J. Mater. Sci. Technol. ›› 2025, Vol. 207: 126-141.DOI: 10.1016/j.jmst.2024.04.022

• Research article • Previous Articles     Next Articles

Effect of Mn alloying on the hydrogen‐assisted cracking behavior in multiphase/duplex stainless steel

Menghao Liua,b,c, Cuiwei Dua,b,c,*, Xiaogang Lia,b,c   

  1. aBeijing Advanced Innovation Center for Materials Genome Engineering, Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China;
    bKey Laboratory for Corrosion and Protection of the Ministry of Education, Institute of Advanced Materials & Technology, University of Science and Technology Beijing, Beijing 100083, China;
    cNational Materials Corrosion and Protection Data Center, University of Science and Technology Beijing, Beijing 100083, China
  • Received:2024-03-04 Revised:2024-04-11 Accepted:2024-04-17 Published:2025-02-01 Online:2024-04-29
  • Contact: *University of Science and Technology Beijing, Beijing 100083, China. E-mail address: dcw@ustb.edu.cn (C. Du)

Abstract: There remains debate on whether Mn is beneficial or detrimental to hydrogen embrittlement in stainless steel. In this work, a series of stainless steels were designed to study the change of hydrogen embrittlement sensitivity, crack propagation, and hydrogen trapping behaviors upon Mn addition. The results suggest that adding 4 wt.% Mn increased hydrogen embrittlement susceptibility, whereas adding 8 wt.% Mn decreased hydrogen embrittlement sensitivity. Forming banded α'-martensite through austenitic grain is the main reason for the increased hydrogen embrittlement sensitivity when adding 4 wt.% Mn, by adsorbing hydrogen, promoting crack initiation, and accelerating crack propagation.

Key words: Hydrogen-assisted cracking, Multiphase stainless steel, Manganese