The Effect of Aging Treatment on the Microstructure and Mechanical Properties of Super Duplex Stainless Steel with W

W이 첨가된 슈퍼 2상 스테인리스강의 미세조직과 기계적성질에 미치는 시효처리의 영향

  • 김수천 (부경대학교 신소재공학과부) ;
  • 배동수 (동의대학교 신소재공학과) ;
  • 강창룡 (부경대학교 신소재공학과부)
  • Published : 2009.08.31

Abstract

The effect of aging treatment on the microstructure and mechanical properties of super duplex stainless steel with W was investigated. The phase was precipitated mainly at the early stage of aging and a lower aging temperature under $750^{\circ}C$, but the phase was formed after long-term aging treatment between $600^{\circ}C$ and $900^{\circ}C$. The volume fraction of the phase increased with aging temperature up to $750^{\circ}C$ and then decreased up to $900^{\circ}C$. With an increase in the aging time, the volume fraction phase at the early stage of aging increased slightly, and then increased rapidly beyond a certain time. The rapid increase in the tensile strength and hardness and decrease in the elongation and impact toughness were measured with aging temperatures up to $750^{\circ}C$. On the other hand, the tensile strength and hardness decreased slightly, and the elongation and Charpy impact toughness were unchanged with aging temperatures over $750^{\circ}C$. The tensile strength and hardness increased rapidly at the early stage of aging, and then increased slowly beyond a certain time. The elongation and Charpy impact toughness decreased rapidly at the early stage of aging, and then remained unchanged beyond a certain time. The phase that formed at the early stage of aging and the lower aging temperature had a considerable effect on the elongation and Charpy impact toughness of the super duplex stainless steel with W.

References

  1. 김수천, 강창룡 (2009). "슈퍼2상스테인리스강의 미세조직 및 기계적 성질에 미치는 시효의 영향", 한국해양공학회지, 제23권, 3호, pp 40-45
  2. 강창룡, 김익수 (2001). "슈퍼이상 스테인리스강의 $\sigma$상 석출에 관한 연구", 열처리공학회지, 제14권, 5호, pp 286-291
  3. Charles, J. (1991). "Proc. Conf. on Duplex Stainless Steels", J. Charles and S. Bernhardsson Eds., Les Editions de Physique, Les Ulis, Vol 3, pp 3-48
  4. Charles, J. (1994). "Proc. 4th Int. Conf. on Duplex Stainless Steels", T. G. Gooch Ed., TWI, Cambridge, Vol 1, Paper KI
  5. Cui, J., Kang, C.Y., Miyahara, K. and Park, I.S. (2001). "Degradation of Impact Toughness due to Formation R Phase in High Nitrogen 25 mass%Cr-Ni-Mo Duplex Stainless Steel", ISIJ international, Vol 41, No 2, pp 192-195 https://doi.org/10.2355/isijinternational.41.192
  6. Kondo, K., Ueda, M., Ogawa, K., Okawa H. and Igarashi, M. (1993). "Proc. Inter Conf. On Innovation of Stainless Steels", Florence, Italy, Vol 2, p 191
  7. Nilsson, J.O., Hugtala, T., Johnsson, P., Karlsson, L. and Wilson, A. (1996). "Metall. Mater", Trans. A, Vol 27, p 2196 https://doi.org/10.1007/BF02651874
  8. Okamoto, H., Tsuda, K., Azuma, S., Ueda, M., Ogawa K. and Igarashi, M. (1994). "Proc. 4th Int. Conf. on Duplex Stainless Steels", T. G. Gooch Ed., TWI, Cambridge, Vol 1, p 91
  9. Solomon, H.D. and Devine, T.M. Jr. (1983), "Proc. Conf. on Duplex Stainless Steels", R. A. Lula Ed., Americal Society for Metals, Metals Park, OH, p 693