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Vol.38, No.2, 300 ~ 306, 2000
Title
Pesearch Paper / Mechanical Behavior : The Effect of Nitrogen on Hot Ductility of Austenitic Stainless Steels
심상대Sang Dae Shim,김선구Sun Koo Kim,이종석Jong Seog Lee
Abstract
An investigation has been made on the effect of nitrogen content on the hot ductility of austenitic stainless steels containing 18 wt.%Cr-8 wt.%Ni(type 304 steel) and 16.6 wt.%Cr-10.5 wt.%Ni-2 wt.%Mo (type 316 steel) in the temperature range from 900℃ to 1200℃. It was found that increasing nitrogen content in the type 316 steel decreased the hot ductility below the temperature of 1200℃ due to the decrease of stacking fault energy. In the type 304 steel containing δ-ferrite phase, hot ductility was improved with an increase in nitrogen content up to 320 ppm, as a result of decreased amount of δ-ferrite. The addition of nitrogen above 320 ppm, however, reduced the hot ductility due to the decrease in stacking fault energy.
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