발간논문

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Vol.35, No.11, 1492 ~ 1499, 1997
Title
Effects of Ti and B Additions on the Hot Ductility of Type 304 Stainles Steel
이종엽 , 김영환 , 김규영 Jong Yeob Lee , Young Hwan Kim , Kyoo Young Kim
Abstract
The effects of small addition of titanium and boron on the hot ductility of Type 304 stainless steel were investigated. High temperature tensile tests were performed in the temperature range 900-1200℃ with the specimens prepared from either the hot rolled plates or the continuously cast and reheated slabs. The microstructural characteristics of reheated slabs were analyzed, and the recrystallized structure after hot compression test was observed. In order to examine the effect of boron addition on the grain boundary segregation of sulphur, the fracture surface formed at 1000℃ were analyzed by Auger electron microscopy. The addition of a small amount of titanium was found to significantly improve the hot ductility of 304 stainless steel, particularly in the temperature range 1000-1100℃. It was observed that the titanium addition enhanced the dynamic recrystallization during hot deformation and retarded the grain growth during rehearing process due to the distribution of fine titanium-containing inclusion particles. Hot ductility was further improved by addition of both titanium and boron, which could be attributed to decrease in grain boundary segregation of sulphur due to addition of boron.
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