| 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 |
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Received: 18 May 2017; Accepted: 20 June 2017. Published online: 28 September 2017. |
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| ABSTRACT |
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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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