Stress corrosion cracking behavior of PH13-8Mo stainless steel in Cl^- solutions  

作　　者：Qiang Yu Chao-fang Dong Jian-xiong Liang Zhen-bao Liu Kui Xiao Xiao-gang Li 

机构地区：[1]Corrosion and Protection Center, Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China [2]Institute for Special Steel, Central Iron and Steel Research Institute, Beijing 100081, China

出　　处：《Journal of Iron and Steel Research International》2017年第3期282-289,共8页

基　　金：supported by the National Natural Science Foundation of China(No.51171023);the Fundamental Research Funds for the Central Universities(No.FRF-TP-14-011C1);National Basic Research Program of China(973 Program )(No.2014CB643300 );the Beijing Municipal Commission of Education

摘　　要：The stress corrosion cracking（ SCC） behavior of PH13-8Mo precipitation hardening stainless steel（ PHSS） in neutral NaCl solutions was investigated through slow-strain-rate tensile（ SSRT） test at various applied potentials. Fracture morphology,elongation ratio,and percentage reduction of area were measured to evaluate the SCC susceptibility. A critical concentration of 1. 0 mol / L neutral NaCl existed for SCC of PH13-8Mo steel. Significant SCC emerged when the applied potential was more negative than -0. 15 VSCE,and the SCC behavior was controlled by an anodic dissolution（ AD） process.When the applied potential was lower than -0. 55 VSCE,an obvious hydrogen-fracture morphology was observed,which indicated that the SCC behavior was controlled by hydrogen-induced cracking（ HIC）.Between -0. 15 and -0. 35 VSCE,the applied potential exceeded the equilibrium hydrogen evolution potential in neutral NaCl solutions and the crack tips were of electrochemical origin in the anodic region; thus,the SCC process was dominated by the AD mechanism.The stress corrosion cracking（ SCC） behavior of PH13-8Mo precipitation hardening stainless steel（ PHSS） in neutral NaCl solutions was investigated through slow-strain-rate tensile（ SSRT） test at various applied potentials. Fracture morphology,elongation ratio,and percentage reduction of area were measured to evaluate the SCC susceptibility. A critical concentration of 1. 0 mol / L neutral NaCl existed for SCC of PH13-8Mo steel. Significant SCC emerged when the applied potential was more negative than -0. 15 VSCE,and the SCC behavior was controlled by an anodic dissolution（ AD） process.When the applied potential was lower than -0. 55 VSCE,an obvious hydrogen-fracture morphology was observed,which indicated that the SCC behavior was controlled by hydrogen-induced cracking（ HIC）.Between -0. 15 and -0. 35 VSCE,the applied potential exceeded the equilibrium hydrogen evolution potential in neutral NaCl solutions and the crack tips were of electrochemical origin in the anodic region; thus,the SCC process was dominated by the AD mechanism.

关 键 词：Stress corrosion cracking PH13-8Mo precipitation hardening stainless steel Neutral NaCl solution Slow-strain-rate tensile test Applied potential 

分 类 号：TG142.71[一般工业技术—材料科学与工程] TG172.9[金属学及工艺—金属材料]