原位合成M23C6-WC双相碳化物协同增强激光熔覆层摩擦磨损行为的研究

选用W-Fe60-C合金粉末作为原材料，利用激光熔覆技术以最佳工艺参数(激光功率1.5 kW、扫描速度4 mm/s和送粉率10 g/min)在16Mn钢表面制备M23C6-WC (M: Cr, W, Fe)双相碳化物增强铁基熔覆层，并对其微观结构与物相进行表征，以及在商用铁基合金数据库的基础上，使用Thermo-Calc软件进行热力学计算来研究熔覆层的凝固过程. 此外，还对比研究了纯Fe60合金熔覆层、WC增强铁基熔覆层和M23C6-WC双相碳化物增强铁基熔覆层的显微硬度和摩擦磨损行为. 结果显示：M23C6-WC双相碳化物增强铁基熔覆层主要以α-Fe枝晶为基体、W、WC和M23C6复合碳化物为增强相. M23C6碳化物以连续网状结构分布在α-Fe枝晶间，WC颗粒以残留W为形核核心生长成块状分布在熔覆层中. 微观结构结合热力学计算结果表明：激光熔覆过程中M23C6-WC双相碳化物增强铁基熔覆层的凝固过程为液态+W→液态+W+WC→液态+W+WC+γ-(Fe,Ni)枝晶→W+WC+γ-(Fe, Ni)枝晶+M23C6→W+WC+α-Fe枝晶+M23C6. 根据显微硬度和磨损率测试可知：M23C6-WC双相碳化物增强铁基熔覆层的平均显微硬度为835.3 HV0.5，比纯Fe60合金涂层(604.6 HV0.5)和WC增强铁基熔覆层(658.9 HV0.5)分别增加了约230 HV0.5和180 HV0.5. M23C6-WC双相碳化物增强铁基熔覆层的磨损率为3.44×10−6 mm3/(N·m)，比纯Fe60合金熔覆层[8.51×10−5 mm3/(N·m)]和WC增强铁基熔覆层[7.98×10−6 mm3/(N·m)]分别减少了约24.7倍和2.3倍.

Using W-Fe60-C alloy powder as the raw material, the M23C6-WC (M: Cr, W, Fe) dual-phase carbide reinforced iron-based cladding layer was prepared on the surface of 16Mn steel via laser cladding technology with optimal process parameters: laser power of 1.5 kW, scanning speed of 4 mm/s, and powder feeding rate of 10 g/min. Its microstructure and phase composition were characterized, and based on the commercial iron-based alloy database, thermodynamic calculations were performed using Thermo-Calc software to investigate the solidification process of the cladding layer. In addition, a comparative study was conducted on the microhardness and friction-wear behavior of pure Fe60 alloy cladding layer, WC-reinforced iron-based cladding layer, and M23C6-WC dual-phase carbide reinforced iron-based cladding layer. The results show that the M23C6-WC dual-phase carbide reinforced iron-based cladding layer mainly takes α-Fe dendrites as the matrix, with W, WC and M23C6 composite carbides as the reinforcing phases. The M23C6 carbides are distributed in a continuous network structure between the α-Fe dendrites, while the WC particles grow with residual W as the nucleation core and form a bulk distribution in the cladding layer. Combining the microstructure and thermodynamic calculation results, the solidification process of the M23C6-WC dual-phase carbide reinforced iron-based cladding layer during laser cladding is determined as: Liquid + W → Liquid + W + WC → Liquid + W + WC + γ-(Fe,Ni) dendrites → W + WC + γ-(Fe, Ni) dendrites + M23C6 → W + WC + α-Fe dendrites + M23C6. According to the microhardness and wear rate tests, the average microhardness of the M23C6-WC dual-phase carbide reinforced iron-based cladding layer is 835.3 HV0.5, which is approximately 230 HV0.5 and 180 HV0.5 higher than that of the pure Fe60 alloy coating (604.6 HV0.5) and WC-reinforced iron-based cladding layer (658.9 HV0.5), respectively. The wear rate of the M23C6-WC dual-phase carbide reinforced iron-based cladding layer is 3.44×10⁻⁶ mm³/(N·m), which is approximately 24.7 times lower than that of the pure Fe60 alloy cladding layer [8.51×10⁻⁵ mm³/(N·m)] and 2.3 times lower than that of the WC-reinforced iron-based cladding layer [7.98×10⁻⁶ mm³/(N·m)].

搜集汇总

背景与挑战

背景概述

该数据集研究通过激光熔覆技术在16Mn钢表面原位合成M23C6-WC双相碳化物增强铁基熔覆层，并对其微观结构、凝固过程和力学性能进行分析。实验对比了纯Fe60合金、WC增强和双相碳化物增强三种熔覆层，结果显示双相碳化物增强熔覆层具有最高显微硬度（835.3 HV0.5）和最低磨损率（3.44×10−6 mm3/(N·m)），显著提升了材料的耐磨性能。