Study on the mechanism of influence of different overlap rate on the remelting and recrystallization behavior of the front first cladding layer

文献类型： 外文期刊

第一作者： Sun, Yichang

作者： Sun, Yichang;Li, Chang;Sun, Han;Han, Xing;Wang, Ruijun;Wang, Yiqi

作者机构：

关键词： Laser cladding Fe60; Dendrite remelting; Recrystallization; Phase-field method

期刊名称：APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING （ 影响因子：2.8； 五年影响因子：2.8 ）

ISSN： 0947-8396

年卷期： 2025 年 131 卷 5 期

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收录情况： SCI

摘要： The process of melting and forming needs to be realized through multiple overlap. When the second cladding is overlapped, the heat generated by the laser will affect the first cladding layer, causing it to remelt and recrystallize. In this paper, ASTM 1045 was used as the matrix for laser cladding Fe60, and EDS and dendrite morphology were analyzed. The results show that there is an obvious segregation phenomenon in the cladding layer, and the precipitation is mainly Cr and Ni. The dendrite morphology of the top of the first cladding layer is different at different overlap rates. It is mainly dendritic crystal at 30% overlap rate, equiaxed crystal at 50% overlap rate and cellular crystal at 60% overlap rate. The hardness, strength, toughness and wear resistance of the cladding layer are affected by different dendrite morphologies. The reason for the different morphologies can be revealed by studying the dendrite growth process, thus laying a great foundation for improving the quality of the cladding layer. Since dendrite growth behavior belongs to the mesoscopic scale (100 nm-10 mu m) and exists for a short time, it is difficult to be observed through experiment. Therefore, the phase field model was established to simulate the remelting and recrystallization processes of dendrite structures at the top of the first cladding layer with different overlap rates, and the reason for the difference of dendrite morphologies and segregation of metal elements was revealed in this paper.

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