collections of property and performance data, including many previously unpublished aging response curves, growth curves, and fatigue curves; tensile properties at high and low temperatures and at room temperature after high-temperature exposure; the results of creep rupture tests conducted at temperatures from 212 to 600 °F (100 to 315 °C); and stress-strain curves obtained from casting alloys in various tempers under tensile or compressive loads. The book also discusses the factors that contribute to corrosion and fracture resistance and includes test specimen drawings as well as a glossary of terms. For information on the print version, ISBN 978-0-87170-803-8, follow this link.
APA, Harvard, Vancouver, ISO, and other styles
2

L, Maples Anna, and United States. National Aeronautics and Space Administration., eds. MPS solidification model: Final report, analysis and calculation of macrosegregation in a casting ingot. Huntsville, Ala: General Electric Co., Space Systems Division, Huntsville Center Operations, 1985.

Find full text
APA, Harvard, Vancouver, ISO, and other styles

Book chapters on the topic "Casting porosity"

1

Kim, Young-Chan, Se-Weon Choi, Cheol-Woo Kim, Jae-Ik Cho, Sung-Ho Lee, and Chang-Seog Kang. "Limitation of Shrinkage Porosity in Aluminum Rotor Die Casting." In ICAA13 Pittsburgh, 231–36. Cham: Springer International Publishing, 2012. http://dx.doi.org/10.1007/978-3-319-48761-8_36.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Kim, Young-Chan, Se-Weon Choi, Cheol-Woo Kim, Jae-Ik Cho, Sung-Ho Lee, and Chang-Seog Kang. "Limitation of Shrinkage Porosity in Aluminum Rotor Die Casting." In ICAA13: 13th International Conference on Aluminum Alloys, 231–36. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118495292.ch36.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Khalajzadeh, Vahid, David D. Goettsch, and Christoph Beckermann. "Real-Time Radiography and Modeling of Porosity Formation in an A356 Aluminum Alloy Wedge Casting." In Shape Casting: 6th International Symposium, 35–42. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119274865.ch5.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Khalajzadeh, Vahid, David D. Goettsch, and Christoph Beckermann. "Real-Time Radiography and Modeling of Porosity Formation in an A356 Aluminum Alloy Wedge Casting." In Shape Casting: 6th International Symposium, 35–42. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-48166-1_5.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Gerrard, A. J., and W. D. Griffiths. "The Formation of Hydrogen Related Porosity by Double Oxide Film Defects in Al Alloys." In Shape Casting: 5th International Symposium 2014, 269–76. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-48130-2_33.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Gerrard, A. J., and W. D. Griffiths. "The Formation of Hydrogen Related Porosity by Double Oxide Film Defects in Al Alloys." In Shape Casting: 5th International Symposium 2014, 269–76. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9781118888100.ch33.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Saeedipour, Mahdi, Simon Schneiderbauer, Stefan Pirker, and Salar Bozorgi. "Prediction of Surface Porosity Defects in High Pressure Die Casting." In Advances in the Science and Engineering of Casting Solidification, 155–63. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781119093367.ch19.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Saeedipour, Mahdi, Simon Schneiderbauer, Stefan Pirker, and Salar Bozorgi. "Prediction of Surface Porosity Defects in High Pressure Die Casting." In Advances in the Science and Engineering of Casting Solidification, 155–63. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-48117-3_19.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Xiao, Qun Fang, Xiao Shan Ning, and Ming Fu. "Study of Affecting Factors on Porosity in Gel-Casting Foam." In Key Engineering Materials, 1117–20. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-410-3.1117.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Nicoletto, Gianni, R. Konečná, P. Baicchi, and V. Majerová. "Casting Porosity and Long-Life Fatigue Strength of a Cast Al-Alloy." In Materials Science Forum, 393–96. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-469-3.393.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Casting porosity"

1

Orient, G., J. Depsky, S. Schwartz, D. O'Connor, D. O'Connor, G. Orient, J. Depsky, and S. Schwartz. "Probabilistic casting porosity prediction methodology." In 38th Structures, Structural Dynamics, and Materials Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1997. http://dx.doi.org/10.2514/6.1997-1405.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Özdemir, Özgür, Ali Ebrinç, and Bülent Ünüvar. "Casting Porosity Elimination in CGI Cylinder Head." In SAE World Congress & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2009. http://dx.doi.org/10.4271/2009-01-0219.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Viswanathan, S., A. S. Sabau, A. J. Duncan, and Q. Han. "Next Generation Casting Process Models - Predicting Porosity and Microstructure." In Southern Automotive Manufacturing Conference & Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1998. http://dx.doi.org/10.4271/982113.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

SUSLU, Yekta Berk, Mehmet Sirac ACAR, Muammer MUTLU, and Ozgul KELES. "SEMI-SOLID ALUMINUM DIE CASTING PROCESS DESIGN FOR PREVENTING DEFECTS: POROSITY." In METAL 2019. TANGER Ltd., 2019. http://dx.doi.org/10.37904/metal.2019.753.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Wang, Yaou, and David Schwam. "Application of Bayesian Analysis Method in the Design Optimization of Permanent Casting Mold." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-86413.

