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Journal articles on the topic 'Gas shrinkage porosity'

Author: Grafiati

Published: 30 May 2022

Last updated: 31 July 2025

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1

Cao, Hanxue, Qiang Zhang, Bing Jiang, et al. "Influence of die-casting process parameters on porosity defects and mechanical properties." Journal of Physics: Conference Series 3043, no. 1 (2025): 012027. https://doi.org/10.1088/1742-6596/3043/1/012027.

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Abstract This study investigates a novel heat-treatment-free aluminum alloy (Al-8.5Si-0.6Mn-0.25Mg) using vacuum die-casting to prepare samples. Utilizing industrial CT technology for precise characterization, the effects of process parameters (pouring temperature, fast shot speed, and vacuum) on porosity defects in die-castings and their subsequent impact on mechanical properties were systematically examined. The study identifies three types of porosity defects within the alloy samples: gas pores, gas shrinkage pores, and shrinkage pores. Within the range of process parameters, an increase in

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2

Dybowski, Bartłomiej, Łukasz Poloczek, and Andrzej Kiełbus. "The Porosity Description in Hypoeutectic Al-Si Alloys." Key Engineering Materials 682 (February 2016): 83–90. http://dx.doi.org/10.4028/www.scientific.net/kem.682.83.

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Al-Si alloys are the most important group among aluminum casting alloys. They are widely used in automotive and aerospace industries. Chemical modification of the Al-Si alloys leads to formation of fine, fibrous Al-Si eutectic mixture ensuring high mechanical properties. The modification is however known to increase the alloy porosity, which may, in turn, result in decrease of its properties. The following paper presents results of the research on quantitative description of the Al-Si cast alloys porosity and influence of Na modification on the porosity of AlSi9Mg alloy. Porosity in the hypoeu

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3

Kim, Sung Bin, Young Hoon Yim, Joong Mook Yoon, and Doru Michael Ştefănescu. "Prediction of Shrinkage Defects in Iron Castings Using a Microporosity Model." Materials Science Forum 925 (June 2018): 411–18. http://dx.doi.org/10.4028/www.scientific.net/msf.925.411.

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A numerical model for prediction of shrinkage defects in iron castings has been developed. The model is based on gas pores evolution during solidification. It describes the evolution of gas concentration using mass conservation, and the change in melt pressure due to solidification contraction using Darcy’s equation, with mixture continuity assumption in the liquid and the mushy zone. Gas pores nucleation has been calculated using the partial pressure of gas obtained from Sievert’s law. The growth of porosity has been estimated using an equation based upon the total melt pressure on the pore,

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4

Roskosz, Stanisław. "Quantitative Characterization of Shrinkage and Gas Pores in Turbine Blades Made of MAR M247 and IN 713C Superalloys." Solid State Phenomena 197 (February 2013): 64–69. http://dx.doi.org/10.4028/www.scientific.net/ssp.197.64.

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The subject matter of the paper is the quantitative evaluation of gaseous and shrinkage porosity in construction elements of a low-pressure aircraft engine turbine using quantitative metallography methods. The research material comprised blades and blade segments with a polycrystalline structure made of IN 713C and MAR M247 superalloys. One of the major problems that occur in the precision castings is their porosity: gaseous, which is the result of emission of dissolved gases from the superalloy during solidification, and shrinkage, being the result of shrinkage of the superalloy and of insuff

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5

SOLDATOV, V. G., D. A. ILYUSHKIN, and I. A. KOTLYAROVA. "APPLICATION OF REGRESSION ANALYSIS METHODS AND HIERARCHY ANALYSIS TO THE SELECTION OF TIN BRONZE CASTING PARAMETERS." Herald of Technological University 27, no. 5 (2024): 117–21. http://dx.doi.org/10.55421/1998-7072_2024_27_5_117.

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The influence of casting technological parameters on the presence and types of defects (shrinkage sinks, shrinkage porosity, cracks) of castings from tin bronze BrO3C7C5H1 has been investigated. By the method of regression analysis it was established that the change of tin concentration in the alloy, the temperature of metal release from the furnace, the strength of the molding mixture and the duration of mold pouring in the production conditions under consideration do not have a significant effect on the defect of the casting. The type of defects and the proportion of rejects are related to t

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6

Thanabumrungkul, S., W. Jumpol, Rungsinee Canyook, N. Meemongkol, and Jessada Wannasin. "Characterization of Microstructure and Shrinkage Porosity of a Semi-Solid Metal Slurry in Gravity Die Casting." Solid State Phenomena 285 (January 2019): 161–66. http://dx.doi.org/10.4028/www.scientific.net/ssp.285.161.

