Relevant bibliographies by topics / Post-HIPing

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Post-HIPing'

Author: Grafiati
Published: 4 June 2021
Last updated: 9 February 2022

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Journal articles on the topic "Post-HIPing"

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Goel, Sneha, Enrico Zaninelli, Johannes Gårdstam, Uta Klement, and Shrikant Joshi. "Microstructure evolution-based design of thermal post-treatments for EBM-built Alloy 718." Journal of Materials Science 56, no. 8 (December 10, 2020): 5250–68. http://dx.doi.org/10.1007/s10853-020-05595-2.

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Abstract Alloy 718 samples were fabricated by electron beam melting (EBM) additive manufacturing process. The work focused on systematic investigation of response of the material to various thermal post-treatments, involving hot isostatic pressing (HIPing), solution treatment (ST) and two-step aging, to tailor post-treatment procedure for EBM-built Alloy 718. Results showed that HIPing at lowered temperature can be used for attaining desired defect closure while preserving grain size. Subjecting the material to ST, with or without prior HIPing, mainly caused precipitation of δ phase at the grain boundaries with prior HIPing decreasing the extent of δ phase precipitation. Moreover, results suggest that the utility of ST, with prior HIPing, could be dictated by the need to achieve a certain δ phase content, as the typically targeted homogenization after ST had already been achieved through HIPing. Detailed investigation of microstructural evolution during subsequent aging with and without prior HIPing showed that a significantly shortened aging treatment (‘4 + 1’ h), compared to the ‘standard’ long treatment (‘8 + 8’ h) traditionally developed for conventionally produced Alloy 718, might be realizable. These results can have significant techno-economic implications in designing tailored post-treatments for EBM-built Alloy 718. Graphical abstract
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UKYO, Yoshio, Toshio KANDORI, and Shigetaka WADA. "Si3N4-SiC Composite Consolidated by Post-HIPing Process." Journal of the Ceramic Society of Japan 101, no. 1180 (1993): 1430–31. http://dx.doi.org/10.2109/jcersj.101.1430.

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Zafer, Yunus Emre, Sneha Goel, Ashish Ganvir, Anton Jansson, and Shrikant Joshi. "Encapsulation of Electron Beam Melting Produced Alloy 718 to Reduce Surface Connected Defects by Hot Isostatic Pressing." Materials 13, no. 5 (March 9, 2020): 1226. http://dx.doi.org/10.3390/ma13051226.

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Defects in electron beam melting (EBM) manufactured Alloy 718 are inevitable to some extent, and are of concern as they can degrade mechanical properties of the material. Therefore, EBM-manufactured Alloy 718 is typically subjected to post-treatment to improve the properties of the as-built material. Although hot isostatic pressing (HIPing) is usually employed to close the defects, it is widely known that HIPing cannot close open-to-surface defects. Therefore, in this work, a hypothesis is formulated that if the surface of the EBM-manufactured specimen is suitably coated to encapsulate the EBM-manufactured specimen, then HIPing can be effective in healing such surface-connected defects. The EBM-manufactured Alloy 718 specimens were coated by high-velocity air fuel (HVAF) spraying using Alloy 718 powder prior to HIPing to evaluate the above approach. X-ray computed tomography (XCT) analysis of the defects in the same coated sample before and after HIPing showed that some of the defects connected to the EBM specimen surface were effectively encapsulated by the coating, as they were closed after HIPing. However, some of these surface-connected defects were retained. The reason for such remnant defects is attributed to the presence of interconnected pathways between the ambient and the original as-built surface of the EBM specimen, as the specimens were not coated on all sides. These pathways were also exaggerated by the high surface roughness of the EBM material and could have provided an additional path for argon infiltration, apart from the uncoated sides, thereby hindering complete densification of the specimen during HIPing.
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Goel, Sneha, Kévin Bourreau, Jonas Olsson, Uta Klement, and Shrikant Joshi. "Can Appropriate Thermal Post-Treatment Make Defect Content in as-Built Electron Beam Additively Manufactured Alloy 718 Irrelevant?" Materials 13, no. 3 (January 23, 2020): 536. http://dx.doi.org/10.3390/ma13030536.

