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stress-rupture measurements of cast magnesium strengthened by in-situ production of ceramic particles

Journal of Magnesium and Alloys 2017年第2期5卷 225-230页

作者： Nagaraj M.Chelliah Sudarshan Lisa Kraemer Harpreet Singh M.K.Surappa Rishi Raj Department of Mechanical Engineering University of Colorado BoulderBoulderCO 80302USA Department of Mechanical Engineering Indian Institute of TechnologyRopar 140001India Erich Schmid Institute of Material Science Austrian Academy of SciencesLeobenA-8700Austria Department of Materials Engineering Indian Institute of ScienceBangalore 560012India

We have introduced a polymer precursor into molten magnesium and then in-situ pyrolyzed to produce castings of metal matrix composites(P-MMCs)containing silicon-carbonitride(SiCNO)ceramic ***-rupture measurements of as-cast P-MMCs was performed at 350 ℃(0.69TM)to 450 ℃(0.78TM)under dead load condition corresponding to tensile stress of 2.5 MPa to 20 *** time-to-fracture data were analyzed using the classical Monkman–Grant *** time-to-fracture is thermally activated and follows a power-law stress exponent exhibiting dislocation *** analysis revealed that while pure magnesium appears to fracture by dislocation slip,the P-MMCs fail from the nucleation and growth of voids at the grain boundaries.

关键词： stress-rupture Polymer derived ceramics Magnesium Dispersion strengthened alloys High temperature Light-weight materials

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Influence of Co, W and Ti on the stress-rupture Lives of a Single Crystal Nickel-base Superalloy

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Journal of Materials Science & Technology 2006年第2期22卷 169-172页

作者： Dayun YANG Tao JIN Nairen ZHAO Zhihui WANG Xiaofeng SUN Hengrong GUAN Zhuangqi HU Department of Superalloy Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

The influence of Co, W and Ti on stress-rupture lives of a Ni-Cr-AI-Mo-Ta-Co-W-Ti single crystal nickel-base superalloy has been investigated using a L9 （34） orthogonal array design （OAD） by statistical analysis. At a selected composition range, Ti content was the most important factor to the effect of the stress-rupture lives and then followed by Co content. W content had the minimum effect on stress-rupture lives. The optimal alloy should contain 10 wt pct Co, 8 wt pct W and zero Ti. The optimized alloy also had good microstructural stability during thermal exposure at 870℃ for 500 h.

关键词： Nickel-base single crystal superalloy Orthogonal array design stress-rupture

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Carbides Formation in MarM247 Directional Solidified during stress-rupture Test at High Temperature

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Journal of Minerals and Materials Characterization and Engineering 2023年第5期11卷 131-142页

作者： Daniel Moreno Itzik Mizrahi Yuri Lipkin Vasiliy Zevin Elinor Itzhak Zion Harush Beth Shemesh Engines Ltd. FAA & EASA Beth Shemesh Israel

In our study, stress-rupture tests were conducted at elevated temperatures to examine the impact of high temperature on MarM247 LC (low carbon). Our main objective was to investigate the alterations in the microstructure, particularly the carbon precipitation, during long-term stress-rupture tests. It was observed that cracks developed near the sample neck, following the path of the carbides and the gamma matrix, rather than occurring in the gamma-gamma prime eutectic. This occurred despite the formation of carbides because of prolonged exposure to high temperature and load, and the crack propagation did not follow that path. Based on these findings, we suggest that a reduction in the carbon content of Mar-M247 LC can enhance the sample's lifespan when subjected to temperatures below 760˚C and a stress of 690 MPa.

关键词： MarM247 Carbides stress-rupture High-Temperature Crack-Propagation

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Influence of boron on mechanical properties of M951 alloy

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中国有色金属学会会刊：英文版 2005年第S3期15卷 86-89页

作者：周鹏杰于金江孙晓峰管恒荣胡壮麒 Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

It is generally agreed that appropriate content of boron is beneficial to mechanical properties of many superalloys. In an effort to improve stress rupture properties of a new superalloy M951, the content of boron is optimized. stress rupture tests were carried out using a FC-20 high temperature creep testing machine. The micro- structure, fracture surface and dislocation structure were investigated by optical microscopy, scanning electron microscopy and transmitting electron microscopy. The results indicate that the addition of boron improves the stress-rupture life at 1100℃ and 40MPa, but does not affect elongation remarkably. The stress-rupture life is the longest when the content of boron is 0.024%. Boron also enhances the tensile ductility and has no obvious effect on the tensile strength.

关键词： boron superalloy M951 alloy stress-rupture life ductility

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Influence of Solution Temperature on Microstructure and Mechanical Properties of Directionally Solidified Superalloy DZ22

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Journal of Materials Science & Technology 1989年第1期5卷 14-18页

作者：陈荣章王罗宝王玉屏 Institute of Aeronautical Materials BeijingPRC.

The microstructure changed markedly with increasing solution temperature, i.e eutectic γ' phases and coarse primary γ' phase are redissolved continuously into matrix, which was finished at 1250-1260℃, and more and finer γ' phases are reprecipitated. The grain boundary morphology changed gradually to 'fine line' form. The dendritic segregation of elements decreased. With raising solution temperature the longitudinal stress-rupture life at high and intermediate temperature were enhanced, but the transversal stress-rupture life at intermediate temperature decreased obviously. The incipient melting temperature of DZ22 alloy was measured to be 1230-1240℃ and may be increased by homogenization at 1150℃. In this paper the principle of determining solution temperature of DS alloys was discussed. It was suggested that the solution temperature of alloy DZ22 selected at 1200-1210℃ is appropri- ate.

关键词： directional solidification stress-rupture microstructure solution temperature

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