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Current aluminum automotive parts such as wheels, engine and transmission components are produced by tilted gravity die casting for control gas porosity. But, there are still problems resulting in inefficient production: shrinkage porosity, microstructure size and uniformity. Shrinkage porosity is one of the major issues which affects mechanical properties such as strength and elongation in tilted pour permanent mold. Recent work using slurry casting technique has shown potential in gravity sand casting. Results show that the casting parts have complete filling at low solid fractions and the c

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7

Ignaszak, Z., and J. Hajkowski. "Contribution to the Identification of Porosity Type in AlSiCu High-Pressure-Die-Castings by Experimental and Virtual Way." Archives of Foundry Engineering 15, no. 1 (2015): 143–51. http://dx.doi.org/10.1515/afe-2015-0026.

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Abstract The paper concerns the problem of discontinuity in high pressure die castings (HPDC). The compactness of their structure is not perfect, as it is sometimes believed. The discontinuities present in these castings are the porosity as follow: shrinkage and gas (hydrogen and gas-air occlusions) origin. The mixed gas and shrinkage nature of porosity makes it difficult to identify and indicate the dominant source. The selected parameters of metallurgical quality of AlSi9Cu3 alloy before and after refining and the gravity castings samples (as DI - density index method), were tested and evalu

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8

Wannasin, Jessada, Marc Fuchs, Ji Yong Lee, Cheol Ung Lee, T. V. L. Narasimha Rao, and Merton C. Flemings. "GISS Technology: Principle and Applications in Die Casting." Solid State Phenomena 285 (January 2019): 470–75. http://dx.doi.org/10.4028/www.scientific.net/ssp.285.470.

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In the past, there have been a lot of effort to solve gas and shrinkage porosity defects in die casting. The common solutions are vacuum technology, jet cooling technology, and application of squeeze pins. However, these solutions often increase the die casting production costs. A new solution that has recently been introduced worldwide is GISS Technology. This technology applies the superheated slurry casting process. Gas and shrinkage porosity defects can be reduced. Furthermore, the production costs are lowered due to die life extension, cycle time reduction, melting energy reduction, and l

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9

Rashid, Abira. "Optimization of Shrinkage Porosity in Grinding Media Balls by Casting Design Modification and Simulation Technique." International Journal for Research in Applied Science and Engineering Technology 9, no. VIII (2021): 344–53. http://dx.doi.org/10.22214/ijraset.2021.37352.

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Shrinkage porosity or cavity are associated with the solidification of the metal either due to gas/air entrapment or when the shrinkage occurring during solidification is not entirely compensated by the riser. Shrinkage cavities occurring in the casting reduces its strength which leads to unfulfillment of the desired serviceability. In this paper, casting design has been modified using the DISA manual to achieve directional solidification which directly relates to improvement of casting quality. The running of metal from pouring basin into casting along with solidification has been analysed th

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10

Rattanadakul, Sureebhorn, Jessada Wannasin, Somjai Janudom, Thawatchai Plookphol, and Sirikul Wisutmethangoon. "Effects of Solid Fractions in a Slurry Casting Process on Shrinkage and Microstructure of 7075 Aluminum Alloy." Advanced Materials Research 968 (June 2014): 125–28. http://dx.doi.org/10.4028/www.scientific.net/amr.968.125.

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Effects of Gas Induce Semi Solid (GISS) on shrinkage porosity of 7075 aluminum alloy were investigated. Initial solid fractions were controlled by rheocasting time at 5, 10 and 15 seconds and 4 and 6 bar of gas pressure. The results showed that the initial solid fractions were increased by increasing rheocasting time and gas pressure. As for the shrinkage, values of the GISS process samples were lower than those of the conventional process samples. In addition, the shrinkage areas of semi solid samples were decreased by increasing the initial solid fractions. The microstructure of semi solid s

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11

Zhou, Fengde, Guangqing Yao, Zhonghua Tang, and Oyinkepreye D. Orodu. "Influence and Sensitivity Study of Matrix Shrinkage and Swelling on Enhanced Coalbed Methane Production and CO2 Sequestration with Mixed Gas Injection." Energy Exploration & Exploitation 29, no. 6 (2011): 759–75. http://dx.doi.org/10.1260/0144-5987.29.6.759.

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Matrix compressibility, shrinkage and swelling can cause profound changes in porosity and permeability of coalbed during gas sorption and desorption. These factors affect the distribution of pressure, methane production and CO2 sequestration. This paper compares the effects of cleat compression and matrix shrinkage and swelling models with the injection of different compositional gas mixtures (CO2 and N2). It shows that well performance, pressure distribution and properties of the seam are strongly affected by matrix shrinkage and swelling. Matrix shrinkage and swelling also affects net presen

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12

Kim, Young Chan, Se Weon Choi, and Chang Seog Kang. "Effect of Controlling Process Parameters on Shrinkage Porosity in Aluminum Die-Casting Rotor." Advanced Materials Research 813 (September 2013): 136–43. http://dx.doi.org/10.4028/www.scientific.net/amr.813.136.

