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为了研究TA15(Ti-6.5Al-1Mo-1V-2Zr)粉末激光成形基板残余应力的影响因素,成形出19个不同工艺参数的试件,采用压痕法分别对其进行残余应力的测量,总结出激光功率、送粉速度、激光扫描速度、成形层数、扫描转角等参数对基板残余应力的影响。研究表明,随着激光功率的增大,基板残余应力数值随之增大,当功率高于1700 W时,基板残余应力开始减小;基板残余应力在送粉速度为0.5~1 g/min和1.5~2 g/min 2个区间内,表现出随着送粉速度的增大残余应力减小的情况,而在1~1.5 g/min区间内表现出相反的情况;基板残余应力随着扫描速度的增大呈现出先增大后减小的趋势;基板残余应力随成形层数的增加而递减;对于不同扫描转角的测试件,扫描转角为60°的情况下,基板残余应力值最小,而30°扫描转角情况下,基板残余应力值最大。
In order to study the influence factors of the residual stress of TA15 (Ti-6.5Al-1Mo-1V-2Zr) powder laser forming substrate, 19 specimens with different technological parameters were formed and their residual stresses were measured by indentation method respectively The effects of laser power, powder feeding speed, laser scanning speed, forming layer number and scan angle on the residual stress of the substrate were investigated. The results show that with the increase of the laser power, the residual stress of the substrate increases. When the power is higher than 1700 W, the residual stress of the substrate begins to decrease. The residual stress of the substrate is between 0.5 ~ 1 g / min and 1.5 ~ 2 g / min 2 intervals, showing the decrease of residual stress with the increase of powder feeding speed, but showed the opposite situation in the range of 1 ~ 1.5 g / min; The increase of velocity shows a trend of first increasing and then decreasing; the residual stress of substrate decreases with the increase of forming layer; for the test pieces with different scanning angles, the residual stress of substrate is the smallest when the scanning angle is 60 ° 30 ° scan angle case, the maximum substrate residual stress value.