马氏体与贝氏体组织GC-4超高强度钢的腐蚀疲劳裂纹扩展

金属学报, 1993, 29(12): 27-33.

马氏体与贝氏体组织GC-4超高强度钢的腐蚀疲劳裂纹扩展

西安石油学院机械系

讲师

西安710061

西北工业大学

基金项目: 国家自然科学基金

关键词：马氏体组织 , bainite , corrosion fatigue , crack propagation rate , hydrogen embrittlement , steel 40CrMnSiMoVA , steel GC-4

CORROSION FATIGUE CRACK PROPAGATION OF MARTENSITIC AND BAINITIC GC-4 ULTRA-HIGH STRENGTH STEEL

LIU Xiaokun , WANG Jianjun , LU Minxu , JIN Shi , FU Xiangjiong Xi'an Petroleum Institute Northwestern Polytechnical University

Keywords： martensite , 贝氏体组织 , 腐蚀疲劳 , 裂纹扩展速度 , 氢脆 , 40CrMnsiMoVA钢 , GC—4钢

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,氢脆在GC-4钢的腐蚀疲劳中起重要作用

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.

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