航空发动机制件报废锻压模具激光熔覆修复研究

Study on failure forging mould of aeroengine pieces repaired by laser cladding

采用自配的合金粉末,利用激光熔覆技术,对航空发动机制件报废高温锻压模具进行了修复。利用OM、SEM、XRD、显微硬度计对熔覆层的组织结构及硬度进行了研究。结果表明,熔覆层与基材实现了良好的冶金结合,熔覆层基体相为α-Fe,基体相上分布着结晶析出的Fe5C2、Fe2B、FeSi等相,还有一定量的非晶组织。熔覆层最表面硬度较低为670 HV0.2,在熔覆层内部硬度变化不大,平均为730 HV0.2。

The failure aeroengine high-temperature forging mould were repaired by laser cladding with self-made alloying powder. The mierostrueture and hardness were investigated with OM, SEM, XRD and hardmeter. The experimental results indicate that excellent metallurgical bonding is obtained between cladding coating and substrate. The matrix phase in cladding coating is α-Fe, some phases such as Fe5C2, Fe2B and FeSi are distributed on the matrix phase. Otherwise there is an amount of amorphous. The hardness of surface layer is 670 HV0. 2, and the average hardness in coating is 730 HV0. 2.