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Fe-27%Ni-0.27%C 합금의 마르텐사이크 변태온도와 형태에 관한 연구
손인진,김환철,김학신 ( In Jin Shon,Hwan Cheol Kim,Hak Shin Kim ) 한국열처리공학회 1996 熱處理工學會誌 Vol.9 No.3
This work was carried out in order to investigate the effect of grain size on martensitic transformation temperature and morphology of Fe-27%Ni-0.27%C alloy. The martensitic transformation temperature was raised with increasing the austenitizing temperature within the range from 750℃ to 1200℃, owing to the grain growth, vacancy concentration. It was observed that the larger was the austenite grain, the higher was the martensitic transformation temperature. The influence of the austenite grain size was similar to that of the austenitizing temperature. The morphology of martensite in Fe-27%Ni-0.27%C alloy changed from lath to lenticular with the variation of grain size. From the above results, it was concluded that the martensitic transformation temperature and morphology was mainly dependent upon the austenite grain size.
손인진,김학신 전북대학교 전자산업개발연구소 1990 전자산업연구 Vol.1 No.-
Strengthening of austenite was investigated by shear transformation in Fe-Ni alloy. The yield strength of martensite formed from austenite by shear transformation was 54kg/㎟, which was appreciably hight than that of original austenite, 11kg/㎟. And the yield strength of reversed austenite formed from martensite by shear transformation was 42kg/㎟, which was appreciably higher than original austenite. These increase could be accounted for by grain size refinement, dislocation density increase and formed twin.