Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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Isothermal Heat Treatment of AISI 430 Ferritic Stainless Steel after High Temperature Gas Nitriding

  • Park, Sang-Jun (ILJIN GLOBAL, R&D Center, Materials Engineering Dept.) ;
  • Kim, Jung-Min (Department of Materials Science and Engineering, Dong-A University) ;
  • Kang, Hee-Jae (Department of Materials Science and Engineering, Dong-A University) ;
  • Kang, Chang-Yong (Division of Materials Science and Engineering, Pukyong National University) ;
  • Kim, Yung-Hee (Department of Materials Science and Engineering, Dong-A University) ;
  • Sung, Jang-Hyun (Department of Materials Science and Engineering, Dong-A University)
  • Received : 2012.03.27
  • Accepted : 2012.04.20
  • Published : 2012.05.31
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Abstract

It has been known that the ferritic stainless steel can be changed to martensitic stainless steel when nitrogen is added. However the high hardness of martensitic stainless steel prevents the plastic deformation. In this study, instead of martensite, the surface microstructure was changed into nitrogen pearlite to increase the plastic deformation easily by isothermal heat treatment after high temperature gas nitriding (HTGN) the AISI 430 ferritic stainless steel. The isothermal treatment was carried out at $780^{\circ}C$ for 4, 6, and 10 hrs, respectively, after HTGN treatment at $1100^{\circ}C$ for 10 hrs. The surface layer of isothermal-treated steel appeared nitrogen pearlite composed with fine chromium nitride and ferrite. Hence, the interior region that was not affected by nitrogen permeation exhibited ferrite phase. When quenching the isothermal treated steel at 1100oC, martensitic phase formed at the surface layer. The hardness of surface layer of isothermal-treated steel and quenched steel measured the value of 150~240 Hv and 630 Hv, respectively.

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References

  1. D. K. Yoo and J. H. Sung : J. of the Korean Society for Heat Treatment, 19(1) (2006) 3-9.
  2. D. K. Yoo and J. H. Sung : J. of the Korean Society for Heat Treatment, 19(2) (2006) 83-89.
  3. V. G. Garvriljuk, H. Berns : "High Nitrogen steels" Springer, Berlin-New York (1999) pp. 205207
  4. H. J. Lee, J. H. Kong, H. W. Lee, D. K. Yoo, C. Y. Kang, and J. H. Sung : J. of the Korean Society for Heat Treatment, 20(2) (2007) 84-93.
  5. J. H. Kong, D. K. Yoo, J. H. Park, H. W. Lee and J. H. Sung : J. of the Korean Society for Heat Treatment, 20(6) (2007) 311-317.
  6. D. K. Yoo, J. H. Kong, H. J. Lee, J. H. Sung and H. W. Lee : Korean J. of Metals and Materials, 46(11) (2008) 678-682.
  7. H. W. Lee, J. H. Kong, D. J. Lee, H. Y. On and J. H. Sung : Materials Design, 30 (2009) 1691-1696. https://doi.org/10.1016/j.matdes.2008.07.023
  8. D. K Yoo, H. J Lee, C, Y. Kang, K. H. Kim, Y. H. Kim and J. H. Sung : Solid State Phenomena, 118 (2006) 149-154. https://doi.org/10.4028/www.scientific.net/SSP.118.149
  9. J. H. Sung, J. H. Kong, D. K Yoo, H. Y On, D. J. Lee and H. W. Lee : Materials Science and Engineering A, 489 (2008) 38-43. https://doi.org/10.1016/j.msea.2007.11.078
  10. J. H. Kong, D. K. Yoo, H. W. Lee, Y. H. Kim and J. H. Sung : J. of the Korean Society for Heat Treatment, 20(6) (2007) 323-328.
  11. H. Berns, & S. Siebert : ISIJ International, 36 (1996) 927-931. https://doi.org/10.2355/isijinternational.36.927
  12. H. J. Lee, J. H. Kong, D. K Yoo, Y. C. Park and J. H Sung : Advanced Materials Research Vols. 26-28 (2007) 1303-1306. https://doi.org/10.4028/www.scientific.net/AMR.26-28.1303
  13. J. H Sung, J. M. Kim and H. J. Kang : Korea Patent, Application Number 10-2011-0110085.

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