Key Laboratory for Advanced Materials of Ministry of Education;
School of Materials Science and Engineering;
Tsinghua University;
Beijing 100084;
China;
Key Laboratory of Pressure Systems and Safety;
Ministryof Education;
School of Mechanical and Power Engineering;
East China University of Science and Technology;
Shanghai 200237;
China;
Medium Mn steels; Hydrogen embrittlement; Core-shell austenite; Chemical heterogeneity; Deformationinduced martensite transformation;