37CrMoMn钢渗氮处理微观组织与性能研究

Microstructure and Properties of Nitrided Layer Obtained by Gas Nitriding on 37CrMoMn Steel

对37CrMoMn钢钻杆接头进行气体渗氮处理，采用光学显微镜（OM）、X射线衍射仪（XRD）、扫描电子显微镜（SEM）、显微硬度计及磨擦磨损试验研究了渗氮层的显微组织、硬度及耐磨性能。结果表明：渗氮层厚达150μm，氮化形成的ζ-FezN相、ε-F-e3N相和Cr2N相等氮化物增强相，使表面硬度显著增加。渗氮层与基体材料相比摩擦系数显著降低，钻杆接头经过渗氮后，耐磨性提高了8倍。

Gas nitriding treatment are performed on 37CrMoMn steel, and the microstructure, hardness and wear resistance of nitrided layer were investigated by means of optical microscope （OM）, X--ray diffraction（XRD）, scanning electron micro- scope （SEM） ,micro--hardness tester and wear equipment compared with the gas nitride layers. The results show that,the nitrided layer thickness is around 150μm, which consists of ζ-Fe2 N, ε-Fe3 N and Cr2 N, so that the surface hardness increased significantly. The friction coefficient of nitrided layer was significantly lower than the substrate material. The wear resistance of drill pipe joints after nitriding increased by 8 times of the substrate material.