The hydrogen embrittlement of two austenitic high-manganese steels was investigated using tensile testing under high-pressure gaseous hydrogen. The test results were compared with those of different kinds of austenitic alloys containing Ni, Mn, and N in terms of stress and ductility. It was found that the ultimate tensile stress and ductility were more remarkably decreased under high-pressure gaseous hydrogen than under high-pressure gaseous argon, unlike the yield stress. In the specimens tested under high-pressure gaseous hydrogen, transgranular fractures were usually observed together with intergranular cracking near the fracture surface, whereas in those samples tested under high-pressure gaseous argon, ductile fractures mostly occurred. The austenitic high-manganese steels showed a relatively lower resistance to hydrogen embrittlement than did those with larger amounts of Ni because the formation of deformation twins or microbands in austenitic highmanganese steels probably promoted planar slip, which is associated with localized deformation due to gaseous hydrogen.

1. 서 론
 2. 실험 방법
 3. 실험 결과
 4. 결과 및 고찰
 5. 결 론
 Acknowledgements
 References

• 이승용(서울과학기술대학교 신소재공학과) | Seung-Yong Lee
• 백운봉(한국표준과학연구원 산업측정표준본부) | Un-Bong Baek
• 남승훈(한국표준과학연구원 산업측정표준본부) | Seung Hoon Nam
• 황병철(서울과학기술대학교 신소재공학과) | Byoungchul Hwang Corresponding author