合金元素对激光熔覆M2高速钢涂层组织和性能的研究

发布时间：2019-05-27 10:16

【摘要】：本文探讨了合金元素钒、硼、硅对激光熔覆M2高速钢涂层组织与性能的影响过程,通过对钒、硼、硅激光熔覆M2高速钢涂层组织与性能结果的对比分析,得到合金元素钒、硼、硅在激光熔覆工艺下所起到的影响以及钒、硼、硅系M2激光熔覆高速钢的最佳热处理回火工艺。从而为生产高强度涂层耐磨材料提供理论支持和依据。具体研究内容为使用XRD、OM、SEM等手段对熔覆层的宏观形貌特征、微观组织特征、物相组成等相关作用机理进行表征与分析;通过对涂层硬度、红硬性以及高温磨损性能的分析,对热处理工艺参数进行优化和合金元素的作用机理进行探讨。具体研究结果如下:钒系M2激光熔覆高速钢组织涂层的最佳热处理回火工艺为560℃×1h×1次;M2-3%V和M2-4%V的钒系M2激光熔覆高速钢凝固态组织为马氏体、网状M2C碳化物以及残余奥氏体;M2-3%V和M2-4%V的钒系M2激光熔覆高速钢热处理组织包括回火马氏体和网状M2C碳化物;M2-8%V系M2激光熔覆高速钢组织为铁素体以及碳化物。M2-3%V涂层试样表现出很高的硬度,达到858HV,红硬性数值达到643HV,随着钒含量(3%)的不断增大,激光熔覆高速钢涂层的硬度不断减小,红硬性不断减小,耐磨性逐渐变差;激光熔覆钒系M2高速钢组织熔覆层磨损形式主要有剥层磨损与磨粒磨损,M2-3%V和M2-4%V以剥层磨损为主,M2-8%V以磨粒磨损为主。激光熔覆硼系M2高速钢组织熔覆层的最佳热处理回火工艺为560℃×1h×3次;激光熔覆硼系M2高速钢凝固态组织包含有马氏体、网状M2(C,B)碳化物以及残余奥氏体;热处理回火组织有回火马氏体与网状M2(C,B)碳化物。随着硼含量的不断增大,激光熔覆高速钢涂层的硬度和红硬性略有增大并趋于稳定,磨损性能有所降低;M2-0.5%B的硬度达到889HV,红硬性达到744HV。激光熔覆硼系M2高速钢组织熔覆层其磨损的形式以磨料磨损与剥层磨损为主。M2-0.05%B高速钢以磨料磨损为主,M2-0.3%B兼有磨料与剥层磨损,M2-0.5%B时以剥层磨损形式为主。硅系M2激光熔覆高速钢熔覆层最佳热处理回火工艺为560℃×1h×1次。硅系M2激光熔覆高速钢凝固态组织有马氏体、网状M2C碳化物以及残余奥氏体;热处理回火组织为回火马氏体与网状M2C碳化物。随着硅含量的不断增大,激光熔覆高速钢涂层的硬度和红硬性逐渐增大后减小,磨损性能略微降低。M2-1.0%Si试样的硬度达到882HV,红硬性达到625HV,激光熔覆硅系M2高速钢熔覆层磨损的主要形式为剥层磨损为主。
[Abstract]:In this paper, the effect of alloy elements vanadium, boron and silicon on the microstructure and properties of laser coated M2 high speed steel coating is discussed. The microstructure and properties of M2 high speed steel coating coated by vanadium, boron and silicon are compared and analyzed, and the alloy elements vanadium and boron are obtained. The influence of silicon under laser coating process and the optimum heat treatment and tempering process of vanadium, boron and silicon M2 laser cladding high speed steel. Thus, it provides theoretical support and basis for the production of high strength coating wear-resistant materials. The specific research content is to use XRD,OM,SEM and other means to characterize and analyze the macro-morphology characteristics, microstructure characteristics, phase composition and other related mechanisms of the coating layer. Based on the analysis of hardness, red hardness and high temperature wear properties of the coating, the optimization of heat treatment process parameters and the action mechanism of alloy elements are discussed. The results are as follows: the optimum heat treatment and tempering process of vanadium M2 laser cladding high speed steel microstructure coating is 560 鈩，

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