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首页> 外文期刊>Surface & Coatings Technology >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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Effect of the remelting scanning speed on the amorphous forming ability of Ni-based alloy using laser cladding plus a laser remelting process

机译：激光熔覆加激光重熔工艺对重熔扫描速度对镍基合金非晶形成能力的影响

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摘要

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.
机译：非晶涂层具有突出的性能，包括高硬度和良好的耐磨性。在这项研究中，通过高功率二极管激光熔覆和激光重熔工艺，在低碳钢基底上制备了成分为（Ni0.6Fe0.4）（68）B18Si10Nb4的Ni基非晶复合涂层。使用X射线衍射（XRD）和扫描电子显微镜（SEM）研究了涂层的微观结构。通过实验和数值模拟方法，系统地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，当扫描速度为4 m / min和5 m / min时，没有非晶相形成。当重熔扫描速度为6m / min时观察到非晶相。非晶相体积分数随着重熔扫描速度的增加而增加。当重熔速度为8m / min时，发现该分数约为64％。仿真结果表明，重熔扫描速度的提高可能导致熔池的停留时间缩短和冷却速率提高。结果，当使用激光熔覆加激光重熔工艺时，可以认为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。

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