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Fe-20Cr-5Al-xLa 합금 극박판의 고온 산화에 의한 변형 거동
박원욱,오규환,이기선,라형용,김강오 대한금속재료학회(대한금속학회) 1998 대한금속·재료학회지 Vol.36 No.12
Fe-20Cr-5Al(-0.06La) alloy thin strip was spontaneously strained by growth stress which was developed during isothermal high temperature oxidation. The activation energy, Q, for high temperature strain(creep) was determined from the relation between oxidation temperature and stain rate. In La free alloy, the activation energy was calculated to about 332.6 kJ/㏖. The compressive stress of about 651.9 ㎫ and tensile stress of about 10.1 ㎫ was developed in α-alumina oxide film and metal substrate respectively. The high growth stress was relaxed through the not only creep of metal substrate but also local detachment of α-alumina oxide film from the metal substrate. In La added alloy, the activation energy was calculated to about 263.6 kJ/㏖. which was seriously lower than the activation energy for La free alloy. In this case, α-alumina oxide film was not spalled or fractured. The addition of La contributed to not only the decrease of growth stress but also the stress relaxation through creep. It was concluded that easy stress relaxation process was crucial to enhance the adherence between α-alumina film and metal substrate.