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首页> 外文期刊>International Journal of Refractory Metals & Hard Materials >A comparative study of the structure and wear resistance of NiCrBSi/50 wt.% WC composite coatings by laser cladding and laser induction hybrid cladding
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A comparative study of the structure and wear resistance of NiCrBSi/50 wt.% WC composite coatings by laser cladding and laser induction hybrid cladding

机译：激光熔覆和激光感应混合熔覆NiCrBSi / 50 wt。％WC复合涂层的结构和耐磨性的比较研究

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摘要

NiCrBSi/50 wt.%WC composite coatings were produced on carbon steel via laser cladding (LC) and laser induction hybrid cladding (LIHC).The microstructure and phase constituents of the composite coatings before thy sliding wear and the wear behavior were characterized using scanning electron microscopy (SEM) and X-ray diffraction (XRD). Under the same laser processing parameters, the cladding height during LC was much higher than that during LIHC, whereas the dilution, cladding width, heat-affected-zone (HAZ) and efficiency of powder utilization during LC were much smaller than those during LIHC. Additionally, WC particles suffered from more severe heat damage during LIHC compared with those during LC, resulting in the precipitation of herringbone, dendritic and blocky carbides and inhomogeneous distribution of WC particles in the composite coating. However, the increase of the laser scanning speed during LIHC decreased the heat damage of WC particles, improved the homogenous distribution of WC particles and further increased the microhardness of the binder metal, which in turn led to an increase in the wear resistance of the composite coating. (C) 2016 Elsevier Ltd. All rights reserved.
机译：通过激光熔覆（LC）和激光感应混合熔覆（LIHC）在碳钢上制备NiCrBSi / 50 wt。％WC复合涂层，并通过扫描表征了复合涂层在滑动磨损之前的微观结构和相组成以及磨损行为电子显微镜（SEM）和X射线衍射（XRD）。在相同的激光加工参数下，液相色谱过程中的熔覆高度远高于LIHC的熔覆高度，而液相色谱过程中的稀释度，熔覆宽度，热影响区（HAZ）和粉末利用效率却比LIHC的要小得多。此外，与LC相比，WC颗粒在LIHC中遭受更严重的热破坏，导致人字形，树枝状和块状碳化物沉淀，并且WC颗粒在复合涂层中分布不均匀。但是，LIHC期间激光扫描速度的提高降低了WC颗粒的热损伤，改善了WC颗粒的均匀分布，并进一步提高了粘结剂金属的显微硬度，进而导致复合材料的耐磨性提高涂层。 （C）2016 Elsevier Ltd.保留所有权利。

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