Hydrogen Embrittlement of Three High-Manganese Steels Tested by Different Hydrogen Charging Methods

作者：Lee Seung Yong; Hwang Byoungchul^*

来源：Journal of the Korean Institute of Metals and Materials, 2017, 55(10): 695-702.

DOI：10.3365/KJMM.2017.55.10.695

• high-manganese steel
• hydrogen embrittlement
• hydrogen charging method
• relative ductility reduction

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, epsilon-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.

• 出版日期2017-10