Effect of strain rate on the stress corrosion cracking of TP439 stainless steel in water vapor environment at 500℃  

作　　者：Futian Li Guangming Liu Shuaiqi Liu Yanbin Zhu Meng Dong Bangyan Zhang 

机构地区：[1]School of Materials Science and Engineering,Nanchang Hangkong University,Nanchang 330063,China [2]DEC Dongfang Boiler Group Co.Ltd.,Zigong 643001,China

出　　处：《Surface Science and Technology》2024年第1期68-78,共11页表面科学技术(英文)

基　　金：financially supported by National Natural Science Foundation of China under Grant No.51961028.

摘　　要：The effect of water vapor on the stress corrosion cracking(SCC)behavior of TP439 stainless steel at 500℃was investigated using slow strain rate tensile tests at three strain rates of 2×10^(–5)/s,2×10^(–6)/s,and 2×10^(–7)/s.Air was selected as a comparative blank test environment for the water vapor environment.The results showed that the tensile strength of the specimens increased significantly in air when the strain rate was decreased from 2×10^(–5)/s to 2×10^(–7)/s,while it decreased in water vapor.Dynamic strain aging(DSA)and SCC are the main factors contributing to the difference in tensile strength of the specimens in air and water vapor.The SCC of TP439 stainless steel in water vapor at 500℃occurs at a strain rate of 2×10^(–7)/s or even lower.Based on the SCC susceptibility index and SEM observation of specimen fracture,TP439 stainless steel exhibits a slight transgranular SCC in water vapor with low SCC susceptibility.

关 键 词：Stress corrosion cracking Dynamic strain aging Ferritic stainless steel High-temperature water vapor 

分 类 号：TG1[金属学及工艺—金属学]