By optimising the particle size of cladding alloy powders, in situ micron and submicron (Ti-V)C reinforced Fe-based laser cladding layers were prepared and the dry sliding friction properties were comparatively studied. Results showed that there were same phases of α-Fe, γ, TiC, and TiVC₂ in the two cladding layers. The average grain size of the Fe-based matrix was 3.46 μm and 3.37 μm, the microhardness was 731 HV0.2 and 736 HV0.2, and the area ratio of carbides was 11.14% and 11.02%, respectively. The dry sliding wear resistance of the cladding layer reinforced by 1.95 μm carbides was 2.76 times higher than that of the 0.49 μm carbides. The failure mechanism of the cladding layer with the micron carbides was mainly caused by plastic deformation of the cladding layer matrix, whereas that of the submicron carbides involved both the plastic deformation of the cladding layer matrix and the abrasion that was caused by the peeled carbides.

中文翻译：

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原位微米和亚微米（Ti-V）C增强铁基激光熔覆层干滑动摩擦性能的比较研究

通过优化熔覆合金粉末的粒径，制备了原位微米和亚微米（Ti-V）C增强的铁基激光熔覆层，并对干式滑动摩擦性能进行了比较研究。结果显示存在相同的α-Fe，γ，TiC和TiVC _2相在两个覆层中。Fe基基质的平均晶粒尺寸为3.46μm和3.37μm，显微硬度为731HV0.2和736HV0.2，碳化物的面积比分别为11.14％和11.02％。用1.95μm碳化物增强的覆层的干滑耐磨性是0.49μm碳化物的2.76倍。具有微米级碳化物的覆层的破坏机理主要是由覆层基体的塑性变形引起的，而亚微米级碳化物的破坏机理既涉及覆层基体的塑性变形，也涉及由剥落的碳化物引起的磨损。