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Aluminum rotor prone to have many casting defects especially large amount of gas and shrinkage porosity, which caused eccentricity, loss and noise during motor operation. Many attempts have been made to develop methods of shrinkage porosity control, but still there are some problems to solve. In this research, the process of vacuum squeeze die casting is proposed for limitation of defects. The 6 pin point gated dies which were in capable of local squeeze at the end ring were used. Influences of filling patterns on HPDC were evaluated and the important process control parameters were high injec

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13

Tang, An-Ching, and John S. Boyer. "Leaf shrinkage decreases porosity at low water potentials in sunflower." Functional Plant Biology 34, no. 1 (2007): 24. http://dx.doi.org/10.1071/fp06222.

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Leaves often shrink significantly when soil water is limited. For gas exchange measurmements, the shrinkage can require correction for changing amounts of tissue in the apparatus. In sunflower plants (Helianthus annuus L.), a comparison was made between mathematically-corrected transpiration and clamping leaves at their original turgid size without mathematical correction. These methods should give the same result, but transpiration was substantially greater in the clamped leaves than in the shrunken and mathematically-corrected ones. Because the clamped leaves remained at their original turgi

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14

Bhagavath, Shishira, Zhixuan Gong, Tim Wigger, et al. "Mechanisms of gas and shrinkage porosity formation in solidifying shear bands." Journal of Materials Processing Technology 299 (January 2022): 117338. http://dx.doi.org/10.1016/j.jmatprotec.2021.117338.

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15

Godwal, U., S. Bhagavath, B. Ghaffari, M. Li, P. D. Lee, and S. Karagadde. "Numerical modelling of porosity with combined gas and shrinkage effects in HPDC." IOP Conference Series: Materials Science and Engineering 1274, no. 1 (2023): 012028. http://dx.doi.org/10.1088/1757-899x/1274/1/012028.

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Abstract High-pressure die casting is a manufacturing process in which near-net-shape components are produced rapidly under a pressurized environment. However, due to the relatively higher cooling rate prevailing during the process, isolated liquid pockets form at certain locations, leading to increased porosity formation. A one-dimensional deformable grid numerical model has been developed for predicting the evolution of a single pore in an elementary volume, which combines the diffusion model with the shrinkage affected growth. The model accounts for the change in pore size due to shrinkage

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16

Kucharčík, L., M. Brůna, and A. Sládek. "Influence of Chemical Composition on Porosity in Aluminium Alloys." Archives of Foundry Engineering 14, no. 2 (2014): 5–8. http://dx.doi.org/10.2478/afe-2014-0026.

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Abstract Porosity is one of the major defects in aluminum castings, which results is a decrease of a mechanical properties. Porosity in aluminum alloys is caused by solidification shrinkage and gas segregation. The final amount of porosity in aluminium castings is mostly influenced by several factors, as amount of hydrogen in molten aluminium alloy, cooling rate, melt temperature, mold material, or solidification interval. This article deals with effect of chemical composition on porosity in Al-Si aluminum alloys. For experiment was used Pure aluminum and four alloys: AlSi6Cu4, AlSi7Mg0, 3, Al

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17

Ignaszak, Zenon, and Jakub Hajkowski. "Gas- and Shrinkage Porosities in Al-Si High-Pressure Die-Castings - Virtualization and Experimental Validation." Defect and Diffusion Forum 364 (June 2015): 80–91. http://dx.doi.org/10.4028/www.scientific.net/ddf.364.80.

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The porosity (void caused by technological reasons) in engineering materials always decrease their mechanical characteristics and usually affects the deterioration of the functional mechanical characteristics of the finished products. In the castings the porosity resulting from the specific casting processes phenomena occurs inevitably in the matrix structure. The paper shows this problem in relation to the High-Pressure-Die-Casting (HPDC) technology of Al-Si alloy. The analysis of the experimental results and the results from virtualization of HPDC process allowed to assess the effectiveness

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18

Kaila, Vishal N., and Indravadan B. Dave. "An Investigation into the Effect of Backup Coat Sands on Investment Casting Products." Jurnal Kejuruteraan 34, no. 1 (2022): 109–15. http://dx.doi.org/10.17576/jkukm-2022-34(1)-10.

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Investment casting is a well-known method for producing precise and finished products. The shell-making process takes a long time and consumes a large amount of coating sands. On the wax pattern tree, the ceramic coating sands are used as a primary coat and several backup coats. Zirconia sand is used for primary coating on a shell in this work. Backup coat sands are made up of fused silica and alumina silica. Colloidal silica is used as a binding material in the formation of all shells. In the work, the effect of fused silica and alumina-silica sand as a backup coat on casting properties was d

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19

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.

