Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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An Nondestructive Evaluation of Degraded Damage for Superaustenitic Stainless Steel

슈퍼 오스테나이트 스테인리스강의 열화손상에 대한 비파괴적 평가

  • 권일현 (전북대학교 기계공학부, 자동차신기술연구소) ;
  • 백승세 (전북대학교 대학원 정밀기계공학과) ;
  • ;
  • 유효선 (전북대학교 기계공학부, 자동차신기술연구소)
  • Published : 2002.07.01
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Abstract

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

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References

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