한국해양공학회:학술대회논문집 (Proceedings of the Korea Committee for Ocean Resources and Engineering Conference)

한국해양공학회 (Korean Society of Ocean Engineers)
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오스테나이트계 25Cr-20Ni 스테인리스강의 고온예변형에 의한 크리프 거동

Creep Behavior of High Temperature Prestrain in Austenitic 25Cr-20Ni Stainless Steels

  • 박인덕 (요코하마국립대학 공학연구원) ;
  • 남기우 (부경대학교 재료공학부) ;
  • 안석환 (부경대학교 기계공학부)
  • Park, In-Duck (Yokohama National University) ;
  • Nam, Ki-Woo (Division of Materials and Science Engineering, Pukyong National University) ;
  • Ahn, Seok-Hwan (School of Mechanical Engineering, Pukyong National University)
  • 발행 : 2002.05.17
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초록

In the present study, we examined the influence of prestrain on creep strength of Class M alloy(STS310S) and Class A(STS310J1TB) alloys containing precipitates. Prestrain was given by prior creep at a higher stress than the following creep stresses. Creep behaviour before and after stress change and creep rate of pre-strianed specimens were compared with that of virgin specimens. Pre-straining produced the strain region where the strain rate was lower than that of a virgin specimen both for STS310J1TB and STS310S steels. The reason for this phenomenon was ascribable to the viscous motion of dislocations, the interaction between dislocations and precipitates in a STS310J1TB steel, and the interaction of dislocations with sub-boundaries in a STS310S steel which has the higher dislocation density and smaller subgrain size resulted from pre-straining at higher stress.

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