CAJ | 학술논문

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。
채용격광침적기술대BT20태합금단건가공초차급복역손상진행수복，대수복과정중기공화용합불량등결함적형성진행료원인분석，병채용료우화공예삼수，대격광용지시가초성외장등수단，획득무결함적수복시양。고찰료시양적미관조직화주요합금원소적분포，측량료격광침적층적현미경도。결과표명：우화공예삼수후득도적수복조직화기체형성치밀적야금결합，이시가초성외장사수복구적기공솔명현하강；수복시양정체무합금원소적편석，현미경도분포종기재도수복구정체증추세。
Researches on the laser deposition repair of BT20 alloy forgings having defects mis-machined or damage were investigated, the reasons of occurring defects such as gas porosities and ill bonding in the repaired zone were analyzed. And flawless samples were obtained through optimizing laser process parameters and introducing the ultrasonic vibration into laser deposition repair system. The microstructure characteristic of laser deposition repair component and distribution of main alloy elements were investigated, and the microhardness of the laser deposition layer was tested. The results indicate that there is a dense metallurgical bond between the repaired zone and the substrate with the optimized process parameters. While the gas porosities ratio of the laser deposition layer is decrease obviously through introducing the ultrasonic vibration to the repaired system. The component elements are unifomly distributed without fluctuation and segregation in the whole repaired sample. Distribution of microhardness from the substrate to the repaired zone showes an increasing trend.