Journal of the Korean Institute of Gas (한국가스학회지)

The Korean Institute of GAS (한국가스학회)
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Investigation on Resistance to Hydrogen Embrittlement of High Nitrogen Austenitic Steels for Hydrogen Pipe by the Disc Pressure Test and the Tensile Test on Hydrogen Pre-charged Specimens

디스크 시험 및 수소처리 인장시험에 의한 수소배관용 고질소 스테인리스강의 내수소취성 평가 연구

  • Dong-won, Shin (Safety Research Division, Korea Gas Safety Corporation) ;
  • Min-kyung, Lee (Safety Research Division, Korea Gas Safety Corporation) ;
  • Jeong Hwan, Kim (Safety Research Division, Korea Gas Safety Corporation) ;
  • Ho-seong, Seo (Safety Research Division, Korea Gas Safety Corporation) ;
  • Jae-hun, Lee (Safety Research Division, Korea Gas Safety Corporation)
  • 신동원 (한국가스안전공사 가스안전연구원) ;
  • 이민경 (한국가스안전공사 가스안전연구원) ;
  • 김정환 (한국가스안전공사 가스안전연구원) ;
  • 서호성 (한국가스안전공사 가스안전연구원) ;
  • 이재훈 (한국가스안전공사 가스안전연구원)
  • Received : 2022.11.10
  • Accepted : 2022.12.09
  • Published : 2022.12.31
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Abstract

In this study, characteristics of effect on hydrogen gas was investigated to hydrogen embrittlement by disk and tensile tests. The developed and commercial alloy was fabricated to a plate material made from an alloy ingot. The prepared materials were processed in the form of a disk to measure rupture pressure by hydrogen and helium gas at a rate of 0.1 to 1,000 bar/min. In the hydrogen pre-charged tensile test, a specimen was hydrogenated using an anode charging method, and the yield strength, ultimate tensile strength, elongation, and reduction in area rate were carried by a strain rate test. Also, the microstructure was observed to the fracture surface of the tensile test specimen. As a result, the developed materials satisfied endurable hydrogen embrittlement, and the fractured surface showed a brittleness fracture surface with a depth of several ㎛, but dimple due to ductile fracture could be observed.

본 연구에서는 디스크와 인장시험 등을 통해 수소취성에 대한 재료 특성을 평가하고자 하였다. 이를 위해 니켈 당량이 28.5 이상인 합금 조성과, 이와 유사한 상용 합금 조성 2종에 대해 합금을 제조하였고, 각 합금은 진공유도용해로(Vacuum Induction Melting, VIM)에서 개발 합금(이하 #1)과 상용 배관(이하 각각 #2, #3)을 재용해하여 주조재로 제조하였고, 주조 합금은 단조 및 압연하여 판재로 제조하였다. 디스크형태의 시편은 0.1~1000 bar/min의 속도로 수소와 헬륨으로 가압하여 파열압력을 측정하여 수소에 대한 특성을 평가하였고, 전기화학적 방법으로 수소처리한 인장시편과 비교군에 대해 항복강도, 인장강도, 연신률, 단면적 감소율을 확인하였다. 또한 인장시편은 주사전사현미경을 통해 파단면을 확인하였다. 디스크파열시험과 수소처리 한 시편의 인장시험을 통해, 본 연구를 통해 개발된 강종의 경우 상용 강종과 비교하여 유사한 수소취성 특성을 갖고 있음을 확인하였고, 파단면 또한 미세한 두께의 벽개파괴 특성을 보였지만 기계적 강도에 큰 영향을 미치지 않음에 따라 개발된 고질소 스테인리스강은 내수소취성이 우수한 것으로 평가 할 수 있었다.

Keywords

Acknowledgement

본 연구는 2021년도 산업통상자원부의 재원으로 한국에너지기술평가원(KETEP)의 지원을 받아 수행한 연구과제입니다. (No.20203030040020)

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