A study of Ni-based WC composite coatings by laser induction hybrid rapid cladding with elliptical spot
A study of Ni-based WC composite coatings by laser induction hybrid rapid cladding with elliptical spot
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DOI：
10.1016/j.apsusc.2007.10.062
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发表时间：
2008-03
影响因子：
6.7
通讯作者：
Shengfeng Zhou;Yongjun Huang;Xiaoyan Zeng
中科院分区：
文献类型：
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作者：
Shengfeng Zhou;Yongjun Huang;Xiaoyan Zeng
研究了椭圆光斑激光感应复合快速熔覆Ni基WC复合涂层。结果表明，采用6 mm × 4 mm椭圆光斑（长轴为6 mm，短轴为4 mm，长轴与激光扫描方向平行）比采用4 mm × 6 mm椭圆光斑（长轴与激光扫描方向垂直）的效率高。碳化物呈块状和棒状析出，表明在低激光扫描速度下，无论采用哪种椭圆光斑，WC颗粒都受到“解体模式+生长模式”的热损伤。而在高激光扫描速度下，采用6 mm × 4 mm椭圆光斑时，WC颗粒只形成块状碳化物，表现为“碎裂型”热损伤;采用4 mm × 6 mm椭圆光斑时，WC颗粒析出细小碳化物，表现为“辐射型”热损伤。特别是LIHRC的效率比普通激光熔覆提高了4倍以上，并可获得无裂纹的陶瓷-金属涂层。
Ni-based WC composite coatings by laser induction hybrid rapid cladding (LIHRC) with elliptical spot were investigated. Results indicate that the efficiency using the elliptical spot of 6mm×4mm (the major and minor axis of laser beam are 6mm and 4mm, respectively, the major axis is parallel to the direction of laser scanning) is higher than that using the elliptical spot of 4mm×6mm (the major axis is perpendicular to the direction of laser scanning). The precipitated carbides with the blocky and bar-like shape indicate that WC particles suffer from the heat damage of “the disintegration pattern+the growth pattern”, whichever elliptical spot is used at low laser scanning speed. However, at high laser scanning speed, the blocky carbides are only formed if the elliptical spot of 6mm×4mm is adopted, showing that WC particles present the heat damage of “the disintegration pattern”, whereas the fine carbides are precipitated when the elliptical spot of 4mm×6mm is used, showing that WC particles take on the heat damage of “the radiation pattern”. Especially, the efficiency of LIHRC is increased much four times higher than that of the general laser cladding and crack-free ceramic-metal coatings can be obtained.