Full text
Abstract:
This work is a case study of applying Bayesian analysis, a statistical data method, in the design optimization of permanent test-bar mold. The permanent test-bar mold is used in casting foundry to examine the metal quality. Since the current standard test-bar mold suffers from shrinkage porosity which detracts from best properties, a modified design is recently proposed to improve the mechanical properties. In order to validate the new design, Bayesian data analysis method is utilized to analyze the experimental data from the two designs. The effects of the mold designs and casting process operational parameters on the mechanical properties of castings are compared. Main effect to the mechanical properties is identified based on the Bayesian analysis.
APA, Harvard, Vancouver, ISO, and other styles
6

Snyder, Jessica, Philipp M. Hunger, Chengyang Wang, Ulrike G. K. Wengst, and Wei Sun. "Controlled Porosity of Ceramic Scaffold by Directional Freeze Casting and Scaffold Printing." In ASME/ISCIE 2012 International Symposium on Flexible Automation. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/isfa2012-7105.

Full text
Abstract:
The objective of this work is to produce a 3-dimensional scaffold with hierarchical porosity produced with automated manufacturing control. In this paper we present a two-step manufacturing process: solid freeform fabrication (SFF) of a polymer scaffold, followed by freeze casting, a directional solidification technique, of composite slurry. This combination allows for the production of composite scaffolds with well defined, gradient porosity in two directions. Transverse porosity is created by immersing a printed alginate scaffold in a chitosan (CS)-hydroxyapatite (HA) slurry which is freeze cast to produce a scaffold with highly aligned porosity in the longitudinal direction. The combination of these two processes, printing and freeze casting, provides engineering control over chemical, structural and mechanical cues of the interconnected microenvironment within the scaffolds over several length scales, including features like overall porosity, pore size and shape as well as the choice of material and for example the ratio of polymer to ceramic within the highly porous composite material. Thus, the material’s structure and architecture can be custom-designed by the fabrication processes to regulate diffusion throughout the scaffold as well as to potentially direct cell proliferation and migration.
APA, Harvard, Vancouver, ISO, and other styles
7

Hren, Iryna, Stefan Michna, and Lenka Michnova. "Dependence of mechanical properties on porosity of AlSi7Mg0.3 alloy during gravity casting." In 18th International Scientific Conference Engineering for Rural Development. Latvia University of Life Sciences and Technologies, 2019. http://dx.doi.org/10.22616/erdev2019.18.n076.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Gaviphatt, Natnapat, Chedtha Puncreobutr, and Prabhas Chongstitvatana. "Porosity prediction in aluminium casting using approximate functions generated by evolutionary algorithm." In 2015 12th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI-CON). IEEE, 2015. http://dx.doi.org/10.1109/ecticon.2015.7207082.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Cook, Daniel P., Sachin S. Deshmukh, and David P. Carey. "Modeling Permanent Mold Casting of Aluminum." In ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-42409.

Full text
Abstract:
Modeling the complex, coupled fluid flow, heat transfer and solidification phenomena taking place in metal casting is a challenging task. The quality of any metal casting depends on many parameters such as the type of mould, rate of filling, and rate of solidification. Optimization of these operational parameters is very important in reducing casting defects such as oxide inclusions and porosity. This paper addresses the first steps in validating a computational fluid dynamics (CFD) model of permanent mold casting of aluminum. A mathematical model of the casting system has been developed using the commercial CFD package StarCD. A physical model of the system has been used to validate the mold filling phenomena in the process. Comparison of the results from these models will be presented.
APA, Harvard, Vancouver, ISO, and other styles
10

Prashanth Yadav, A., G. S. Reddy, and Md Hafeez. "Modeling and simulation of investment casting to minimize shrinkage porosity in boom post." In SEVENTH INTERNATIONAL SYMPOSIUM ON NEGATIVE IONS, BEAMS AND SOURCES (NIBS 2020). AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0057928.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Reports on the topic "Casting porosity"

1

Schwam, David. Casting Porosity-Free Grain Refined Magnesium Alloys. Office of Scientific and Technical Information (OSTI), August 2013. http://dx.doi.org/10.2172/1097772.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Prevention of Porosity Formation and Other Effects of Gaseous Elements in Iron Castings. Office of Scientific and Technical Information (OSTI), April 2005. http://dx.doi.org/10.2172/838410.

Full text
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the extended bibliographies on the topic 'Casting porosity' for particular source types:
Journal articles Dissertations / Theses
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography