硅含量对9Cr-1.5W钢在550 ℃下蠕变性能的影响
Effect of Silicon Content on Creep Properties at 550 ℃ of 9Cr-1.5W Steel
何琨 1陈乐 1李刚1
作者信息
- 1. 中国核动力研究设计院,反应堆燃料及材料重点实验室,成都 610213
- 折叠
摘要
在550 ℃下对硅质量分数分别为0.34％,0.60％,0.90％的9Cr-1.5W钢进行拉伸试验以及不同应力下的蠕变试验,研究了硅含量对试验钢高温拉伸性能和蠕变性能的影响.结果表明:随着硅含量的增加,试验钢在550 ℃下的屈服强度和抗拉强度均降低,但断后伸长率增大,应变硬化指数先升后降,含质量分数0.60％硅的试验钢具有最大的应变硬化指数;含质量分数0.60％硅的试验钢在不同应力下均具有较长的蠕变时间,表现出最佳的高温蠕变性能,应力指数最小,最小蠕变速率对外加应力敏感性最低;试验钢的蠕变行为均受位错攀移控制.
Abstract
The tensile test and creep tests under different stresses of 9Cr-1.5W steel with silicon mass fractions of 0.34％,0.60％and 0.90％were carried out at 550 ℃.The effect of silicon content on tensile and creep properties of the test steel at high temperatures was studied.The results show that with the increase of silicon content,the yield strength and tensile strength of the test steel at 550 ℃ decreased,the percentage elongation after fracture increased,and the strain hardening index increased first and then decreased.The test steel with 0.60wt％silicon had the largest strain hardening index.The test steel with 0.60wt％silicon had a long creep time under different stresses,and exhibited the best high temperature creep performance,the lowest stress index,and the lowest minimum creep rate sensitivity to applied stress.The creep behavior of the test steel was controlled by dislocation climbing.
关键词
9Cr-1.5W钢/高温蠕变/硅元素/铁素体相Key words
9Cr-1.5W steel/high temperature creep/silicon element/ferrite phase引用本文复制引用
基金项目
国家自然科学基金核技术创新联合基金资助项目(U1967211)
出版年
2024
NETL
NSTL
万方数据