论文部分内容阅读
在H13压铸模具钢表面进行了激光熔覆Ni-Cr-B-Si耐热疲劳合金的试验研究,利用金相显微镜、扫描电镜、显微维氏硬度计等仪器检测了熔覆层的组织和性能。结果表明,激光熔覆可以得到晶粒超细化、硬度高,与基体结合牢固的表面熔覆层。熔覆层组织为Ni基多元固溶体+碳化物(碳化铬、碳化钨、渗碳体),熔覆层平均硬度约732 HV0.2,平均厚度1.5 mm,与基体相比,其耐热疲劳性能提高112%,可显著提高合金压铸模的使用寿命。
The experimental study of laser cladding Ni-Cr-B-Si heat-resistant fatigue-resisting alloy on the surface of H13 die-casting mold steel was carried out. The microstructure and properties of the cladding layer were examined by metallographic microscope, scanning electron microscope and micro Vickers hardness tester performance. The results show that laser cladding can obtain the surface cladding layer with superfine grains, high hardness and strong bond with the substrate. The microstructure of the cladding layer is Ni-based multiple solid solution + carbide (chromium carbide, tungsten carbide, cementite). The average hardness of the cladding layer is about 732 HV0.2 with an average thickness of 1.5 mm. Compared with the matrix, the thermal fatigue resistance Increased by 112%, can significantly improve the life of the alloy die-casting mold.