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Carbides Formation in MarM247 Directional Solidified during Stress-Rupture Test at High Temperature
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作者 Daniel Moreno Itzik Mizrahi +3 位作者 Yuri Lipkin Vasiliy Zevin Elinor Itzhak Zion Harush 《Journal of Minerals and Materials Characterization and Engineering》 2023年第5期131-142,共12页
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 microstruct... 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. 展开更多
关键词 MarM247 Carbides STRESS-RUPTURE High-Temperature crack-propagation
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Non-parallel double-crack propagation in rock-like materials under uniaxial compression 被引量:4
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作者 Weidong Pan Xin Wang +2 位作者 Qiming Liu Yongkang Yuan Baodong Zuo 《International Journal of Coal Science & Technology》 EI 2019年第3期372-387,共16页
Coalescence among fractures would have influence on the stability of rock masses. Deep understanding of mechanical behavior of fractured rock masses is an important mean to identify failure mechanism of geological dis... Coalescence among fractures would have influence on the stability of rock masses. Deep understanding of mechanical behavior of fractured rock masses is an important mean to identify failure mechanism of geological disaster. In this study, crack propagation processing was studied through loading pre-fractured specimens of concrete block, termed as rock-like material, in uniaxial compression tests. New non-parallel double-crack geometry was introduced to observe crack coalescence. The flaw combinations are different from the normally used flaw configurations. In addition, ultrasonic detection tests were performed on the test blocks. The stress and strain data of these tests and characteristic parameters of sound wave were recorded. The stress-strain curves of each test block under the uniaxial compression test were drawn, relations among deformation characteristics and crack angle of the crack specimens, and their overall strength were analyzed. It is found that strength of the specimen decreases as crack inclination increases under two crack inclinations. The highest uniaxial compressive strength is found in the specimen with the cracks at the same angle in different directions. Based on description of the crack initiation location, crack surface and the ultimate failure patterns, failure modes of eight subtype for test blocks are divided into three categories. It is expected that the study results could be beneficial for engineering application of jointed rock masses. 展开更多
关键词 Rock-like material Non-parallel DOUBLE cracks crack-propagation path UNIAXIAL compression test
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