激光熔覆Fe/(Ti,W)C复合材料的研究
段明忠，戴宇杰，卿志萍
（武汉工程职业技术学院，湖北 武汉 430080）
摘要：采用CO2激光加工成套设备在45#钢板表面熔覆Fe基涂层和Fe/(Ti,W)C金属陶瓷复合涂层。研究了加入(Ti,W)C对涂层相结构、组织、显微硬度及耐磨性的影响。结果表明，Fe基熔覆层主要组成相为马氏体相，显微组织主要由均匀细小的树枝晶组成；而Fe/(Ti,W)C复合涂层主要由马氏体和(Ti,W)C两种相组成，显微组织主要为花瓣状组织，加入(Ti,W)C颗粒对熔覆层组织有明显影响；熔覆层显微硬度由HV0.2 670提升至HV0.2 900；耐磨性能也有显著提升。
关键词：激光熔覆；Fe基复合涂层；显微组织；显微硬度
中图分类号：TG178 文献标志码：B doi：10.3969/j.issn.1006-0316.2015.08.018
文章编号：1006－0316 (2015) 08－0077－04
Study of Fe/(Ti,W)C composite coatings by laser cladding
DUAN Mingzhong，DAI Yujie，QING Zhiping
( Wuhan Engineering Institute, Wuhan 430080, China )
Abstract：CO2 laser processing system was used to produce Fe-based alloy coating and Fe/(Ti,W)C composite coating on the surface of 45# steel to improve its wear resistance. The phase structure, microstructure, microhardness and wear resistance were studied to investigate the effect of (Ti,W)C on the properties of the coatings. Results showed that the Fe-based coating mainly consisted of martensite phase and the Fe/(Ti,W)C composite coatings consisted of martensite (Ti,W)C. The microstructure of the Fe/(Ti,W)C composite coating mainly consisted of flower-like structure, which was different from the dendrite structure of the Fe-based alloy coatings. Microhardness of the Fe/(Ti,W)C composite coating was about HV0.2 900, which was 34% higher than that of the Fe-based coatings (HV0.2 670). The weight loss of the composite coating was half of that of the Fe-based alloy, showing that the addition of (Ti,W)C to the coating improved wear resistance of the coating significantly.
Key words：laser cladding；Fe-based composite coatings；microstructure；microhardness
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收稿日期：2015－02－03
作者简介：段明忠（1978－），男，湖北武汉人，硕士研究生，讲师，主要研究方向为金属材料和先进加工技术。
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