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손인진,김학신 ( I . J . Shon,H . S . Kim ) 한국열처리공학회 1995 熱處理工學會誌 Vol.8 No.2
The effects of heating rate on the combustion temperature, the ignition temperature, the microstrurcture and the shape memory ability of products formed by combustion were investigated. The ignition temperature decreased with increasing heating rate. Combustion temperature and ΔT(difference temperature between the ignition temperature and the combustion temperature) increased with increasing heating rate. The grain size of the product increased with increasing heating rate. Combustion synthesis did not completely occur below the heating rate of 10℃/min. NiTi intermetallic compound was completely formed at the heating rate of 600℃/min and the product by combustion method had a good shape memory effect.
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.