The Effects of Microstructure in Austenitic 316L Stainless Steels on the Strength and Damping Capacity

오스테나이트계 316L 스테인리스강의 강도 및 감쇠능에 미치는 미세조직의 영향

  • SON DONG-WOOK (Division of Materials Science and Engineering, PKNU) ;
  • LEE JONG-MOON (Division of Materials Science and Engineering, PKNU) ;
  • KIM HYO-JONG (Division of Materials Science and Engineering, PKNU) ;
  • NAM KI-WOO (Division of Materials Science and Engineering, PKNU) ;
  • PARK KYU-SEOP (Dept. of Ceramic Science & Engineering, CNU) ;
  • KANG CHANG-YONG (Division of Materials Science and Engineering, PKNU)
  • 손동욱 (부경대학교 신소재공학부) ;
  • 이종문 (부경대학교 신소재공학부) ;
  • 김효종 (부경대학교 신소재공학부) ;
  • 남기우 (부경대학교 신소재공학부) ;
  • 박규섭 (창원대학교 세라믹공학과) ;
  • 강창룡 (부경대학교 신소재공학부)
  • Published : 2006.02.01

Abstract

The effects of microstructure on the damping capacity and tensile properties of 316L stainless steel were investigated. Increasing the degree of cold working, the volume fraction of $\varepsilon-martensite$ decreased after rising to maximum value at specific level of cold working, the volume fraction of d-martensite slowly increased and then dramatically increased from the point of decreasing $\varepsilon-martensite$ volume fraction. Increasing the degree of cold working, the behnvior of damping capacity is similar to that of the $\varepsilon-martensite$. After the damping capacity showing the maximum value at about $20\%$ of cold rolling, damping capacity was decreased with the volume fraction of $\varepsilon-martensite$. Tensile strength was proportional to the volume fraction of d-martensite, and elongation steeply decreased in the range low volume fraction of a'-martensite, then slowly decreased in range the above $10\%$ volume fraction of d-martensite. The damping capacity and elongation is strongly controlled by the volume fraction of $\varepsilon$ martensite with liner relationship. However, the effect of the volume fraction of d-martensite and austenite phase on the damping capacity was not observed. Tensile strength was governed by the volume fraction of d-martensite.

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