Nb-Ni-Ti-B强化药芯焊丝堆焊金属组织结构及耐磨性分析

针对Nb-Ni-Ti-B强化药芯焊丝堆焊金属进行研究,采用XRD和SEM分析了样品的相结构和显微结构;研究发现焊丝熔敷金属中的Fe2B能使熔敷金属堆焊层更加稳固,具有良好的抗剥离性能,Fe2B的硬度高、耐磨性好、分布均匀,镶嵌在熔敷金属的基体中有着骨架的作用,使该合金具有了良好的耐磨性;堆焊金属中的TiC为NbC提供了凝结核,形成NbC+TiC复合相,在提高耐磨性的同时有利于促进NbC弥散分布。NbC+TiC复合相弥散分布在熔敷金属中,部分NbC+TiC复合相嵌于Fe2B组织中有利于固化Fe2B组织。通过Nb-Ni-Ti-B强化药芯焊丝堆焊金属与5C-27Cr型高碳高铬合金焊丝熔敷金属磨损试验比较,Nb-Ni-Ti-B强化堆焊金属相对5C-27Cr型高碳高铬合金的耐磨性为2.08。

Analysis of organizational structure and wear resistance of Nb-Ni-Ti-B strengthened flux-cored wire surfacing metal

This paper studies the surfacing metal of Nb-NiTi-B strengthened flux-cored wire,the crystalline structure and morphology were analyzed by XRD and SEM.The results show that Fe2B in the deposited metal can make the deposited metal more stable and has good peeling resistance.Fe2B has high hardness,good wear resistance and uniform distribution.It is embedded in the deposited metal as a skeleton,making the alloy have good wear resistance.TiC in the surfacing metal provides condensation nucleus for NbC to form NbC+TiC eutectic tissue,it is beneficial to promote NbC dispersion distribution while improving wear resistance.The NbC+TiC eutectic structure is dispersed in the surfacing metal,and part of the NbC+TiC eutectic structure embedded in the Fe2B structure is conducive to the fixation of Fe2B structure.By comparing the wear test of NbNi-Ti-B strengthened flux cored wire and 5C-27Cr high carbon and high chromium alloy welding wire,the wear resistance of NbNi-Ti-B strengthened flux cored wire is 2.08 compared with 5C-27Cr high carbon and high chromium alloy welding wire.