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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 w

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20

Prasad, Mahesh R. G., Siwen Gao, Napat Vajragupta, and Alexander Hartmaier. "Influence of Trapped Gas on Pore Healing under Hot Isostatic Pressing in Nickel-Base Superalloys." Crystals 10, no. 12 (2020): 1147. http://dx.doi.org/10.3390/cryst10121147.

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Under the typical hot isostatic pressing (HIP) processing conditions, plastic deformation by dislocation slip is considered the primary mechanism for pore shrinkage, according to experimental observations and deformation mechanism maps. In the present work, a crystal plasticity model has been used to investigate the influence of applied pressure and holding time on porosity reduction in a nickel-base single crystal superalloy. The influence of trapped gas on pore shrinkage is modeled by coupling mechanical deformation with pore–gas interaction. In qualitative agreement with experimental invest

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21

Xu, Jiarui, Xiaohui Zhang, and Shan Qing. "Effect of bed shrinkage on iron ore sintering process." AIP Advances 12, no. 6 (2022): 065209. http://dx.doi.org/10.1063/5.0096537.

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There exist complex chemical reactions and phase transition processes—melting and solidification—in the iron ore sintering process. This will result in bed shrinkage and has an important impact on the sintering process and sinter properties. Numerical simulation was carried out in this paper, and it is based on the porous medium and double-energy equation model, coupled with the porosity shrinkage model. The influence of bed shrinkage on the sintering process was explored and revealed by comparing the calculation results, considering and neglecting bed shrinkage. The results indicate that bed

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22

Azim, Reda Abdel, Abdulrahman Aljehani, and Saad Alatefi. "Estimation of Free and Adsorbed Gas Volumes in Shale Gas Reservoirs under a Poro-Elastic Environment." Energies 16, no. 15 (2023): 5798. http://dx.doi.org/10.3390/en16155798.

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Unlike conventional gas reservoirs, fluid flow in shale gas reservoirs is characterized by complex interactions between various factors, such as stress sensitivity, matrix shrinkage, and critical desorption pressure. These factors play a crucial role in determining the behavior and productivity of shale gas reservoirs. Stress sensitivity refers to the stress changes caused by formation pressure decline during production, where the shale gas formation becomes more compressed and its porosity decreases. Matrix shrinkage, on the other hand, refers to the deformation of the shale matrix due to the

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23

Selivyorstov, Vadim, Tatjana Selivyorstova, and Anton Guda. "SYSTEM ANALYSIS OF POROSITY FORMATION PROCESSES IN STEEL CASTINGS AND THEIR MATHEMATICAL MODELS." System technologies 6, no. 125 (2019): 89–104. http://dx.doi.org/10.34185/1562-9945-6-125-2019-09.

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The analysis of scientific and technical information about the hardening features of steel castings, which lead to the formation of shrinkage defects is presented. The mechanisms of the relationship of the casting properties of alloys are shown. The analysis of factors that determine fluidity is carried out. The technological parameters of casting are determined, which lead to the formation of pores in steel castings. The mechanisms of porosity formation of endogenous and exogenous nature are considered. Siverts law is given, that describes the dependence of gas concentration on pressure. Grap

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24

Lee, Soon Gi, and Arun M. Gokhale. "Formation of gas induced shrinkage porosity in Mg-alloy high-pressure die-castings." Scripta Materialia 55, no. 4 (2006): 387–90. http://dx.doi.org/10.1016/j.scriptamat.2006.04.040.

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25

Khalajzadeh, Vahid, Kent D. Carlson, Daniel G. Backman, and Christoph Beckermann. "A Pore-Centric Model for Combined Shrinkage and Gas Porosity in Alloy Solidification." Metallurgical and Materials Transactions A 48, no. 4 (2017): 1797–816. http://dx.doi.org/10.1007/s11661-016-3940-6.

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26

Cabrera-Covarrubias, Francisca, José Gómez-Soberón, Carlos Rosas-Casarez, Jorge Almaral-Sánchez, and Jesús Bernal-Camacho. "Recycled Mortars with Ceramic Aggregates. Pore Network Transmutation and Its Relationship with Physical and Mechanical Properties." Materials 14, no. 6 (2021): 1543. http://dx.doi.org/10.3390/ma14061543.

