Journal of Power System Engineering (동력기계공학회지)

The Korean Society for Power System Engineering (한국동력기계공학회)
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Effect of Ni and Mn on Strain Induced Martensite Behavior of 22Cr Micro-Duplex Stainless steel

22Cr 마이크로 듀플렉스 스테인리스강의 변형유기마르텐사이트에 미치는 Ni과 Mn의 영향

  • Park, Jun-Young (Department of Materials Sci. & Eng., Pukyong National University) ;
  • Kim, Gi-Yeob (Dept. of Materials Application, Daegu Campus of Korea Polytechnic) ;
  • Ahn, Yong-Sik (Department of Materials Sci. & Eng., Pukyong National University)
  • 박준영 (부경대학교 재료공학과) ;
  • 김기엽 (한국폴리텍대학 대구캠퍼스 신소재응용과) ;
  • 안용식 (부경대학교 재료공학과)
  • Received : 2013.08.01
  • Accepted : 2013.11.12
  • Published : 2013.12.31
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Abstract

The microstructure and deformation behavior in 22Cr-0.2N micro-duplex stainless steels with various Ni and Mn contents were compared using by OM, TEM, and XRD. The 22Cr-0.2N duplex stainless steel plates were fabricated and hot rolled, followed by annealing treatment at the temperature range of $1,000-1,100^{\circ}C$. All the samples showed the common strain hardening behaviour during the tensile test at a room temperature. The steels tested at the temperatures of $-30^{\circ}C$ or $-50^{\circ}C$ showed a distinct inflection point in the stress-strain curves, which should be resulted from the formation of strain-induced martensite(SIM) of austenite phase. This was confirmed by TEM observations. The onset strain of a inflection point in a stress-strain curve should be depended up the value of $M_d30$. With the decrease of the tensile test temperature, the inflection point appeared earlier, and the strength and fracture strain were higher. The tensile behaviour was discussed from the point of austenite stability of the micro-duplex stainless steels with the different Ni and Mn content.

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References

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