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Relevant bibliographies by topics / Gas shrinkage porosity

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Academic literature on the topic 'Gas shrinkage porosity'

Author: Grafiati

Published: 30 May 2022

Last updated: 31 July 2025

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Journal articles on the topic "Gas shrinkage porosity"

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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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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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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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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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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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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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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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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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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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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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Dissertations / Theses on the topic "Gas shrinkage porosity"

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O'Brien, Evan Daniel. "Welding with Low Alloy Steel Filler Metal of X65 Pipes Internally Clad with Alloy 625: Application in Pre-Salt Oil Extraction." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1469018389.

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Абдулкеримов, Илимдар Диляверович. "Технологическое обеспечение качества резьбовых соединений в глухих отверстиях деталей из алюминиевых сплавов деформирующим инструментом". Thesis, НТУ "ХПІ", 2015. http://repository.kpi.kharkov.ua/handle/KhPI-Press/20297.

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Диссертация на соискание учёной степени кандидата технических наук по специальности 05.02.08 – технология машиностроения. Национальный технический университет "Харьковский политехнический институт", Харьков, 2016. Диссертация посвящена решению научно-технической задачи технологического обеспечения герметичности резьбовых соединений деталей из алюминиевых сплавов с газо-усадочной пористостью деформирующим инструментом. В работе проведен анализ существующих систем обработки глухих отверстий в алюминиевых сплавах из газо-усадочных материалов, выявлены основные факторы, определяющие качество и пр

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Абдулкерімов, Ілімдар Діляверович. "Технологічне забезпечення якості різьбових з'єднань у глухих отворах деталей з алюмінієвих сплавів деформуючим інструментом". Thesis, НТУ "ХПІ", 2016. http://repository.kpi.kharkov.ua/handle/KhPI-Press/20295.

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Дисертація на здобуття наукового ступеня кандидата технічних наук за спеціальністю 05.02.08 – технологія машинобудування. Національний технічний університет "Харківський політехнічний інститут", Харків, 2016. Дисертація присвячена вирішенню проблеми технологічного забезпечення герметичності різьбових з'єднань деталей з алюмінієвих сплавів з газо-усадковою пористістю деформуючим інструментом. У роботі проведено аналіз існуючих систем обробки глухих отворів у деталях з газо-усадкових матеріалів. Проведено аналітичне та експериментальне дослідження методу механічної обробки різьбових отворів при

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Zhang, Yao. "Comportement hydrique et poro-mécanique des bétons à hautes performances Andra : influence de la microstructure." Thesis, Ecole centrale de Lille, 2014. http://www.theses.fr/2014ECLI0009/document.

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Cette thèse étudie la rétention d’eau à haute HR et le retrait sous température modérée des bétons CEMI et CEMV de l’Andra, en lien avec leur microstructure.Pour étudier l’origine des variations de Sw à haute HR, du béton est séché à HR= 92-100%. Pour les deux bétons, l’échantillonnage influe significativement sur Sw. Pour le CEMI, à HR=100%, la taille joue aussi, en lien avec un mécanisme de séchage par désorption de surface ; à HR=92&98%, ce béton n’est plus sensible aux effets de surface ; il est sensible aux conditions expérimentales. Pour le CEMV, l’effet de la taille existe quelle qu

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Book chapters on the topic "Gas shrinkage porosity"

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Kostin, I., A. Sidorov, S. Belyaev, et al. "Reducing Gas Shrinkage Porosity in Al–Mg Alloy Slabs." In The Minerals, Metals & Materials Series. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-65396-5_121.

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Lee, Soon Gi, and Arun M. Gokhale. "Phenomena of Formation of Gas Induced Shrinkage Porosity in Pressure Die-Cast Mg-Alloys." In Essential Readings in Magnesium Technology. Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-48099-2_35.

