加工硬化对304不锈钢应力腐蚀裂纹裂尖力学性能的影响  

Effect of Work Hardening on Mechanical Properties of Stress Corrosion Crack Tip of 304 Stainless Steel

作　　者：张建龙[1,2] 薛河 崔英浩[1] 陈浩[1] ZHANG Jianlong;XUE He;CUI Yinghao;CHEN Hao(College of Mechanical Engineering,Xi’an University of Science and Technology,Xi’an 710054;Xi’an Special Equipment Inspection Institute,Xi’an 710065)

机构地区：[1]西安科技大学机械工程学院,西安710054 [2]西安特种设备检测检验院,西安710065

出　　处：《材料导报》2019年第24期4147-4151,共5页Materials Reports

基　　金：国家自然科学基金(51475362; 11502195)~~

摘　　要：压力管道中应力腐蚀开裂(SCC)是奥氏体不锈钢的主要失效形式之一,同时冷加工变形对材料的力学性能和裂纹的萌生及扩展会产生一定影响。本工作首先利用疲劳拉伸机获取304不锈钢不同冷加工硬化下的材料本构参数,同时利用有限元仿真软件ABAQUS建立了SCC裂纹裂尖宏观分析模型及子模型,研究不同加工硬化下304奥氏体不锈钢材料的SCC裂纹裂尖应力应变、J积分及裂纹扩展速率的影响。结果表明,材料在20%冷加工率变形内,随着材料加工硬化程度的增加,SCC裂纹裂尖Mises应力、J积分逐渐增大,裂纹裂尖应变(PEEQ)减小,一定程度加工硬化会促进和加速304不锈钢发生应力腐蚀开裂。Stress corrosion cracking (SCC) is one of the main failure mode of austenitic steel in pressure piping,and cold working deformation has a certain influence on the material mechanical properties and the crack propagation. Firstly,the constitutive parameters of 304 stainless steel under different cold working hardening conditions were obtained by fatigue stretching machine,and then finite element simulation method was adopted to establish the SCC crack tip analysis model and sub-model in this paper. The SCC crack tip stress strain,J-integration and crack growth rate of 304 austenitic stainless steel were studied under different work hardening. Results show that with the increasing of the material work har-dening degree,the Mises stress and J integral at the SCC tip increase gradually,but the crack tip strain (PEEQ) gradually decreases. To some extent,the work hardening promotes and accelerates the stress corrosion cracking of 304 stainless steel.

关 键 词：加工硬化 应力腐蚀开裂 裂尖 应力应变 

分 类 号：TG174[金属学及工艺—金属表面处理]