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The porosity of mortars with recycled ceramic aggregates (10, 20, 30, 50, and 100% as a replacement of natural aggregate) was evaluated and analyzed using three different techniques. The results of gas adsorption (N2), Scanning Electron Microscopy (SEM) image analysis and open porosity allowed establishing the relationship between the recycled aggregate content and the porosity of these mortars, as well as the relationship between porosity and the physical and mechanical properties of the mortars: absorption, density, compressive strength, modulus of elasticity, and drying shrinkage. Using the

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27

Raza, M., M. Irwin, and B. Fagerström. "The Effect of Shell Thickness, Insulation and Casting Temperature on Defects Formation During Investment Casting of Ni-base Turbine Blades." Archives of Foundry Engineering 15, no. 4 (2015): 115–23. http://dx.doi.org/10.1515/afe-2015-0090.

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Abstract Turbine blades have complex geometries with free form surface. Blades have different thickness at the trailing and leading edges as well as sharp bends at the chord-tip shroud junction and sharp fins at the tip shroud. In investment casting of blades, shrinkage at the tip-shroud and cord junction is a common casting problem. Because of high temperature applications, grain structure is also critical in these castings in order to avoid creep. The aim of this work is to evaluate the effect of different process parameters, such as, shell thickness, insulation and casting temperature on sh

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28

Ignaszak, Z., J. Hajkowski, and P. Popielarski. "Examples of New Models Applied in Selected Simulation Systems with Respect to Database." Archives of Foundry Engineering 13, no. 1 (2013): 45–50. http://dx.doi.org/10.2478/afe-2013-0009.

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Abstract The tolerance of damage rule progressively meets the approval in the design casting parts procedures. Therefore, there were appeared the new challenges and expectations for permanent development of process virtualization in the mechanical engineering industry. Virtualization is increasingly developed on the stage of product design and materials technologies optimization. Increasing expectations of design and process engineers regarding the practical effectiveness of applied simulation systems with new proposed up-grades modules is observed. The purpose is to obtain simulation tools al

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29

Zaffarani, P., Q. Zhang, A. E. W. Jarfors, and G. Timelli. "Influence of stirring process during slurry formation on the casting defects and high-temperature fatigue of rheocast AlSi7Mg alloys." IOP Conference Series: Materials Science and Engineering 1274, no. 1 (2023): 012024. http://dx.doi.org/10.1088/1757-899x/1274/1/012024.

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Abstract The effects of the stirring phase during slurry formation on the defect’s content and the influence on the high-temperature fatigue behaviour of a rheocast AlSi7Mg alloy were investigated. Single or double-stir step was used during RheoMetal processing. Metallographic and image analysis techniques were performed to quantitatively examine the defect’s changes occurring with different stirring methods. Samples were cross-sectioned along the gauge length, and the pores content was measured. Uniaxial fatigue tests were performed at high temperature (150 °C) with the staircase method, appl

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30

WEI, ZHIJIE, and DONGXIAO ZHANG. "COUPLED FLUID FLOW AND GEOMECHANICS IN COALBED METHANE RECOVERY STUDY." Modern Physics Letters B 24, no. 13 (2010): 1291–94. http://dx.doi.org/10.1142/s0217984910023451.

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In this paper, we present a coupled fluid flow and geomechanics model for simulating coalbed methane recovery. In the model, the fluid flow process is simulated with a triple porosity/dual permeability representation, and the coupling effects of effective stress and matrix swelling/shrinkage approach are simulated with a coupled fluid flow, geomechanics and gas adsorption/desorption model. The mathematical model is implemented with a fully implicit finite volume method and simulation is conducted to evaluate the effect of coupled fluid flow, geomechanics, and gas adsorption/desorption.

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STROTSKIY, Valeriy, Aleksey KROKHIN, and Vladimir SAVIN. "ACCOUNTING FOR THE INFLUENCE OF HUMIDITY PROPERTIES OF AUTOCLAVE- CURED CELLULAR CONCRETE IN THE DESIGN AND CONSTRUCTION OF ENCLOSING STRUCTURES." Bulletin of Science and Research Center “Stroitelstvo”, no. 3 (30) (August 31, 2021): 88–99. http://dx.doi.org/10.37538/2224-9494-2021-3(30)-88-99.

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The results of studies of porosity, water absorption, moisture shrinkage and frost resistance of cellular concrete, which are some of the main factors determining the durability of cellular concrete enclosing structures manufactured using autoclave hardening technology, are considered. Methods for determining water absorption, moisture shrinkage and frost resistance are presented. The relationship between the moisture shrinkage and the capillary forces (the sum of the surface tension forces on the micromeniscs of liquid in

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32

Soares, Gonçalo, Rui Neto, Rui Madureira, et al. "Characterization of Al Alloys Injected through Vacuum-Assisted HPDC and Influence of T6 Heat Treatment." Metals 13, no. 2 (2023): 389. http://dx.doi.org/10.3390/met13020389.

