Relationship between microstructure and hydrogen induced cracking behavior in a low alloy pipeline steel  

作　　者：Jing Li Xiuhua Gao Linxiu Du Zhenguang Liu 

机构地区：[1]State Key Laboratory of Rolling and Automation,Northeastern University,5henyang 110819,China

出　　处：《Journal of Materials Science & Technology》2017年第12期1504-1512,共9页材料科学技术（英文版）

基　　金：supported by the National High Technology Research and Development Program of China(Grant No.2015AA03A501);the National Natural Science Foundation of China(Grant No.51274063)

摘　　要：Hydrogen induced cracking（HIC） behaviors of a high strength pipeline steel with three different microstructures, granular bainite ＆ lath bainite（GB ＋ LB）, granular bainite ＆ acicular ferrite（GB ＋ AF）, and quasi-polygonal ferrite（QF）, were studied by using corrosion experiment based on standard NACE TM0284. The HIC experiment was conducted in hydrogen sulfide（H_2S）-saturated solution. The experimental results show that the steel with GB ＋ AF and QF microstructure present excellent corrosion resistance to HIC, whereas the phases of bainite lath and martensite/austenite in LB ＋ GB microstructure are responsible for poor corrosion resistance. Compared with ferrite phase, the bainite microstructure exhibits higher strength and crack susceptibility of HIC. The AF ＋ GB microstructure is believed to have the best combination of mechanical properties and resistance to HIC among the designed steels.Hydrogen induced cracking（HIC） behaviors of a high strength pipeline steel with three different microstructures, granular bainite ＆ lath bainite（GB ＋ LB）, granular bainite ＆ acicular ferrite（GB ＋ AF）, and quasi-polygonal ferrite（QF）, were studied by using corrosion experiment based on standard NACE TM0284. The HIC experiment was conducted in hydrogen sulfide（H_2S）-saturated solution. The experimental results show that the steel with GB ＋ AF and QF microstructure present excellent corrosion resistance to HIC, whereas the phases of bainite lath and martensite/austenite in LB ＋ GB microstructure are responsible for poor corrosion resistance. Compared with ferrite phase, the bainite microstructure exhibits higher strength and crack susceptibility of HIC. The AF ＋ GB microstructure is believed to have the best combination of mechanical properties and resistance to HIC among the designed steels.

关 键 词：Pipeline steel Microstructure Hydrogen induced cracking （HIC） Corrosion resistance 

分 类 号：TG142.1[一般工业技术—材料科学与工程]