激光熔覆层与等离子喷焊层凝固组织对比及界面特征

Microstructure of laser cladding layer and plasma transferred arc layer and interface characteristics

通过对气门密封面等离子喷焊基体上进行激光熔覆处理试样的分析,探讨了等离子喷焊层与激光熔覆层的凝固组织特征以及界面区域组织变化。结果表明,在等离子喷焊层基体上生长起来的激光熔覆层的组织更加细小,两层之间呈冶金结合,具有明显的组织遗传性。通过该实验,从微观组织方面证明了对气门密封面进行激光熔覆修复的可行性。

Laser cladding layer was prepared on the substrate of plasma transferred arc layer of a valve. Solidification microstructure and characteristics of interface structure of plasma transferred arc layer and laser cladding layer were investigated. The results show that microstructure of laser cladding layer is more fine than that of plasma transferred arc layer, and metallurgical bonding is obtained and structure heredity is observed between the two layers. The feasibility of laser cladding on repairing of the hermetic surface of valves is proved based on the experiments.