Preparation, Microstructure and Properties of Plasma Arc Cladding Layer with WC Reinforced Iron-Based Alloy Powder-Cored Hot Wire
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摘要: 采用电阻热与等离子弧双热源同步加热WC增强铁基合金粉芯丝材的方法制备WC增强铁基合金熔覆层,研究了不同热丝电流(0,40,50,60,70 A)下熔覆层的宏观形貌、显微组织和性能,获得了合适的热丝电流。结果表明:当热丝电流为50 A时,熔覆层的成形质量较好,稀释率最低,为51.77%;随着热丝电流的增大,熔覆层的平均晶粒尺寸先减小后增大,碳化物含量先增多后减少,当热丝电流为50 A时,组织以细小的奥氏体胞状晶为主,晶粒平均尺寸较小,为9.45 μm,并且碳化物含量最多;随着热丝电流的增加,熔覆层的平均硬度先升高后降低,磨损率和摩擦因数均先减小后增大,当热丝电流为50 A时,平均硬度最高,为403.1 HV,摩擦因数和磨损率均最小,分别为0.52和4.53×10-6 mm3·N-1·m-1。Abstract: WC reinforced iron-based alloy cladding layer was prepared by heating WC reinforced iron-based alloy powder-cored wire with resistance heat and plasma arc dual heat source simultaneously. The macromorphology, microstructure and properties of cladding layers under different hot wire currents (0,40,50,60,70 A) were studied, and the appropriate hot wire current was obtained. The results show that when the hot wire current was 50 A, the forming quality of the cladding layers was good with the lowest dilution rate of 51.77%. With increasing hot wire current, the average grain size of the cladding layer first decreased and then increased, and the carbide content first increased and then decreased. When the hot wire current was 50 A, the microstructure mainly consisted of fine cellular austenite, the average grain size was small (9.45 μm), and the carbide content was the highest. With increasing hot wire current, the average hardness of the cladding layer first increased and then decreased, and the wear rate and friction coefficient first decreased and then increased. When the hot wire current was 50 A, the cladding layer had the highest average hardness of 403.1 HV, the smallest friction coefficient of 0.52 and the smallest wear rate of 4.53×10-6 mm3·N-1·m-1.
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