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| Stress corrosion cracking behavior of PH13-8Mo stainless steel in Cl- solutions |
| Qiang Yu1,2,Chao-fang Dong1,*,Jian-xiong Liang2,Zhen-bao Liu2,Kui Xiao1,Xiao-gang Li1 |
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 |
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Abstract 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.
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Received: 12 May 2016
Published: 20 March 2017
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| Fund:the National Natural Science Foundation of China;Fundamental Research Funds for The Central Universities;National Basic Research Program of China 973 Program;the Beijing Municipal Commission of Education |
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Corresponding Authors:
yu qiang
E-mail: 441469060@qq.com
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2017, Vol. 24 
