J. Mater. Sci. Technol. ›› 2017, Vol. 33 ›› Issue (12): 1504-1512.DOI: 10.1016/j.jmst.2017.09.013

Special Issue: 2017腐蚀与防护专辑

• Orginal Article • Previous Articles     Next Articles

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

Li Jing, Gao Xiuhua*(), Du Linxiu, Liu Zhenguang   

  1. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China
  • Received:2017-01-06 Revised:2017-02-14 Accepted:2017-02-15 Online:2017-12-20 Published:2018-01-30
  • Contact: Gao Xiuhua

Abstract:

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 TM 0284. 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.

Key words: Pipeline steel, Microstructure, Hydrogen induced cracking (HIC), Corrosion resistance