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针对焊接快速成形耐磨功能零部件的需求,采用Nb-Ti-V微合金化的方法制备了一种低碳Fe基金属芯焊丝作为焊接成形材料,采用基于熔化极气体保护焊的焊接快速成形技术制备堆焊层试样,对其显微组织和性能进行了研究。显微组织分析表明:堆焊层金属无气孔和裂纹缺陷,主要组织是铁素体和板条马氏体,沿堆积高度方向上,马氏体的板条由粗大变为细小。堆焊层的硬度测试表明:显微硬度平均值为422.7 HV,具有一定的机加工性。干摩擦磨损试验表明:堆焊层的耐磨性是45钢的2.41倍。
In order to meet the demand of the rapid forming and wear-resistant parts of welding, a low-carbon Fe-based metal-core welding wire was prepared by Nb-Ti-V microalloying as a welding forming material and was welded by rapid prototyping Surfacing layer samples were prepared technically, and their microstructure and properties were studied. Microstructure analysis shows that the overlay metal has no pores and crack defects. The main structure is ferrite and lath martensite. The lath of martensite changes from coarse to fine along the height of deposit. The hardness test of the overlay shows that the average microhardness is 422.7 HV and has certain machinability. Dry friction and wear tests show that: the wear resistance of surfacing layer is 2.41 times that of 45 steel.