凝固过程中的晶粒细化和裂纹

Sindo Kou
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引用次数: 0

摘要

晶粒细化对焊接、铸造和增材制造具有实际意义。尽管进行了大量研究,但仍不太清楚为什么晶粒细化会降低凝固过程中的开裂敏感性,而过度晶粒细化又会增加开裂敏感性。为了帮助理解原因,本研究将树枝间液体和溶质中毒的连续性纳入了考虑范围。本研究还试图估算晶粒细化导致开裂敏感性降低的程度。为此,根据晶粒细化程度修改了裂化敏感性的简单指数。根据焊接和铸造中的裂纹敏感性测试检验了估算的有效性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Grain Refining and Cracking During Solidification

Grain Refining and Cracking During Solidification

Grain refining is of practical interest in welding, casting, and additive manufacturing. Despite extensive studies, it is still not very clear why grain refining can decrease the susceptibility to cracking during solidification and why over grain refining can increase it. To help understand why, the present study included the continuity of the interdendritic liquid and solute poisoning into consideration. The present study also attempted to estimate the decrease in the cracking susceptibility caused by grain refining. To do this, a simple index for the cracking susceptibility was modified by the extent of grain refining. The validity of the estimation was checked against cracking susceptibility tests in welding and casting.

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