摘要
本文研究了马氏体组织与贝氏体组织40CrMnSiMoVA(GC-4)超高强度钢的腐蚀疲劳(CF)裂纹扩展特性及机理.结果表明,不同显微组织状态下,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,而且马氏体组织GC-4钢的平台区裂纹扩展速度远大于贝氏体组织.断口分析与理论研究表明。
The property and mechanism of corrosion fatigue (CF) crack propagation ofmartensitic and bainitic 40CrMnSiMoVA (GC-4) ultra-high strength steel was investigated.There is a platform region on CF crack propagation curve of the GC-4 steel with differentmicrostructure in 3.5% NaCl solution, which is similar to its stress corrosion crackingbehaviour. The CF crack propagation rate (in platform region) of martensitic GC-4 steel ismuch higher than that of bainitic one. Through fracture surface examination and theoreticalanalysis, it is revealed that hydrogen embrittlement plays an important role in the CF pro-cess of GC-4 steel.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
1993年第12期B533-B539,共7页
Acta Metallurgica Sinica
基金
国家自然科学基金
关键词
腐蚀疲劳
裂纹扩展
超高强度钢
martensite
bainite
corrosion fatigue
crack propagation rate
hydrogen embrittlement
steel 40CrMnSiMoVA
steel GC-4
