전기화학기법에 의한 슈퍼 오스테나이트 스테인리스강의 열화손상 평가

An Evaluation of Degraded Damage for Superaustenitic Stainless Steel by Electrochemical Polarization Technique

  • 권일현 (전북대학교 기계공학부) ;
  • 이송인 (전북대학교 기계공학부, 자동차신기술연구소) ;
  • 백승세 (전북대학교 대학원 정밀기계공학과) ;
  • 이종기 (호원대학교 기계공학과) ;
  • ;
  • 유효선 (전북대학교 기계공학부, 자동차신기술연구)
  • 발행 : 2001.11.01

초록

This research was undertaken to clarify effects of thermal aging on electrochemical and mechanical properties of superaustenitic stainless steel. The steel was artificially aged at $300{\sim}650^{\circ}C$ for $240{\sim}10,000hrs$. and investigated at $-196{\sim}650^{\circ}C$ using small punch(SP) test. Also, the change in electrochemical properties caused by effects of thermal aging was investigated using electrochemical anodic polarization test in a KOH electrolyte. Carbides and ${\eta}-phase(Fe_2Mo)$ precipitated in the grain bounderies seem to deteriorate the mechanical properties by decreasing cohesive strength in the grain bounderies and promote the current density observed in electrochemical polarization curves. The electrochemical and mechanical properties of superaustenitic stainless steel was drastically decreased in the specimen aged at $650^{\circ}C$.

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