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首页> 外文期刊>Materials Science and Engineering >A novel crack healing technique in a low carbon steel by cyclic phase transformation heat treatment: The process and mechanism
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A novel crack healing technique in a low carbon steel by cyclic phase transformation heat treatment: The process and mechanism

机译：低碳钢循环相变热处理的新裂纹修复技术：过程与机理

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摘要

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.
机译：裂纹是导致金属材料失效的最重要因素之一，这可能导致巨大的工程损失甚至严重的事故。不仅在经济上，而且在环境保护上，修复金属材料中的裂缝都具有十分重要的意义。然而，当前常见的治愈技术具有各种缺点。因此，我们通过循环相变热处理开发了一种新颖的裂纹修复技术。结果表明，循环相热处理技术可以修复内部裂纹。内部裂纹愈合的过程可分为三个阶段，原子扩散或再结晶是裂纹愈合的机理。在愈合过程的第一阶段，裂纹愈合取决于原子扩散和再结晶。但是，在愈合过程的其他阶段，原子扩散控制着裂纹的愈合。与等温热处理技术相比，该新技术可有效避免基体晶粒粗大化，并通过加速原子扩散提高愈合效率和愈合程度。

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