Relationship between microstructure and hydrogen induced cracking behavior in a low alloy pipeline steel
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2017年第12期
论文作者：Jing Li Xiuhua Gao Linxiu Du Zhenguang Liu
文章页码：1504 - 1512
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（H2S）-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.
Jing Li，Xiuhua Gao，Linxiu Du，Zhenguang Liu
State Key Laboratory of Rolling and Automation, Northeastern University
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（H2S）-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.
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