Isothermal Heat Treatment of AISI 430 Ferritic Stainless Steel after High Temperature Gas Nitriding

Park, Sang-Jun; Kim, Jung-Min; Kang, Hee-Jae; Kang, Chang-Yong; Kim, Yung-Hee; Sung, Jang-Hyun

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자료유형: 학술저널

저자정보: 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)

저널정보: 한국열처리공학회 열처리공학회지 열처리공학회지 제25권 제3호

발행연도: 2012.1

수록면: 115 - 120 (6page)

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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.

#AISI430 ferrite stainless steel #HTGN #Isothermal treatment #Nitrogen pearlite

참고문헌 (13)

참고문헌 신청

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공정현 / 2007 / 오스테나이트계 스테인리스강의 고온질화에 따른 조직변화 / 열처리공학회지 20(6):311~317