摘要
本文研究了热处理对40CrMnSiMoVA(GC-4)超高强度钢应力腐蚀(SCC)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,其应力强度因子门槛值K_(ISCC)没有显著差别,但其应力腐蚀裂纹扩展速度相关较大,随等温温度的升高,应力腐蚀裂纹扩展速度大大降低。这是材料的显微组织性质决定的,与塑性变形能力,屈服强度及氢脆作用有关.
In this paper, the infiuence of heat treatment on stress corrosion cracking (SCC) property of 40CrMnSiMoVA (GC-4) ultra-high strength steel in simulated environment of 3. 5% NaCl solution is investigated. It is shown that heat treatment exerts significant influence on SCC behaviour of GC-4 steel. As the isothermal temperature was changed from 190℃ to 300℃, the SCC crack propagation rate (da/dt)_Ⅱ decreased by one order of magnitude. However, K_(ISCC) almost remained unchanged (14～14. 3MPa m^(1/2)) under three kinds of heat treatments. The influence of heat treatment on SCC behaviour depends on the microscopic structure property of the material.
出处
《西安石油学院学报》
1992年第3期40-44,共5页
Journal of Xi'an Petroleum Institute
关键词
热处理
应力腐蚀
裂纹
扩展
氢脆
heat treatment
stress corrosion cracking
crack propagation rate
hydrogen embrittlement
ultra-high strength steel