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AlSi12(Fe), AlSi10Mg(Fe), AlSi10MnMg, and AlMg4Fe2 die-casting alloys were produced by high-pressure die casting (HPDC) and vacuum-assisted high-pressure die casting (VADC) under a vacuum level of 200 mbar. The chemical composition, hardness, gas and shrinkage porosity, and mechanical properties were analyzed. The parts under study were subjected to a T6 heat treatment. The VADC led to a decrease in the percentage of defects in the as-cast state for all the alloys, due to a reduction in the amount of gas porosities. After heat treatment, the quantity of gas and shrinkage porosities increased.

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Yin, Yi Bin, Yon Gan Zhang, Bai Qing Xiong, et al. "Morphologies and Formation Mechanism of Interconnected Pores in a Spray Formed 7XXX Aluminum Alloy." Materials Science Forum 788 (April 2014): 193–200. http://dx.doi.org/10.4028/www.scientific.net/msf.788.193.

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In this paper, Al-Zn-Mg-Cu alloys were produced through spray forming technique. Microstructures of interconnected porosity defects in spray-deposited preforms were characterized by means of field emission scanning electron microscopy (FESEM). The formation mechanisms of different types of interconnected pores were investigated. The densification of deposited alloy preforms with interconnected pores was also analyzed. Interconnected pores in deposited alloys may be classified into four types, interconnected pores between interstices, between gas pores, between interstices and gas pores, and in

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34

Kościuszko, Artur, Mateusz Rojewski, Bartosz Nowinka, and Filip Patalas. "Post-Molding Shrinkage, Structure and Properties of Cellular Injection-Molded Polypropylene." Materials 15, no. 20 (2022): 7079. http://dx.doi.org/10.3390/ma15207079.

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Cellular injection molding is a common method of modifying polymer materials aimed at reducing the sink marks on moldings’ surfaces while reducing their weight. However, the dimensions of polypropylene (PP) samples as well as their mechanical properties after the injection molding process change as a result of re-crystallization. Knowledge of dimensional accuracy and awareness of the change in mechanical properties of products during conditioning are very important aspects in the polymer processing industry. The aim of this study was to assess the changes in the value of processing shrinkage a

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35

Gu, Cheng, Colin D. Ridgeway, Emre Cinkilic, Yan Lu, and Alan A. Luo. "Predicting gas and shrinkage porosity in solidification microstructure: A coupled three-dimensional cellular automaton model." Journal of Materials Science & Technology 49 (July 2020): 91–105. http://dx.doi.org/10.1016/j.jmst.2020.02.028.

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Li, Lei, Guanglong Sheng, and Yuliang Su. "Water-Gas Two-Phase Flow Behavior of Multi-Fractured Horizontal Wells in Shale Gas Reservoirs." Processes 7, no. 10 (2019): 664. http://dx.doi.org/10.3390/pr7100664.

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Hydraulic fracturing is a necessary method to develop shale gas reservoirs effectively and economically. However, the flow behavior in multi-porosity fractured reservoirs is difficult to characterize by conventional methods. In this paper, combined with apparent porosity/permeability model of organic matter, inorganic matter and induced fractures, considering the water film in unstimulated reservoir volume (USRV) region water and bulk water in effectively stimulated reservoir volume (ESRV) region, a multi-media water-gas two-phase flow model was established. The finite difference is used to so

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Bai, Jinyu, Shanlu Yang, Zhe Lin, and Qian Yin. "Laser Joining of CFRTS and Steel by Interfacial Pressure Control." Welding Journal 101, no. 11 (2022): 281–88. http://dx.doi.org/10.29391/2022.101.022.

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The carbon fiber-reinforced polymer (CFRP) metal structure is widely used in various industries to reduce the weight and cost of the structure without compromising performance. The main challenge for manufacturing the CFRP metal structure comes from the lack of flexible and robust joining processes. In this study, a new laser joining process was developed that used a thin layer of polyamide 6 as an interlayer material lying between carbon fiber-reinforced thermosets and a quenching-partition (QP) 980 steel to achieve the joint since the laser can’t directly join the steel to the thermoset comp

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Ogawa, Kazuhiro, and Takahiro Niki. "Repairing of Degraded Hot Section Parts of Gas Turbines by Cold Spraying." Key Engineering Materials 417-418 (October 2009): 545–48. http://dx.doi.org/10.4028/www.scientific.net/kem.417-418.545.

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Hot section parts of combined cycle gas turbines are susceptible to degradation due to high temperature creep, crack formation by thermal stress, and high temperature oxidation, etc. Thus, regularly repairing or replacing the hot section parts such as gas turbine blades is inevitable. For this purpose, revolutionary and advanced repair technologies for gas turbines have been developed to enhance reliability of the repaired parts and reduce the maintenance cost of the gas turbines. The cold spraying process, which has been studied as not only a new coating technology but also as a process for o

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Yang, Long, Yizhong Zhang, Maolin Zhang, and Bin Ju. "A Novel Semianalytical Model for the Relationship between Formation Pressure and Water Saturation in Coalbed Methane Reservoirs." Energies 16, no. 2 (2023): 875. http://dx.doi.org/10.3390/en16020875.

