Effect of the remelting scanning speed on the amorphous forming ability of Ni-based alloy using laser cladding plus a laser remelting process
Effect of the remelting scanning speed on the amorphous forming ability of Ni-based alloy using laser cladding plus a laser remelting process
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激光熔覆+激光重熔工艺重熔扫描速度对镍基合金非晶形成能力的影响
DOI：
10.1016/j.surfcoat.2014.09.067
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发表时间：
2014-11-25
影响因子：
5.4
通讯作者：
Wu, Mingfang
中科院分区：
文献类型：
--
作者：
Li, Ruifeng;Jin, Yajuan;Wu, Mingfang
非晶涂层具有优异的性能，包括高硬度和良好的耐磨性。采用高功率半导体激光熔覆+激光重熔工艺在低碳钢表面制备了（Ni 0. 6 Fe 0. 4）（68）B18 Si 10 Nb 4非晶复合涂层。利用X射线衍射仪（XRD）和扫描电子显微镜（SEM）研究了涂层的微观结构。采用实验和数值模拟相结合的方法，系统研究了重熔扫描速度对镍基合金非晶形成能力的影响。结果表明，扫描速度为4 m/min和5 m/min时，无非晶相形成;扫描速度为6 m/min时，出现非晶相;随着扫描速度的增加，非晶相体积分数增加。当重熔速度为8 m/min时，该分数约为64%。模拟结果表明，重熔扫描速度的增加可能会导致较低的停留时间和较高的冷却速率的熔池。结果表明，在采用激光熔覆+激光重熔工艺时，高的重熔扫描速度是形成非晶相的必要条件。(C)© 2014 Elsevier B. V.保留所有权利。
Amorphous coatings exhibit prominent properties, including high hardness and good wear resistance properties. In this study, Ni-based amorphous composite coatings with a composition of (Ni0.6Fe0.4)(68)B18Si10Nb4 were prepared on a mild steel substrate via high power diode laser cladding plus laser remelting processes. The microstructure of the coating was studied using X-ray diffraction (XRD) and a scanning electron microscope (SEM). The effect of the remelting scanning speed on the amorphous forming ability of the Ni-based alloy was studied systematically by experimental and numerical simulation methods. The results indicated that there was no amorphous phase formed when the scanning speed was 4 m/min and 5 m/min. The amorphous phase was observed when the remelting scanning speed was 6 m/min. The amorphous phase volume fraction increased with an increase in the remelting scanning speed. The fraction was found to be approximately 64% when the remelting speed was 8 m/min. The simulation results indicate that the increase in the remelting scanning speed may lead to lower residence time and higher cooling rate of the melted pool. As a result, high remelting scanning speed can be concluded to be a necessary condition for the formation of the amorphous phase when using the laser cladding plus laser remelting process. (C) 2014 Elsevier B.V. All rights reserved.