Acta Metallurgica Sinica (English Letters) ›› 2023, Vol. 36 ›› Issue (7): 1095-1104.DOI: 10.1007/s40195-021-01370-7

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Reveal Hydrogen Behavior at Grain Boundaries in Fe-22Mn-0.6C TWIP Steel via In Situ Micropillar Compression Test

Xu Lu1, Dong Wang1, Di Wan1, Xiaofei Guo2,3, Roy Johnsen1   

  1. 1Department of Mechanical and Industrial Engineering, Norwegian University of Science and Technology, 7491 Trondheim, Norway
    2School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China
    3Steel Institute (IEHK), RWTH Aachen University, 52072 Aachen, Germany
  • Received:2021-09-10 Revised:2021-11-05 Accepted:2021-11-19 Online:2023-07-10 Published:2023-07-04

Abstract:

In this study, the effect of hydrogen on dislocation and twinning behavior along various grain boundaries in a high-manganese twinning-induced plasticity steel was investigated using an in situ micropillar compression test. The compressive stress in both elastic and plastic regimes was increased with the presence of hydrogen. Further investigation by transmission electron backscatter diffraction and scanning transmission electron microscope demonstrated that hydrogen promoted both dislocation multiplication and twin formation, which resulted in higher stress concentration at twin-twin and twin-grain boundary intersections.

Key words: Hydrogen, TWIP steel, Micropillar compression, Grain boundary, t-EBSD