Analysis on the Creep Mechanism of 12Cr-Mo-W-0.25V Steel Based on Long-Term Stress Relaxation Test Data

摘要：

　　The current paper investigates on the creep behavior of 12Cr-Mo-W-0.25V heat resistant steel base on the long-term stress relaxation test data.It is shows that the stress relaxation curve can be divided into 2 stages: the high stress stage has higher apparent activation volume of 79~350 b3 and the low stress stage is 35~78 b3.Besides,the Helmholtz free energy at the high stress stage is 827~1034 kJ/mol which is higher than 210~252 kJ/mol of the low stress stage.Taking both apparent activation volume and activation energy into account,it is assumed that the high stress stage is mainly controlled by dislocation slip and the low stress stage is more related to diffusion.

关键词： stress relaxation steady state creep activation volume activation energy

作者: ZHAO Jie CAO Tieshan CHENG Congqian LI Huifang

作者单位: School of Materials Science and Engineering,Dalian University of Technology,China,116085

会议类型: 国际会议

会议名称: 2016 International Symposium on Structural Integrity，ISSI—2016(2016国际结构完整性研讨会)

会议地点: 天津

会议语种:英文

页码: 158-162

在线出版日期: 2016-05-26（万方平台首次上网日期，不代表论文的发表时间）