摘要
采用裂纹扩展微机自动测试系统，研究了热处理对４０ＣｒＭｎＳｉＭｏＶＡ（ＧＧ－４）超高强度钢腐蚀疲劳（ＣＦ）裂纹扩展行为的影响。结果表明，不同热处理时ＧＣ－４钢在３．５％ＮａＣｌ溶液中的ＣＦ裂纹扩展曲线上，都出现了类似于应力腐蚀的平台区，而且随等温温度升高，平台区裂纹扩展速度大大降低，这与材料的显微组织特性有关，研究表明，氢脆在ＧＣ－４钢的腐蚀疲劳中起重要作用。
In this paper,the influence of heat treatment on the corrosion fatigue(CF)crack propagation prop-erties of 40CrMnSiMoVA(GC-4)ultra high qtrerigth steel was investigated using an auto-crack-measure micro-computer system. The results shown that there exists a platform region on the CF crack propagation curves of GC-4steel of all heats in3.5/NaCl solution,which is similar to SCC。The crack propagation rate in platform region decreases remarkably with the rise of ternpering ternperature. The material with different heats has different mi-croscopiC structure,which directly influences its CF behaviour.The crack growth rate of martensitic GC-4 steel isthree times higherthan that of bainite GC-4 steel.It is also shown that hydrogen ernbrittlement plays an importantrole in CF crack propagatlon of GC-4 steel。
出处
《机械强度》
CAS
CSCD
北大核心
1994年第3期74-76,共3页
Journal of Mechanical Strength
基金
国家自然科学基金
关键词
热处理
腐蚀疲劳
裂纹扩展
氢脆
超高强度钢
heat treatment,corrosion fatigue(CF),crack propagation,hydrogen embrittlernent
