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采用激光沉积技术对BT20钛合金锻件加工超差及服役损伤进行修复,对修复过程中气孔和熔合不良等缺陷的形成进行了原因分析,并采用了优化工艺参数,对激光熔池施加超声外场等手段,获得无缺陷的修复试样。考察了试样的微观组织和主要合金元素的分布,测量了激光沉积层的显微硬度。结果表明:优化工艺参数后得到的修复组织和基体形成致密的冶金结合,而施加超声外场使修复区的气孔率明显下降;修复试样整体无合金元素的偏析,显微硬度分布从基材到修复区呈递增趋势。
The laser deposition technique was used to repair the over tolerance and service damage of BT20 titanium alloy forgings. The reasons for the formation of defects such as porosity and fusoriness in the repairing process were analyzed. The optimized parameters were used to apply ultrasonic field to the laser puddle Means to obtain a defect-free repair sample. The microstructure of the sample and the distribution of the main alloying elements were investigated, and the microhardness of the laser deposited layer was measured. The results show that the microstructure of the repaired tissue and the matrix obtained by the optimized process parameters form a dense metallurgical bond, while the applied field of ultrasonic field significantly reduces the porosity of the repaired area. The segregation of alloying elements in the repaired sample does not occur. Repair area showed an increasing trend.