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김근준(K. J. Kim),김준호(J. H. Kim),석치훈(C. H. Seok),박대규(D. K. Park),최국선(G. S. Choi),김문철(M. C. Kim),하태권(T. K. Ha) 한국소성가공학회 2011 한국소성가공학회 학술대회 논문집 Vol.2011 No.10
High temperature deformation behavior of heat-resisting duplex stainless steel for retort used i Pidgeon process for Mg production was investigated in this study. 25Cr-8Ni based duplex stainless steels were cast into rectangular ingots of which the dimension was 350x350x100mm<SUP>3</SUP>. Some amount of Nitrogen and Yttrium was added and phase equilibrium was calculated using the thermodynamic software FactSage® and the database of FSStel. For comparison, 310S steel, widely used heat-resisting austenitic stainless steel, was also casts in this study. On ingotsm dilatometry was carried out in the temperature range from RT to 1200℃ and thermal expansion coefficient were evaluated. Addition of N and Y had no effect on the thermal expansion behavior. High temperature tensile and compression tests were conducted on the ingots at 1230℃, which is operation temperature employed for Mg production by Silicothermic reduction. The steel with N and Y showed much higher strength than 310S in both tensile and compression tests. By thermal exposition at 1230℃ for 64 hrs, hardness of duplex stainless steel containing N and Y was found to increase, while of 310S decreased.