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Electron beam melting (EBM) is gaining rapid popularity for production of complex customized parts. For strategic applications involving materials like superalloys (e.g., Alloy 718), post-treatments including hot isostatic pressing (HIPing) to eliminate defects, and solutionizing and aging to achieve the desired phase constitution are often practiced. The present study specifically explores the ability of the combination of the above post-treatments to render the as-built defect content in EBM Alloy 718 irrelevant. Results show that HIPing can reduce defect content from as high as 17% in as-built samples (intentionally generated employing increased processing speeds in this illustrative proof-of-concept study) to <0.3%, with the small amount of remnant defects being mainly associated with oxide inclusions. The subsequent solution and aging treatments are also found to yield virtually identical phase distribution and hardness values in samples with vastly varying as-built defect contents. This can have considerable implications in contributing to minimizing elaborate process optimization efforts as well as slightly enhancing production speeds to promote industrialization of EBM for applications that demand the above post-treatments.
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Plucknett, Kevin P., and David S. Wilkinson. "Microstructural characterization of a microwave-sintered silicon nitride based ceramic." Journal of Materials Research 10, no. 6 (June 1995): 1387–96. http://dx.doi.org/10.1557/jmr.1995.1387.

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The microstructure of a microwave-densified silicon nitride based ceramic has been assessed in the as-sintered, post-sinter hot-isostatically pressed (HIPed) and annealed conditions. The grain size of the as-sintered material, which is a low substitution β′-Sialon, was significantly finer than observed in conventionally processed materials of similar composition. The as-sintered ceramic exhibits a reverse porosity gradient (with the highest porosity level at the surface) due to heat dissipation to the cooler surroundings during microwave processing. This also results in a higher β′ aspect ratio close to the surface arising from an increased glass viscosity (due to heat loss) and compositional change in this region during sintering. HIPing results in removal of all porosity from the sample core; however, a reduced porosity surface layer is retained. Significant β′-Sialon grain growth is also apparent after HIPing. A fine β′ grain structure was retained after annealing, with partial devitrification of the glassy grain boundary phase to β-Y2Si2O7.
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Qi, Long Hao, Jian Shen, and Wei Pan. "The Influence of Sintering Process on the Microstructure of Submicron Alumina Fabricated by Gelcasting." Key Engineering Materials 336-338 (April 2007): 1185–87. http://dx.doi.org/10.4028/www.scientific.net/kem.336-338.1185.

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Using ultra-fine alumina powders as raw materials, the submicron transparent alumina with relative density more than 99.9% was fabricated by gelcasting and then sintering-HIP process. It was found that only the samples with relative density more than 95% after presintering could obtain fully densification by post-HIP treatment. The final grain sizes increased after post-HIP treatment and were decided by either HIPing temperature or presintering temperature, depending on which one is higher. The maximal strength can reach about 650MPa when grain size is about 1 μm.
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Ding, Zh, R. Oberacker, H. Frei, and F. Thümmler. "Consolidation of Y-TZP/SiC particulate composites by sintering and containerless post-HIPing." Journal of the European Ceramic Society 10, no. 3 (January 1992): 255–61. http://dx.doi.org/10.1016/0955-2219(92)90039-g.

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YANG, Jian-Feng, Yong-Ho CHOA, Jitendra P. SINGH, and Koichi NIIHARA. "Fabrication and Mechanical Properties of Si3N4/SiC Nanocomposite with Pressureless Sintering and Sinter-Post-HIPing." Journal of the Ceramic Society of Japan 106, no. 1238 (1998): 951–57. http://dx.doi.org/10.2109/jcersj.106.951.