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Lee, Soon Gi, and Arun M. Gokhale. "Phenomena of Formation of Gas Induced Shrinkage Porosity in Pressure Die-Cast Mg-Alloys." In Essential Readings in Magnesium Technology. John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9781118859803.ch35.

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Balasundaram, A., and A. M. Gokhale. "Digital Image Analysis Technique for Characterization of Shrinkage and Gas (Air) Porosity in Cast Magnesium Alloys." In Magnesium Technology 2001. John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118805497.ch28.

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Tan, Yuxiang, Weizhuo Shi, Bo Li, and Yung-Tsang Chen. "Effects of Superabsorbent Polymers and Natural Zeolite on the Properties and Pore Structure of Ultra-High-Performance Concretes." In Lecture Notes in Civil Engineering. Springer Nature Switzerland, 2025. https://doi.org/10.1007/978-3-031-69626-8_28.

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AbstractUltra-high-performance concrete (UHPC) often faces challenges due to its low water-to-binder ratio. In this case, cement particles will be unable to fully hydrate, resulting in a high degree of initial dimensional instability. As a promising solution, superabsorbent polymers (SAP) and natural zeolite have potential in mitigating shrinkage and achieving self-stressing properties. Despite prior research on strength, shrinkage, and hydration of UHPC, no systematic study has examined the effects of SAP and natural zeolite on porosity and pore structure. To address this gap, a holistic test

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"Shrinkage Porosity and Gas Porosity." In Casting. ASM International, 2008. http://dx.doi.org/10.31399/asm.hb.v15.a0005222.

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Campbell, John. "Defects in Aluminum Alloy Castings." In Encyclopedia of Aluminum and Its Alloys. CRC Press, 2019. http://dx.doi.org/10.1201/9781351045636-140000253.

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Most of the major defects in Al alloy castings are the result of entrainment processes. The entrainment of the surface of the liquid creates bifilm defects, and the entrainment of air creates bubbles and bubble trails. Occasionally the entrainment of foreign inclusions, such as sand inclusions, can also be a problem. Bifilms form the initiators of gas porosity, shrinkage porosity, hot tears, and cracks. Since bifilms can be controlled by improved melting and casting techniques, all these defects are controllable. In addition, bifilms control the mechanical properties of castings, particularly

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Dispinar, Derya. "Melt Quality Assessment." In Encyclopedia of Aluminum and Its Alloys. CRC Press, 2019. http://dx.doi.org/10.1201/9781351045636-120052503.

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It is well known that the reaction of liquid aluminum with the moisture in the environment results in two products: aluminum oxide and hydrogen gas that dissolves in aluminum. Both of these products are considered to be detrimental to the properties of aluminum alloys. Therefore, test equipment has been developed to check the levels of these defects in the melt. Many of these involve expensive and consumable tools. In addition, an experienced personnel may be required to interpret the results. Nonetheless, aluminum oxide is harmless as long as it remains on the surface. The problem begins when

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Samuel, Ehab, Agnes M. Samuel, Victor Songmene, and Fawzy H. Samuel. "Effect of Casting Processes, Rare Earth Metals, and Sr Addition on Porosity Formation in Al-Si Cast Alloys." In Recent Advancements in Aluminum Alloys [Working Title]. IntechOpen, 2023. http://dx.doi.org/10.5772/intechopen.112985.

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The present work was carried out on A413.1cast alloy that was characterized by short freezing temperature range. Measured amounts of high purity (99.99%) rare earth metals (Ce, La, La + Ce) were added to the non-modified and Sr-modified molten metal. Three casting molds were used viz., graphite mold heated at 600°C for the purpose of obtaining solidification curves, metallic mold with three variable opening angles heated at 350°C, and a step-like metallic mold heated at 200 and 400°C. The main results are earth metals (RE) would lead to porosity formation in all molds with increase in its perc

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Conference papers on the topic "Gas shrinkage porosity"

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Shenefelt, Jeffrey R., Rogelio Luck, John T. Berry, and Robert P. Taylor. "Solidification Modeling and Porosity Control in Aluminum Alloy Castings." In ASME 1999 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/imece1999-0710.

