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Journal of Iron and Steel Research International

, Volume 26, Issue 9, pp 1011–1021 | Cite as

Hydrogen embrittlement of a microalloyed bainitic forging steel

  • Wei-jun HuiEmail author
  • Zhan-hua Wang
  • Zhi-bao Xu
  • Yong-jian Zhang
  • Xiao-li Zhao
Original Paper
  • 52 Downloads

Abstract

The hydrogen embrittlement (HE) of a novel microalloyed bainitic forging steel with a strength level of 1100 MPa was evaluated using electrochemical charging and slow strain rate tensile test method with notched round bar specimens. The results show that the susceptibility to HE of the as-forged bainitic forging steel is notably higher than that of the quenched and tempered (Q&T) steel at same strength level, which is ascribed primarily to the presence of a relatively high amount of large blocky martensite/austenite (M/A) constituents of the former. It was found that low-temperature tempering treatment at 200 °C could significantly alleviate the susceptibility to HE by a relative decrease of ~ 35% of the as-forged bainitic forging steel at no expense of strength and ductility, though its resistance to HE is still a little lower than that of the Q&T steel. Thus, it is suggested that efforts concerning refining of the large blocky M/A through optimizing chemical composition and processing route could help to further alleviate the susceptibility to HE of the tested bainitic forging steel.

Keywords

Hydrogen embrittlement Bainitic forging steel Microstructure Granular bainite M/A constituent 

Notes

Acknowledgements

This work was financially supported by the National Key Research and Development Program of China (Grant No. 2016YFB0300100).

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Copyright information

© China Iron and Steel Research Institute Group 2019

Authors and Affiliations

  • Wei-jun Hui
    • 1
    Email author
  • Zhan-hua Wang
    • 1
  • Zhi-bao Xu
    • 2
  • Yong-jian Zhang
    • 1
  • Xiao-li Zhao
    • 1
  1. 1.Materials Science and Engineering Research Center, School of Mechanical, Electronic and Control EngineeringBeijing Jiaotong UniversityBeijingChina
  2. 2.Yantai Branch of China North Industries Group Corporation No. 52 Institute Co., Ltd.YantaiChina

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