恒位移速率下Fe-15Cr-25Ni合金蠕变裂纹扩展行为  

Creep crack growth behavior of Fe-15Cr-25Ni alloy under displacement control

作　　者：祝苏明[1] 朱世杰[1] 王富岗[1] 

机构地区：[1]大连理工大学材料工程系

出　　处：《大连理工大学学报》1993年第6期655-660,共6页Journal of Dalian University of Technology

摘　　要：在恒位移速率条件下研究了Ｆｅ－１５Ｃｒ－２５Ｎｉ合金的蠕变裂纹扩展行为．蠕变裂纹扩展分为慢速扩展阶段和稳态扩展阶段．稳态裂纹扩展由加载点位移速率控制，不受晶粒尺寸和温度因素的影响．在慢速扩展阶段，小晶粒具有较高的裂纹扩展抗力，计算出的裂纹扩展表观激活能低于蠕变激活能．断口分析表明：随晶粒尺寸的增大、温度的升高、加载点位移速率的降低，材料呈蠕变脆性断裂．The creep crack growth behavior of Fe-15Cr-25Ni alloy has been investigated under displacement control. The creep crack growth consists of slow growth stage and stable growth stage. The stable crack growth rate is controlled by the load line displacement rate and is not influenced by grain size and temperature. In slow crack growth stage, fine grain shows higher crack growth resistance and the apparent activation energy of crack growth is fower than that of creep. Fractography analysis reveals that creep brittle fracture occurs for coarse grain, high temperature and low displacement rate.

关 键 词：蠕变 裂纹扩展 奥氏体合金 位移 

分 类 号：TG115.57[金属学及工艺—物理冶金]