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Abstract Commercial software packages enable the thermal environment of shaped castings to be determined provided the boundary conditions are well understood. Criteria functions (CF’s) based on the thermal environment provide a means for estimating shrinkage porosity within a casting. However, the CF’s do not account for gas driven porosity forming within the casting. This paper reviews the CF’s and additional approaches to account for hydrogen evolution in aluminum-copper and aluminum-silicon alloys.

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Bertoletti, Levy. "Optimization of the manufacturing process to minimize porosity in a CW614N brass sealing cap." In Material Forming. Materials Research Forum LLC, 2025. https://doi.org/10.21741/9781644903599-87.

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Abstract. Porosity easily forms during the manufacturing process of the CW614N alloy, a leaded brass widely used in engineering applications. These porosity issues, often undetected until components are in use, can arise during the casting phase due to gas entrapment or shrinkage cavities, or during extrusion as a consequence of suboptimal parameters, such as temperature and speed. An example of this type of defect was found in a sealing cap made of CW614N brass that failed in an industrial machine, causing a dangerous butane gas leakage at room temperature under atmospheric pressure. Chemical

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Lim, C. S., N. P. Hung, Y. C. Tan, and N. L. Loh. "Creep Behaviour of Hot Isostatically Pressed Metal-Matrix Composite." In ASME 1996 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1996. http://dx.doi.org/10.1115/imece1996-0496.

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Abstract Castings usually contain defects such as shrinkage cavities and internal gas porosity. The application of hot isostatic pressing (HIPping) to cast metals can remove such defects through the synergistic effect of high isostatic pressure and high temperature. This paper investigates the effects of HIPping on creep of cast A359/SiC/20p composite. Although creep life was expected to improve due to removal of internal porosity in the castings, the creep results were contrary to expectations. Activation energy calculated for the cast composite, showed a decrease in activation energy for the

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Chen, H., M. Li, Y. Zhang, C. Liu, and Y. Li. "Productivity Prediction of Coalbed Methane Considering the Permeability Changes in Coal." In SPE Energy Resources Conference. SPE, 2014. http://dx.doi.org/10.2118/spe-169922-ms.

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AbstractThis paper describes a three-dimensional numerical model for predicting the coalbed methane (CBM) production. The model describes single phase gas desorption from coal matrix, diffusion to the fracture and two-phase flow of gas and water in the natural fracture system as well as the permeability changes in coal which result from effective stress changes and matrix shrinkage due to gas desorption. The model was discretized by a finite difference method. The implicit pressure-explicit saturation (IMPES) method was used to solve the two-phase flow equations and gas desorption equation was

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Shipley, James, Chad Beamer, and Johannes Gårdstam. "Recent Developments in The Use of Hip for The Offshore Industry." In Offshore Technology Conference. OTC, 2021. http://dx.doi.org/10.4043/31252-ms.

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Abstract The use of additive manufacturing (AM) technology is growing rapidly for offshore use, whilst established production technologies such as powder metallurgy near-net-shape (PM-NNS) continue to be used. New standards are being introduced and many of the oil and gas majors are now developing supply chains to ensure rapid supply of high-quality complex parts. Environmental concerns are helping to drive this with use of near-net-shape technologies to reduce carbon dioxide emissions through more efficient designs and metal forming methods. Hot isostatic pressing (HIP) has been used to remov

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Moeini Sedeh, Mahmoud, and J. M. Khodadadi. "Effect of Marangoni Convection on Solidification of Phase Change Materials Infiltrated in Porous Media in Presence of Voids." In ASME 2013 Heat Transfer Summer Conference collocated with the ASME 2013 7th International Conference on Energy Sustainability and the ASME 2013 11th International Conference on Fuel Cell Science, Engineering and Technology. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/ht2013-17316.

