Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Effect of Surface Condition on Tensile Properties of Fe-30Mn-0.2C-(1.5Al) High-Manganese Steels Hydrogen-Charged Under High Temperature and Pressure

고온-고압 수소 주입된 Fe-30Mn-0.2C-(1.5Al) 고망간강의 인장 거동에 미치는 표면 조건의 영향

  • Lee, Seung-Yong (Department of Materials Science and Engineering Seoul National University of Science and Technology) ;
  • Lee, Sang-Hyeok (Department of Materials Science and Engineering Seoul National University of Science and Technology) ;
  • Hwang, Byoungchul (Department of Materials Science and Engineering Seoul National University of Science and Technology)
  • 이승용 (서울과학기술대학교 신소재공학과) ;
  • 이상혁 (서울과학기술대학교 신소재공학과) ;
  • 황병철 (서울과학기술대학교 신소재공학과)
  • Received : 2017.01.17
  • Accepted : 2017.03.28
  • Published : 2017.06.27
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Abstract

In this study, two Fe-30Mn-0.2C-(1.5Al) high-manganese steels with different surface conditions were hydrogen-charged under high temperature and pressure; then, tensile testing was performed at room temperature in air. The yield strength of the 30Mn-0.2C specimen increased with decreasing surface roughness(achieved via polishing), but that of the 30Mn-0.2C-1.5Al specimen was hardly affected by the surface conditions. On the other hand, the tendency of hydrogen embrittlement of the two high-manganese steels was not sensitive to hydrogen charging or surface conditions from the standpoints of elongation and fracture behavior. Based on the EBSD analysis results, the small decrease in elongation of the charged specimens for the Fe-30Mn-0.2C-(1.5Al) high-manganese steels was attributed to the enhanced dislocation pile-up around grain boundaries, caused by hydrogen.

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References

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