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Ertuğrul, Onur, Zafer Çağatay Öter, Mustafa Safa Yılmaz, Ezgi Şahin, Mert Coşkun, Gürkan Tarakçı, and Ebubekir Koç. "Effect of HIP process and subsequent heat treatment on microstructure and mechanical properties of direct metal laser sintered AlSi10Mg alloy." Rapid Prototyping Journal 26, no. 8 (June 26, 2020): 1421–34. http://dx.doi.org/10.1108/rpj-07-2019-0180.

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Purpose The purpose of this paper is to evaluate the effect of post process combinations, e.g. hot isostatic pressing (HIP) only, HIP + T6 heat treatments, and T6 only, with different aging time, on surface properties, microstructure and mechanical properties of stress-relieved AlSi10Mg parts produced by direct laser metal sintering. Design/methodology/approach HIP process and HIP + T6 heat treatments were applied to as stress-relieved direct laser metal sintered (DMLS) AlSi10Mg parts. Aging times of 4 and 12 h are selected to examine the optimum duration. To analyze the advantages of HIP process, a T6 heat treatment with 4 h of aging was also applied. Densities, open porosities and roughness values of as stress-relieved, HIPed, HIP + T6, and T6-only samples were measured. The samples were characterized by OM and SEM together with EDX analysis. An image analysis study was made to evaluate the inner pore structure, thereby to understand the mechanical behavior. Findings HIP process does not cause a significant change in surface porosity; yet it has a positive influence on inner porosity. HIP process results in a microstructure of the aluminum matrix surrounded by a network of micron and nano size Si particles. Additional heat treatment results in larger particles and precipitation. After HIPing, ductility increases but strength decreases. Samples aged 4 h present improved yield and tensile strength but decreased elongation, yet samples aged for 12 h reach a combination of optimum strength and ductility. The lower level of tensile strength and ductility in T6-only condition indicates that HIP process plays a crucial role in elimination of the porosity thus improves the effectiveness of subsequent heat treatment. Originality/value The study investigates the effect of post-process conditions and optimizes the aging time of the T6 heat treatment after HIP process in order to obtain improved mechanical properties. The stress-relieved state was chosen as the reference to prevent distortion during HIPing or heat treatment.
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Vityaz, P. A., A. F. Ilyuschenko, and V. V. Savich. "Powder metallurgy in Belarus and global development trends." Izvestiya Vuzov. Poroshkovaya Metallurgiya i Funktsional’nye Pokrytiya (Universitiesʹ Proceedings. Powder Metallurgy аnd Functional Coatings), no. 1 (March 21, 2019): 98–106. http://dx.doi.org/10.17073/1997-308x-2019-1-98-106.

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The analysis of trends and prospects for the development of the industry on the materials of European and world congresses of powder metallurgy, publications in leading specialized foreign publications was carried out. The steady growth of the production of powder construction parts for the automotive industry, including using assembly technology during joint sintering, are noted in the developed countries. The production using MIM methods is constantly growing; micro MIM technology has emerged as a separate sub-industry, which allows manufacturing products with a mass of 0,1 g or less. HIP methods found its second wind: with them it became possible to obtain large-sized blanks from corrosion-resistant steels weighing up to 1000 kg, titanium and high-temperature alloys; the post HIPing technology is widely used to improve the quality of products obtained by additive technologies and important castings. With additive technologies, products weighing up to 100 kg are already being manufactured. The authors also formulated their own opinion about the prospects for the development of powder metallurgy in Europe and in the world, determined the development directions of the industry in Belarus and its influence on the development of world powder metallurgy. In particular, new grades of economically alloyed powder steels are developed. They make it possible to reduce the cost of mass structural parts without prejudice to their technical characteristics. For the same purpose, processes combined with hardening of sintering are optimized, and, in contrast to foreign analogues, endogas is used for cooling instead of nitrogen.
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Dissertations / Theses on the topic "Post-HIPing"

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Spusta, Tomáš. "Využití teoretických a exp. přístupů ke slinování pro získání optimální mikrostruktury a vlastností pokročilých keramických materiálů." Doctoral thesis, Vysoké učení technické v Brně. CEITEC VUT, 2020. http://www.nusl.cz/ntk/nusl-414156.

