Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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Low Temperature Tensile Properties of High Temperature Gas-nitrided Duplex Stainless Steel

  • On, Han-Yong (Department of Materials science and Engineering, Dong-A University) ;
  • Kong, Jung-Hyun (Center for Advanced Net Shape Manufacturing and Clean Process, Dong-A University) ;
  • Kim, Mi-Jeong (Department of Materials science and Engineering, Dong-A University) ;
  • Park, Sang-Joon (Department of Materials science and Engineering, Dong-A University) ;
  • Kang, Chang-Yong (Division of Materials science and Engineering, Pukyoung National University) ;
  • Sung, Jang-Hyun (Center for Advanced Net Shape Manufacturing and Clean Process, Dong-A University)
  • Received : 2010.07.26
  • Accepted : 2010.09.10
  • Published : 2010.09.30
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Abstract

This investigation was focused on the low temperature tensile properties, phase change, changes in nitrogen content and corrosion resistance in the 22Cr-5Ni-3Mo duplex stainless steel after high temperature gas nitriding and solution annealing (HTGN-SA). From the HTGN-SA treatment, the duplex (ferrite + austenite) phase changed into austenite single phase. The nitrogen content of austenite single-phase steel showed a value of ~0.54%. For the HTGN-SA treated austenitic steel, tensile strength increased with lowering test temperature, on the other hand elongation showed the maximum value of 28.2% at $-100^{\circ}C$. The strain-induced martensitic transformation gave rise to lead the maximum elongation. After HTGN-SA treatment, corrosion resistance of the austenite single-phase steel increased remarkably compared with HTGN- treated steel.

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References

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