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The accuracy of the relationship between formation pressure and water saturation has a direct impact on predicting the production performance of coal reservoirs. As a result, researchers are becoming more interested in this connection. The most commonly used method to evaluate this connection is the semianalytic method, but it disregards the impact of coal matrix shrinkage on pore compressibility, resulting in inaccurate water saturation estimations for coal reservoirs. A material balance equation that considers the effect of coal matrix shrinkage on cleat porosity and pore compressibility, as

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Jarfors, Anders E. W., Qing Zhang, and Stefan Jonsson. "Feeding and Pore Formation in Semisolid Metal Casting." Metals 10, no. 11 (2020): 1560. http://dx.doi.org/10.3390/met10111560.

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Semisolid casting can provide excellent castings, but the nature of the pore-forming mechanisms has not been properly clarified. In the current communication, it was suggested that hydrogen precipitated during slurry making might have a decisive role in the formation of both gas and shrinkage porosity. Intensive stirring at the end of the slurry making process may act as a degassing step. Without the intense shearing, structures of primary slurry particles form around the hydrogen pores, strongly affecting pore formation and feeding during the intensification stage.

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Anjos, Vitor, Carlos A. Silva Ribeiro, Fátima Dias, Wolfgang Baumgart, and João Cunha. "Literature Survey on Porosity and Microporosity in Cast Irons Related to Expansion and Gas Entrapment Phenomena." Key Engineering Materials 457 (December 2010): 410–15. http://dx.doi.org/10.4028/www.scientific.net/kem.457.410.

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Macro and microporosity in castings are a problem that persists at many foundries, despite the use of advance simulation software’s. This fact indicates that other parameters rather then the casting shape/design or the “standard” metallurgical characteristics are not properly controlled, considered or modelled in the solidification simulation. In this paper we present the Phase I of a research project, which consists on a bibliographic review of the previous attempts to evaluate the relationship between solidification sequence and the measurement of expansion of molten metal during eutectic so

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Wang, Wenkai, Shiqi Liu, Shuxun Sang, Ruibin Du, and Yinghai Liu. "A Study on the Production Simulation of Coal–Shale Interbedded Coal Measure Superimposed Gas Reservoirs under Different Drainage Methods." Processes 11, no. 12 (2023): 3424. http://dx.doi.org/10.3390/pr11123424.

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To study the influence of different drainage methods on the production performance of coal measure gas wells, the interbedded reservoir composed of coal and shale in the Longtan Formation of the Dahebian block was used as the research object. Considering the influence of coal and shale matrix shrinkage, effective stress, and interlayer fluid flow on reservoir properties such as fluid migration behavior and permeability, a fluid–solid coupling mathematical model of coal measure superimposed gas reservoirs was established. Numerical simulations of coal measure gas production under different drai

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Tjiroso, Bambang, Kifli Umar, Sandi Rais, Sahdar Rajak, and Zulfikram -. "Pengaruh Suhu Penuangan Terhadap Kualitas Dan Cacat Coran Aluminium Bekas Kaleng Minuman Dengan Metode Lost Foam Casting." Journal Of Science and Engineering 7, no. 2 (2024): 113–17. https://doi.org/10.33387/josae.v7i2.9322.

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The purpose of this study is to determine the effect of pouring temperature on defect quality in aluminum castings for beverage cans, using the Lost Foam Casting method. The results indicate that pouring temperature significantly influences casting quality. Higher pouring temperatures improve casting quality by increasing fluidity, allowing the molten metal to better fill the mold cavities. Conversely, lower pouring temperatures reduce the aluminum's flowability. Observed defects primarily include cavities or small holes ranging in size from approximately 0.28000 µm to 0.6843 µm, suggesting po

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Hehsan, H., and Roslee Ahmad. "The Effect of Vortex well Thickness on Microstructure and Mechanical Properties of Aluminium LM6." Applied Mechanics and Materials 465-466 (December 2013): 1219–23. http://dx.doi.org/10.4028/www.scientific.net/amm.465-466.1219.

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Gating system in a casting mold consists of a series of channels and reservoirs designed to feed molten metal to all parts of the mold cavity. The design of the system is the principle means by which the mold designer can control the rate of the metal flow and promote the desirable temperature distribution of cooling that will take place within the filled cavity. This research was conducted to determine the effects of vortex well thickness on the microstructure and mechanical properties of Aluminium LM6 in sand casting process. The experimental results show that increasing the vortex well thic

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Ignaszak, Zenon, Paweł Popielarski, Jakub Hajkowski, and J. B. Prunier. "Problem of Acceptability of Internal Porosity in Semi-Finished Cast Product as New Trend "Tolerance of Damage" Present in Modern Design Office." Defect and Diffusion Forum 326-328 (April 2012): 612–19. http://dx.doi.org/10.4028/www.scientific.net/ddf.326-328.612.