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Táto práca sa zaoberá prispôsobením (tailoring) mikroštruktúry vybraných pokročilých keramických materiálov (oxid hlinitý, kubický a tetragonálny oxid zirkoničitý) metódou izostatického lisovania za tepla (post-HIPing) s cieľom pripraviť vzorky s teoretickou hustotou and minimálnou veľkosťou zŕn. Vzhľadom na to, že izostatické lisovanie je vo väčšine prípadov používané ako dokončovacia metóda, pred-slinovanie (príprava vzoriek v štádiu uzavretej pórovitosti) bolo tiež dopodrobna študované. Extenzívny teoretický a experimentálny výskum pred-sintrovania pokročilých keramických materiálov ukázal niekoľko výsledkov. Bolo zistené, že uzatváranie pórov je materiálová charakteristika riadená medzi-povrchovými energiami (uzatváranie pórov nastáva pri 92-96 % t.d. pre skúmané materiály), je nezávislé na technológii prípravy keramického polotovaru a je nezávislé na histórii sintrovacieho procesu. Pre analýzu mikroštruktúry skenovacím elektrónovým mikroskopom a výrazné zvýšenie efektivity mikroštruktúrnej analýzy, bola vyvinutá nízkoteplotná metóda termálneho leptania. Táto metóda umožňuje zviditeľnenie leštenej mikroštruktúry pri leptacej teplote 900 °C a výdrži 1 hodina čiastočne sintrovaných a plne hutných vzoriek bez teplotnej kontaminácie (zvýšenie hustoty a veľkosti zŕn). Pred-sintrované vzorky boli post-HIPované nadizajnovaným kombináciami teploty (1200-1400 °C), aplikovaného tlaku (50 a 200 MPa) a času výdrže (0,5 až 9 hodín) s cieľom štúdia vplyvu týchto post-HIPovacích parametrov na mikroštruktúru vzoriek. Najdôležitejší výsledok experimentov je, že aplikovaný tlak vykazuje iba minimálny vplyv na rast zŕn v priebehu post-HIPovania, pričom výrazne posilňuje zhutňovanie. Sintrovacia teplota a čas výdrže tiež vykazovali zhutňovací potenciál, avšak s negatívnym efektom na veľkosť zŕn počas post-HIPovania rešpektujúc kinetickú rovnicu rastu zŕn – exponenciálny rast pre teplotu a parabolický rast pre čas. Tieto výsledky boli použité pre optimalizáciu post-HIPovacích cyklov pre študované materiály. Výsledné vzorky boli zhutnené nad 99,7 % t.d. a s minimálnym (pod 10 %) nárastom veľkosti zŕn v porovnaní s pred-sintrovanou veľkosťou zŕn. Aplikáciou získaných znalostí bola pripravená transparentná korundová keramika dopovaná erbiom s fotoluminiscenčnými vlastnosťami. Pripravená vzorka s tvrdosťou HV 10 26,9 GPa a so skutočnou inline priepustnosťou RIT 56 % vykazuje najlepšie hodnoty tvrdosti a priepustnosti v doposiaľ publikovaných korundových keramických materiáloch dopovaných prvkami vzácnych zemín.
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Spusta, Tomáš. "Studium přechodu ze stadia otevřené do stadia uzavřené pórovitosti při slinování pokročilých keramických materiálů." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-231760.

