Abstract
Crack is one of the most important factors resulting in the failure of metallic material which may lead to huge engineering losses and even severe accidents. Not only in economically, but also in environmental protection, it is highly meaningful to heal cracks in metallic materials. However, the currently common healing techniques are subject to various disadvantage. Therefor we developed a novel crack healing technique by means of cyclic phase transformation heat treatment. The results show that cyclic phase heat treatment technique can heal internal crack. The process of internal crack healing can be divided into three stages, atomic diffusion or recrystallization is the mechanisms of crack healing. In the first stage of the healing process, crack healing depends on atomic diffusion and recrystallization. However, in other stages of the healing process, atomic diffusion controls the crack healing. Compared to isothermal heat treatment technique, this novel technique can avoid coarsening grains of the matrix effectively, and improve the healing efficiency and healing degree by accelerating atomic diffusion.
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