Abstract
Abstract It has been known that the ferritic stainless steel can be changed to martensitic stainless steel whennitrogen is added. However the high hardness of martensitic stainless steel prevents the plastic deformation. Inthis study, instead of martensite, the surface microstructure was changed into nitrogen pearlite to increase theplastic deformation easily by isothermal heat treatment after high temperature gas nitriding (HTGN) the AISI 430ferritic stainless steel. The isothermal treatment was carried out at 780 o C for 4, 6, and 10 hrs, respectively, afterHTGN treatment at 1100 o C for 10 hrs. The surface layer of isothermal-treated steel appeared nitrogen pearlitecomposed with fine chromium nitride and ferrite. Hence, the interior region that was not affected by nitrogen per-meation exhibited ferrite phase. When quenching the isothermal treated steel at 1100 o C, martensitic phaseformed at the surface layer. The hardness of surface layer of isothermal-treated steel and quenched steel mea-sured the value of 150~240 Hv and 630 Hv, respectively.(Received March 27, 2012; Revised April 13, 2012; Accepted April 20, 2012)Key words: AISI430 ferrite stainless steel, HTGN, Isothermal treatment, Nitrogen pearlite
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