High-temperature creep properties of fine grained heat-affected zone in P92 weldment

作     者：王学 史专 潘乾刚 吴洪亮 

作者机构：School of Power and MechanicsWuhan University Dongfang Boiler GroupCo.Ltd. School of Materials and MetallurgyWuhan University of Science and Technology Dongfang Boiler Group Co.Ltd. 

出 版 物：《中国有色金属学会会刊：英文版》 (Transactions of Nonferrous Metals Society of China)

年 卷 期：2009年第19卷第S3期

页      面：772-775页

核心收录：

学科分类：08[工学] 0806[工学-冶金工程] 0818[工学-地质资源与地质工程] 0815[工学-水利工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 0813[工学-建筑学] 0703[理学-化学] 0814[工学-土木工程] 080201[工学-机械制造及其自动化] 0702[理学-物理学] 

基　　金：Project (20080430997) supported by the Postdoctoral Science Foundation of China 

主　　题：resistant heat steel welding fine grained heat-affected zone(FGHAZ) creep 

摘      要：The simulated fine grained heat-affected zone (FGHAZ) specimens for P92 welded joints were prepared by heat treatment, then the creep tests were carried out at 650 ℃ under the applied stress of 90-120 MPa to investigate high-temperature creep behavior of FGHAZ. The results show that the creep property of FGHAZ is much inferior to that of the base metal, which exhibits the much higher steady creep rate and shorter time to creep fracture. The power law equation can describe the steady creep rate dependence on applied stress, indicating that the stress exponent n of FGHAZ is distinguished between two regions with n=15.1 at high stresses (more than 100 MPa) and n=8.64 at lower stresses. Based on Monkman-Grant equation, the relationship between the secondary creep rate and time to rupture is obtained to evaluate the creep life of FGHAZ with the applied stress above 100 MPa.