基体预热对激光沉积修复GH4169合金性能的影响

Effect of Substrate Preheating on Property of GH4169 Alloys Repaired by Laser Deposition

研究了基体预热对激光沉积修复GH4169合金试样的残余应力、组织和拉伸性能的影响。结果表明,基体预热至300℃的GH4169合金试样,残余应力x向分力σx的平均降幅为59.4 MPa,降低了11.7%。残余应力y向分力σy的平均降幅为189.7 MPa,降低了44.6%。沉积层枝晶间析出Laves相呈现颗粒状的碎化现象。抗拉强度和屈服强度与未预热的修复试样基本一致,断后伸长率为12.3%,提高了近一倍,达到锻件标准。试验表明基体预热可有效提高激光沉积修复GH4169合金的室温拉伸性能。

The effect of substrate preheating process on the residual stress, microstructure, and tensile property of GH4169 alloy samples repaired by laser deposition is studied. The results show that when the substrate is preheated to 300℃, as for the GH4169 alloy sample, the average decrease in amplitude of the residual stress along x direction （σx） is 59.4 MPa, which is reduced by 11.7%. The average decrease in amplitude of σy along y direction is 189.7 MPa, which is reduced by 44.6%. The Laves phase of the interdendritic precipitation in deposition layers presents a granular fragmentation phenomenon. Both the tensile strength and yield strength are basically equivalent to those of repaired samples without preheating, and the elongation rate is 12.3%, which is a onefold increase. These indicate the standard of forging is reached. The experimental results indicate that substrate preheating can effectively improve the tensile property of GH4169 alloys repaired by laser deposition at room temperature.