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为研究Fe-8B-Mo合金的非晶形成能力,采用电火花沉积工艺制备了4种Fe-8B-x Mo(x=13.62,23.62,33.62和43.62,w/%)合金涂层。通过X射线衍射仪(XRD)表征涂层的物相组成,探索获得非晶涂层的可行性,并采用扫描电镜(SEM)、显微硬度测试及摩擦磨损试验进一步研究所得涂层的微观组织与性能。结果表明:4种涂层都由非晶相、马氏体相和Fe2B相组成,其中,13.62%Mo涂层主要含Fe2B相和马氏体相,而23.62%Mo、33.62%Mo和43.62%Mo涂层主要含非晶相,且随着Mo含量的增加,涂层中非晶相含量逐渐减少。4种涂层的组织结构致密,缺陷少,与基体呈良好的冶金结合。23.62%Mo涂层具有最大的峰值显微硬度(1 138.1 HV0.05);同时,该涂层在摩擦磨损的稳定阶段具有最小的平均摩擦因数,且其2 h的磨损质量也最小,表现出更好的摩擦磨损性能。4种涂层的磨损机制均为磨粒磨损和疲劳磨损。
In order to study the amorphous formation ability of Fe-8B-Mo alloy, four Fe-8B-x Mo (x = 13.62,23.62,33.62 and 43.62, w /%) alloy coatings were prepared by EDM. The phase composition of the coating was characterized by X-ray diffraction (XRD) and the feasibility of obtaining the amorphous coating was explored. The microstructure of the obtained coating was further studied by scanning electron microscopy (SEM), microhardness test and tribological test And performance. The results show that all four coatings consist of amorphous phase, martensite phase and Fe2B phase, in which 13.62% Mo coating mainly contains Fe2B phase and martensite phase, while 23.62% Mo, 33.62% Mo and 43.62% The Mo coating mainly contains an amorphous phase, and as the Mo content increases, the amorphous phase content in the coating gradually decreases. The four kinds of coatings have the advantages of compact structure, few defects and good metallurgical bonding with the substrate. 23.62% Mo coating has the highest peak microhardness (1 138.1 HV0.05); at the same time, the coating has the lowest average friction coefficient in the stable stage of friction and wear, and its wear quality is also minimal in 2 h, Better friction and wear properties. The wear mechanisms of the four coatings are abrasive wear and fatigue wear.