论文部分内容阅读
以Ni60+33%Ni/MoS2(质量分数)混合粉末为熔覆材料,在H13钢表面进行了激光熔覆试验,利用光学显微镜(OM)、扫描电子显微镜(SEM)、能谱分析仪(EDS)和X射线衍射仪(XRD)等对激光熔覆层的微观组织进行了分析,测试了激光熔覆层的摩擦磨损性能。结果表明,激光熔覆层的组织是在γ-Ni树枝晶和γ-Ni+MoNi4共晶的基体上分布着Crx Sy颗粒。激光熔覆过程中原位自生的Crx Sy颗粒呈近球状,尺寸在5~20μm之间,尺寸较大的颗粒多分布于熔覆层的上部,尺寸较小的颗粒多分布于熔覆层的中下部。由于Crx Sy的减摩作用,熔覆层的摩擦系数明显低于Ni60熔覆层的摩擦系数,但耐磨性能有所降低。
The laser cladding test was carried out on the surface of H13 steel with Ni60 + 33% Ni / MoS2 (mass fraction) mixed powder as cladding material. The microstructure of the H13 steel was characterized by optical microscope (OM), scanning electron microscope ) And X-ray diffraction (XRD) were used to analyze the microstructure of the laser cladding layer. The tribological properties of the laser cladding layer were tested. The results show that the microstructure of the laser cladding layer is Crx Sy particles distributed on γ-Ni dendrites and γ-Ni + MoNi4 eutectic matrix. The in-situ self-generated Crx Sy particles in the laser cladding process are nearly spherical with the size of 5 ~ 20μm. The larger size particles are distributed in the upper part of the cladding layer. The smaller size particles are distributed in the cladding layer Lower part. Due to the anti-friction effect of Crx Sy, the friction coefficient of the cladding layer is obviously lower than the friction coefficient of the Ni60 cladding layer, but the wear resistance is reduced.