열처리공학회지 (Journal of the Korean Society for Heat Treatment)

  • 제26권1호
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  • Pages.14-20
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  • 2013
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  • 1225-1070(pISSN)
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  • 2508-4046(eISSN)
한국열처리공학회 (The Korean Society for Heat Treatment)
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SAF 2205 듀플렉스 스테인레스강의 미세조직 및 기계적 특성에 미치는 냉각속도의 영향

Effect of Cooling Rate on Microstructural and Mechanical Properties of SAF 2205 Duplex Stainless Steel

  • Oh, Y.J. (Dept. of Mat. Sci. & Eng., Changwon National Univ.) ;
  • Yang, W.J. (Korea Institute of Materials Science (KIMS)) ;
  • Lee, J.H. (Korea Institute of Materials Science (KIMS)) ;
  • Kim, D.H. (Korea Institute of Materials Science (KIMS)) ;
  • Yoo, W.D. (Korea Institute of Materials Science (KIMS)) ;
  • Lee, J.H. (Dept. of Mat. Sci. & Eng., Changwon National Univ.)
  • 투고 : 2012.11.09
  • 심사 : 2013.01.07
  • 발행 : 2013.01.30
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초록

Duplex stainless steel, which is a kind of stainless steel with a mixed microstructure of about equal proportions of austenite and ferrite, is generally known as a unique material with excellent corrosion resistance and high strength. However, toughness, strength, and corrosion resistance of the steel could be reduced due to precipitation of topologically closed packed phases such as sigma phase during cooling. In case of large forged products, they have strong possibility that ${\sigma}$-phase precipitates due to difference of cooling rate between surface and inner of the products. Investigation on sigma phase precipitation behavior of duplex stainless steel with change of cooling rate was carried out in this study. Forged SAF 2205 duplex stainless steel was used as specimens to examine the cooling rate effect. Dissolution behavior of sigma phase was also discussed through resolution test of duplex stainless steel containing lots of sigma phase. Experimental results revealed that impact energy was very sensitive to precipitation of small amount sigma phase. However, sigma phase could be removed by short term resolution treatment and impact resistance of the duplex stainless steel was restored.

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참고문헌

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