气体催化渗氮对12Cr1MoV钢力学性能的影响

Effect of gas catalytic nitriding on mechanical properties of 12Cr1MoV steel

对12Cr1MoV钢进行了气体催化渗氮表面改性处理,通过光学显微镜、扫描电镜和X射线衍射仪分析了渗氮层组织和物相,利用显微硬度计和摩擦磨损试验机评价了其力学性能。结果表明:采用气体催化渗氮处理后的样件表面形成了13μm厚的ε-Fe_(2-3)N化合物层以及约900μm扩散层;化合物层表面显微压痕无开裂现象,拉伸试验时化合物层无崩落现象,这表明气体催化渗氮改善了化合物层的强韧性;渗氮后12Cr1MoV钢的强度提高,其屈服强度为460 MPa,抗拉强度为550 MPa,伸长率约为10.9%。摩擦磨损试验表明12Cr1MoV催化气体渗氮后具有较好的耐磨性。

The surface modification of 12 Cr1 MoV steel with gas catalytic nitriding was carried out, and microstructure and phase of nitriding layer were analyzed by means of optical microscope, scanning electron microscopy and X-ray diffractomete, the mechanical properties were evaluated by microhardness test and friction and wear test. The results show that the surface of the samples treated by gas catalytic nitriding has a ε-Fe2-3N compound layer of 13 μm thick and a diffusion layer of about 900 μm thick. There is no crack on the surface of the compound layer and no caving phenomenon in the tensile test, which indicates that the gas catalytic nitriding improves the strength and toughness of the compound layer. After gas catalytic nitriding, the strength of the 12 Cr1 MoV steel is increased, and its yield strength is 460 MPa, the tensile strength is 550 MPa, and the elongation is about 10.9%. Friction and wear tests show that the 12 Cr1 MoV steel has good wear resistance after gas catalytic nitriding.