발간논문

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Vol.35, No.9, 1146 ~ 1156, 1997
Title
High Temperature Deformation Behavior of High Nitrogen Austenitic Stainless Steels
이태호 , 김성준 T . H . Lee , S . J . Kim
Abstract
Deformation behavior of austenitic super stainless steels(21Ni-22Cr-6Mo-N) was investigated in terms of elevated temperature compression test. Hot rolled plates were machined into cylindrical specimens and the isothermal compression test was carried out in a thermo-mechanical simulator in the temperature range between 900 and 1250℃. The effect of nitrogen contents on deformation resistance was also examined. Dynamic recrystallization occurred at deformation temperatures higher than 1200℃ and dynamic recovery mechanism was dominant at lower temperatures. Recrystallized grain size was decreased with higher strain rate and lower temperature. Higher nitrogen resulted in higher resistance to deformation as well as higher peak stress. Empirical constitutive equations for the deformation were obtained after testing at various strain rates and temperatures. Relations between microstructure and hot deformation behavior were also explained.
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