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Lisovanie za tepla (HIP) je pokročilá technológia pre výrobu plne hutných keramických materiálov, ktoré majú množstvo štruktúrnych (napr. rezné nástroje), biologických (napr. implantáty hutných kostí a kĺbov) alebo funkčných (napr. transparentné štíty a okná) aplikácií. Pre úspešné použitie tejto technológie je potrebné, aby predspekané vzorky boli plynotesné, teda bez otvorených pórov. Výskum zaoberajúci sa premenou otvorených pórov na uzatvorené je preto veľmi dôležitý, avšak iba málo publikovaný v odbornej literatúre. Preto bolo experimentálne a teoretické štúdium tohto javu hlavným cieľom diplomovej práce. Analýzy teoretických modelov ukazujú, že transformácia z otvorenej na uzatvorenú pórovitosť je materiálová charakteristika, ktoré sa mení iba s dihedrálnym uhlom, nezávisle na veľkosti častíc prášku alebo na spôsobe tvarovania a nastáva od 92.6% t.d. do 93.7% t.d pre daný materiál (oxid hlinitý, oxid zirkoničitý a horečnato-hlinitý spinel). Tieto teoretické výpočty boli porovnané s experimentálnymi dátami z literatúry a dátami z experimentálnej časti diplomovej práce s úspešnou zhodou pre kubické systémy (spinel a kubický oxid zirkoničitý). Výsledky experimentov s oxidom hlinitým boli v dobrej zhode s experimentálnymi dátami publikovanými v literatúre, ale boli vyššie ako teoretické hodnoty. Na objasnenie týchto odlišností bolo vytvorených niekoľko hypotéz a tiež boli navrhnuté spôsoby riešenia tejto témy.
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Book chapters on the topic "Post-HIPing"

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Noda, Yoshiro, Toru Shimamori, and Masakazu Watanabe. "Mechanical Properties of Post-Sintered Silicon Nitride Fabricated by Hiping." In Hot Isostatic Pressing— Theory and Applications, 55–60. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2900-8_9.

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Ukyo, Yoshio, Toshio Kandori, and Shigetaka Wada. "Si3N4-SiC composite consolidated by post-HIPing process." In Advanced Materials '93, 581–84. Elsevier, 1994. http://dx.doi.org/10.1016/b978-0-444-81991-8.50143-6.

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Shimada, M., N. Miyagawa, T. Endo, and H. Takizawa. "Post-HIPing of yttria doped tetragonal zirconia/alumina composites." In Hot Isostatic Pressing '93, 391–96. Elsevier, 1994. http://dx.doi.org/10.1016/b978-0-444-89959-0.50046-3.

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Conference papers on the topic "Post-HIPing"

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Ohnsorg, R. W., J. E. Funk, and H. A. Lawler. "Fabrication of ATTAP Ceramic Turbine Components." In ASME 1990 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1990. http://dx.doi.org/10.1115/90-gt-185.

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The development and fabrication of sintered alpha SiC injection molded axial rotors and slip cast vortexes by Carborundum for the Advanced Turbine Technology Applications Project (ATTAP) are discussed. Key injection molding process variables and their levels were identified through modeling and experimental design. Post-HIPing improved the density, strength, and uniformity of injection molded components. The fabrication and strength of slip cast components were enhanced through dispersion and powder beneficiation studies. The component process optimization approaches and current status are presented for each.
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Ohnsorg, R. W., S. K. Lau, M. O. Ten Eyck, and D. A. White. "Injection-Molded and Isopressed α-SiC Components for Stationary Gas Turbine Applications." In ASME 1995 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1995. http://dx.doi.org/10.1115/95-gt-075.

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Sintered α-SiC (HEXOLOY®1 SA) injection-molded buttonhead tensile specimens and isostatically pressed combustor tiles were developed and fabricated by Carborundum for the DOE/Solar Ceramic Stationary Gas Turbine (CSGT) development program. Tooling designs, processing details, material properties, and nondestructive evaluation (NDE) procedures are discussed. Post-sinter hot isostatic pressing (HIPing), which improves density, strength and uniformity, was done on all components. Both injection-molded and isopressed flexure bars produced strengths in excess of 621 MPa (90 ksi), while the fast-fracture tensile strength of injection-molded HEXOLOY® SA SiC was 453 MPa (66 ksi). The injection-molding and isopressing process changes leading to HEXOLOY® SA SiC strength increases are discussed, a recent properties summary on delivered test specimens is given, the buttonhead tensile specimen and combustor tile processing issues are described, and proposed process modifications to enhance fabrication economics are suggested.
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