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Korean Journal of Metals and Materials > Volume 55(10); 2017 > Article
Korean Journal of Metals and Materials 2017;55(10): 695-702. doi: https://doi.org/10.3365/KJMM.2017.55.10.695
수소 주입 방식에 따른 세 고망간강의 수소 취화 거동 비교
이승용, 황병철
서울과학기술대학교 신소재공학과
Hydrogen Embrittlement of Three High-Manganese Steels Tested by Different Hydrogen Charging Methods
Seung-Yong Lee, Byoungchul Hwang
Department of Materials Science and Engineering, Seoul National University of Science and Technology, Seoul 01811, Republic of Korea
Correspondence  Byoungchul Hwang ,Tel: +82-2-970-6638, Email: bhwang@seoultech.ac.kr
Received: 18 May 2017;  Accepted: 20 June 2017.  Published online: 28 September 2017.
In this study the hydrogen embrittlement characteristics of three high-manganese steels were tested using different hydrogen charging methods, and the results were compared with various Mn-containing steels. The results showed that the hydrogen embrittlement susceptibility of the high-manganese steels increased with increasing inherent strength because deformation mechanisms, such as deformation twinning, ε-martensite transformation, and shear- or micro-band formation, enhanced their sensitivity to hydrogen-induced cracking. The different hydrogen charging methods also affected their ability to achieve the critical hydrogen concentration needed for hydrogen-induced cracking under the stress fields of each microstructure. The relative reduction in ductility for different charging methods usually increased in the order of ex-situ electrochemically-charged, ex-situ high-pressure thermally-charged, and in-situ environment tensile testing, although it was somewhat dependent on the charging, testing and specimen conditions. Based on the results of the three high-manganese steels, it was found that the high-pressure thermally-charged steel specimens had higher relative reductions in ductility because a larger amount of hydrogen was uniformly injected into the steel specimens, which promoted hydrogen-induced cracking under smaller strain than that of the electrochemically-charged steel specimens.
Keywords: high-manganese steel, hydrogen embrittlement, hydrogen charging method, relative ductility reduction
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