摘要
通过金相、扫描电子显微镜、透射电子显微镜和X射线衍射分析等手段对数控机床主轴用钢渗氮层进行了显微组织、物相组成和耐磨性能测试,并分析了渗氮层摩擦磨损机理。结果表明,渗氮主轴用钢的氮化层深度约为350μm,氮化层最大硬度为900 HV,基体硬度约为326 HV;氮化层表面化合物层的厚度约为6.4μm,与基体之间的界面连接良好,主要由大量的Fe_3N和少量的Fe_4N构成的复相组织;渗氮钢在相同条件下的摩擦系数都要比未渗氮钢更低且更为稳定,表明渗氮层在滑动摩擦磨损过程中可以起到较好的减磨效果;在相同磨损条件下,渗氮主轴用钢的磨损量和失重率较未渗氮主轴用钢小得多,即前者具有更好的抗磨损性能;未渗氮钢的磨损机制主要为氧化磨损、磨粒磨损、粘着磨损和疲劳磨损,而渗氮钢的磨损机制主要为氧化磨损、轻微磨粒磨损和轻微粘着磨损。
Metallographic, scanning electron microscope, transmission electron microscopy and X-ray diffraction analysis were used to study the microstructure, phase composition and wear resistance of nitrided layer on NC machine tool spindle steel, and the friction and wear mechanism of the nitrided layer were analyzed. The results show that the nitriding depth of the steel is about 350 μm, the maximum hardness of nitride layer is 900 HV, the hardness of matrix is about 326 HV. The thickness of the compound layer on the nitride layer is about 6.4 μm, and the interface between the nitride layer and the matrix is well connected, mainly composed of a large number of Fe3N and a small amount of Fe4N formed complex phase.Under the same conditions, friction coefficient of nitrided steel are more stable and lower than non nitrided steel, which shows the nitriding layer can play a better effect of reducing grinding during the process of sliding friction wear. Under the same wear conditions, the nitrided steel has better wear resistance. The wear mechanism of non nitrided steel is mainly oxidation wear, abrasive wear, adhesive wear and fatigue wear, and the wear mechanism of the nitrided steel is mainly oxidation wear, slight abrasive wear and slight adhesive wear.
出处
《铸造技术》
CAS
北大核心
2017年第1期92-95,102,共5页
Foundry Technology
关键词
表面离子渗氮
渗层
组织
耐磨性能
surface ion nitriding
infiltration layer
microstructure
wear resistance