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Void formation is encountered in the form of air pockets during preparation of composite thermal energy storage systems, consisting of phase change materials (PCM) infiltrated into a high-conductivity porous structure. The presence of voids within the pores of a porous structure degrades the thermal and phase change behavior of such composites. Recent work devoted to multiphase modeling of the infiltration of PCM in liquid state into porous media and formation of voids showed that among the various contributing driving forces (i.e. gravity, pressure gradient and interfacial forces), the interf

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Denduluri, Veerabhadra S., George Ulerio II, Moneeb Genedy, Maria Juenger, and Eric van Oort. "Experimental Investigation of Geopolymers for Application in High-Temperature and Geothermal Well Cementing." In SPE/IADC International Drilling Conference and Exhibition. SPE, 2023. http://dx.doi.org/10.2118/212491-ms.

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Abstract With recurrent calls for a reduction in carbon emissions, geothermal energy has received increasing attention in recent years as a prominent source of clean energy. With current drilling technology, geothermal wells are being constructed in extremely challenging temperature environments, which could reach up to 600°F/315°C in-situ temperature and beyond. However, geothermal well-cementing technology has not changed much over the past few decades, with Ordinary Portland Cement (OPC) still being the primary choice of cementing material. OPC has several drawbacks such as brittle behavior

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NIETO, ZACKERY, LISA RUESCHHOFF, ZLATOMIR APOSTOLOV, and ALEJANDRA CASTELLANOS. "PROCESS MODELING OF THE FIRST PYROLYSIS CYCLE OF SMP-10 CERAMIC MATRIX COMPOSITES." In Proceedings for the American Society for Composites-Thirty Eighth Technical Conference. Destech Publications, Inc., 2023. http://dx.doi.org/10.12783/asc38/36677.

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Ceramic matrix composites (CMCs) are widely used in high-temperature applications like hypersonic thermal protection systems. The polymer infiltration and pyrolysis (PIP) process is commonly employed to manufacture CMCs. The PIP process consists of repeated cycles of preceramic polymer infiltration and pyrolysis to progressively increase the density of CMCs. However, it presents challenges such as gas evolution, shrinkage of the preceramic polymer (PCP), and the formation of cracks, porosity, and internal stresses during pyrolysis. Detecting these defects is difficult, and they can lead to int

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Sricharoenchaikul, Viboon, and Duangduen Atong. "Thermal Conversion Characteristic of Pelletized Jatropha Residue and Glycerol Waste." In ASME 2009 3rd International Conference on Energy Sustainability collocated with the Heat Transfer and InterPACK09 Conferences. ASMEDC, 2009. http://dx.doi.org/10.1115/es2009-90223.

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Adverse environmental effects resulting from fossil fuel usage as well as foreseeable conventional energy depletion lead to the exploration of alternative fuel materials especially the renewable ones. In this work, characterization of synthetic fuel material formed by pelletization of Jatropha residue (physic nut) using glycerol waste as a binder was carried out in order to investigate the feasibility of utilizing these waste materials as another renewable energy source. Both wastes are by products from biodiesel manufacturing process. Synthetic fuel materials of Jatropha residue mixed with 0–

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Zunjarrao, Suraj C., Abhishek K. Singh, and Raman P. Singh. "Structure-Property Relationships in Polymer Derived Amorphous/Nano-Crystalline Silicon Carbide for Nuclear Applications." In 14th International Conference on Nuclear Engineering. ASMEDC, 2006. http://dx.doi.org/10.1115/icone14-89515.

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Silicon carbide (SiC) is a promising candidate for several applications in nuclear reactors owing to its high thermal conductivity, high melting temperature, good chemical stability, and resistance to swelling under heavy ion bombardment. However, fabricating SiC by traditional powder processing route generally requires very high temperatures for pressureless sintering. Polymer derived ceramic materials offer unique advantages such as ability to fabricate net shaped components, incorporate reinforcements and relatively low processing temperatures. Furthermore, for SiC based ceramics fabricated

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