Microstructure and wear resistance of Fe-based WC coating by multi-track overlapping laser induction hybrid rapid cladding

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• 作者：Shengfeng Zhou^a ; ^{zhousf1228@163.com"" rel=""nofollow} ; Xiaoqin Dai^b ; Haizhong Zheng^a
• 关键词：Laser induction hybrid rapid cladding ; WC ; Wear
• 刊名：Optics and Laser Technology
• 出版年：2012
• 出版时间：February 2012
• 年：2012
• 卷：44
• 期：1
• 页码：190-197
• 全文大小：1675 K

文摘

The carck-free Fe-based +20 wt % WC coating with large area was produced by mutli-track overlapping laser induction hybrid rapid cladding. The results showed that the maximum laser scanning speed and the maximum feeding rate of powder can be increased to 3500 mm/min and 120 g/min, respectively. The cast WC particles were dissolved almost completely and had a worse wettability with Fe-based metal matrix. The precipitated carbides such as M₁₂C and M₂₃C₆ (M=Fe, W, Cr) formed an intergranular network around the primary Fe-based phase enriched with tungsten. The microhardness of coating decreased first, and then increased slightly with an increase in the track. The first track had the highest microhardness (i.e. 870HV_0.2). Moreover, the wear weight of coating approximately had a linear relationship with the sliding distance, and increased with an increase in the sliding speed. The wear rate approximately remained constant with an increase in the sliding distance and was two times lower than that of the hardened steel AISI 1045 with a hardness of 60HRC. The wear mechanism during the dry sliding wear was a combination of oxidation wear and abrasion wear.