Carbides Formation in MarM247 Directional Solidified during Stress-Rupture Test at High Temperature
Carbides Formation in MarM247 Directional Solidified during Stress-Rupture Test at High Temperature作者机构：Beth Shemesh Engines Ltd. FAA & EASA Beth Shemesh Israel
出 版 物：《Journal of Minerals and Materials Characterization and Engineering》 (矿物质和材料特性和工程（英文）)
年 卷 期：2023年第11卷第5期
页 面：131-142页
学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）]
主 题：MarM247 Carbides Stress-Rupture High-Temperature Crack-Propagation
摘 要：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.
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