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Fe-Ni-Cr-Mn-Si 형상기억합금에 있어서 냉각 및 변형량이 마르텐사이트 변태에 미치는 영향
이도형,박신화,남원종,윤만순,강신왕 대한금속재료학회(대한금속학회) 1991 대한금속·재료학회지 Vol.29 No.8
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.