발간논문

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Vol.29, No.8, 790 ~ 797, 1991
Title
The Effect of Cooling and Strain on Martensitic Transformation in Fe - Ni - Cr - Mn - Si Alloy
박신화Shin Hwa Park, 남원종Won Jong Nam, 윤만순Man Son Yoon, 강신왕Shin Wang Kang, 이도형Do Hyung Lee
Abstract
In Fe-Ni-Cr-Mn-Si shape memory alloy, the effect of cooling methods and strain on the martensitic transformation was investigated. After the solution treatment at 900℃ for 30 minutes, the specimens were air cooled, water cooled and quenched in liquid nitrogen. For air cooled specimens only austenite phase was detected, whereas austenite and ε-martensite phases were detected for specimens water cooled or quenched in liquid nitrogen. The amount of ε-martensite was increased with the cooling rate and strain. But the increasing rate of the amount of ε-martensite was decreased at 5% strain in air cooling and at 3% strain in water cooling, respectively. The occurrence of α`-martensite was found at about 5% strain in air cooled specimens. For water cooled specimens it was found at about 3% strain. These strains almost coinceded with the strains at which the increasing rate of the amount of ε-martensite was changed. The occurrence of α`-martensite in specimens quenched in liquid nitrogen was found less than 0.5% strain.
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