Effect of cathodic potential on stress corrosion cracking behavior of 21Cr2NiMo steel in simulated seawater

作     者：Menghao Liu Zhiyong Liu Cuiwei Du Xiaoqin Zhan Chunduo Dai Yue Pan Xiaogang Li Menghao Liu;Zhiyong Liu;Cuiwei Du;Xiaoqin Zhan;Chunduo Dai;Yue Pan;Xiaogang Li

作者机构：Corrosion and Protection CenterUniversity of Science and Technology BeijingBeijing 10083China Zhengmao Group Co.Ltd.Zhenjiang 212000China 

出 版 物：《International Journal of Minerals,Metallurgy and Materials》 (矿物冶金与材料学报（英文版）)

年 卷 期：2022年第29卷第2期

页      面：263-270页

核心收录：

学科分类：080503[工学-材料加工工程] 0709[理学-地质学] 0819[工学-矿业工程] 0806[工学-冶金工程] 08[工学] 0708[理学-地球物理学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0802[工学-机械工程] 0702[理学-物理学] 0801[工学-力学（可授工学、理学学位）] 

基　　金：financially supported by the National Science and Technology Major Project China(No.2017-Ⅶ0012-0109) 

主　　题：stress corrosion cracking cathodic potential hydrogen embrittlement seawater high-strength low-alloy steel 

摘      要：This study aims at providing systematically insights to clarify the impact of cathodic polarization on the stress corrosion cracking(SCC)behavior of 21 Cr2 NiMo ***-strain-rate tensile tests demonstrated that 21 Cr2 NiMo steel is highly sensitive to hydrogen embrittlement at strong cathodic *** lowest SCC susceptibility occurred at-775 mV ***,whereas the SCC susceptibility was remarkably higher at potentials below-950 mV *** electron microscopy(SEM)and electron backscattered diffraction(EBSD)revealed that the cathodic potential decline caused a transition from transgranular to intergranular mode in the fracture *** intergranular mode transformed from bainite boundaries separation to prior austenitic grain boundaries separation under stronger cathodic ***,corrosion pits promoted the nucleation of SCC *** conclusion,with the decrease in the applied potential,the SCC mechanism transformed from the combination of hydrogen embrittlement and anodic dissolution to typical hydrogen embrittlement.