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Discontinuities in cast products, obtained from a liquid state of an alloy, are the result of phenomena occurring during multiphase system crystallization. On the one hand, compacted defects as a shrinkage pipe are relatively easy to eliminate. On the other hand, it is known that presence of fine shrinkage and gas porosity is unavoidable. Detectability of these dispersed discontinuities depends on type of inspection method applied. Structure, including intensity and location of porosity zones, is dependent on the type of the alloy, casting configuration and conception of technological solution

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Prihtiantoro, Dedhy, Agus Dwi Anggono, and Waluyo Adi Siswanto. "Defect Investigation of Sand Casted Aluminum Cooling Fan." Materials Science Forum 991 (May 2020): 30–36. http://dx.doi.org/10.4028/www.scientific.net/msf.991.30.

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Sand casting is one of manufacturing process that still exist today. Numerous products are produced to serve industrial and domestic use. Defect could lead to product performance, and unfortunately inevitable in a casting process. This paper aim to investigate typical defect resulted from sand casting process. An aluminum cooling fan was selected as the model since it has complicated shape with different thicknesses. The casted fan was investigated under photo micro for defect analysis. Porosity, gas inclusion, pinhole, and shrinkage were found as the common defects occured at different part o

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Liu, Zhenli, Xinhua Yan, Lei Yuan, and Jingkun Yu. "Study on the Effect of Binders on the Properties of Mullite Porous Ceramics for Flue Gas Filtration." E3S Web of Conferences 406 (2023): 01029. http://dx.doi.org/10.1051/e3sconf/202340601029.

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Fused mullite particles are used to prepare mullite porous ceramics by gel-casting method, using polysilicon waste and ρ-Al2O3 powder as the binder, and starch as the pore forming agent. The content of the pore forming agent was 20%, and the ratio of the mass of fused mullite particles to the mass of the binder was 9:1, 8:2, 7:3, and 6:4, respectively. The effects of binder content on the properties of mullite ceramics in terms of phase composition, microstructure, apparent porosity, compressive strength, bulk density, pore size distribution, and filtration pressure drop were investigated. It

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Choudhari, C. M., K. J. Padalkar, K. K. Dhumal, B. E. Narkhede, and S. K. Mahajan. "Defect Free Casting by Using Simulation Software." Applied Mechanics and Materials 313-314 (March 2013): 1130–34. http://dx.doi.org/10.4028/www.scientific.net/amm.313-314.1130.

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The use of Aluminum castings parts in the automotive industry has increased dramatically over the past few decades. The driving force for this increased use is vehicle weight reduction for improved performance. In many cases the mechanical properties of the cast aluminum parts are superior to those of the cast iron or wrought steel parts being used.This paper proposes the computer simulation of the sand casting of Aluminum Plate. It aims to study the behavior of fluid flow during mould filling and solidification and to optimize the process parameters, which help to predict and control casting

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Wang, Guangxin, Jinqing Wang, Jie Wang, et al. "A Sinter Visualization Device for Observing the Relationship Between Fillers and Porosity of Precursor-Derived Ceramic Coatings." Coatings 10, no. 6 (2020): 552. http://dx.doi.org/10.3390/coatings10060552.

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Adding fillers to polysilazane (PSZ)-derived ceramic coating is one of the main methods used to reduce PSZ porosity. In this study, we designed a sinter visualization device for understanding the effect of fillers on coating porosity and observed pore evolution within the coating sintering process using different filler ratios. When there was no filler in the coating, gas evolution occurred at the initial sintering stage due to a PSZ pyrolysis reaction. In the final stage, numerous cracks appeared because of volume shrinkage. It was determined that such coatings cannot provide good protection.

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Yeranee, Kirttayoth, and Yu Rao. "A Review of Recent Research on Flow and Heat Transfer Analysis in Additively Manufactured Transpiration Cooling for Gas Turbines." Energies 18, no. 13 (2025): 3282. https://doi.org/10.3390/en18133282.

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Advanced gas turbine cooling technologies are required to bridge the gap between turbine inlet temperatures and component thermal limits. Transpiration cooling has emerged as a promising method, leveraging porous structures to enhance cooling effectiveness. Recent advancements in additive manufacturing (AM) enable precise fabrication of complex transpiration cooling architectures, such as triply periodic minimal surface (TPMS) and biomimetic designs. This review analyzes AM-enabled transpiration cooling for gas turbines, elucidating key parameters, heat transfer mechanisms, and flow characteri

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