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研究了不同热处理方式下激光沉积修复GH4169合金试样的显微硬度分布变化特点以及拉伸断口形貌特征与变化情况。结果表明:沉积态试样修复区内的硬度平均值为297 HV0.1,热影响区的硬度值为260 HV0.1,均明显低于硬度值为460 HV0.1的基体。热处理后,修复区与热影响区硬度均明显提高,接近于基体硬度。相比于沉积态试样,局部热处理试样平均硬度增加了159 HV0.1,增加53.5%;真空热处理试样平均硬度增加了168 HV0.1,增加56.6%,略高于局部热处理。沉积态与热处理试样拉伸断口均为典型的韧性穿晶断裂,两种热处理方式下拉伸断口的韧窝尺寸变化不大。试验表明局部热处理和真空热处理都可达到提高拉伸性能的目的。
The variation of microhardness distribution of laser repaired GH4169 alloy sample under different heat treatment methods and the morphological characteristics and changes of tensile fracture morphology were studied. The results show that the average hardness of the repaired area is 297 HV0.1 and the hardness of the heat affected zone is 260 HV0.1, which are obviously lower than the hardness of 460 HV0.1. After heat treatment, the hardness of the repaired area and the HAZ were significantly increased, close to the hardness of the substrate. Compared with the as-deposited samples, the average hardness of the local heat-treated samples increased by 159 HV0.1, an increase of 53.5%. The average hardness of the samples treated by vacuum heat treatment increased by 168 HV0.1, an increase of 56.6%, slightly higher than that of the local heat treatment. Tensile fracture of the as-deposited and heat-treated specimens is a typical ductile transgranular fracture, and the dimple size of the tensile fracture under the two heat treatment methods does not change much. Experiments show that the local heat treatment and vacuum heat treatment can achieve the purpose of improving the tensile properties.