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中文摘要：
采用小孔释放法对激光立体成形TC4钛合金沉积态和热处理后的残余应力进行了测试。结果表明，激光立体成形TC4合金的残余应力属于低应力水平，沿激光扫描方向的残余应力σz和垂直于激光扫描方向的残余应力σz具有类似地分布规律。激光扫描起始位置的残余应力值较小，到中间位置达到最大的压应力，而到熔覆结束位置转变为最大的拉应力；靠近基材处熔覆层的残余应力为较大的压应力，随着熔覆高度的增加，到顶部转变为较小的拉应力。相比沉积态试样，去应力退火后σz和σz分别平均降低59．8％和72．3％，固溶时效处理后分别平均降低64．7％和67．8％。热处理后残余应力分布趋于平缓，可有效地消除和调整激光成形过程产生的残余应力。
英文摘要：
The residual stress of Ti-6Al-4V alloys by laser solid forming was measured adopting the standard strain gauge technique involving hole drilling method. Sample treatments were divided into three conditions, that is as deposited, annealing and solution aging treatment. The results indicate that the residual stress exhibits the similar distribution along the laser scanning direction （σy） and normal to the scanning direction （σz）. At the location of laser starting scanning, the stress is lower. The largest stress is the compressive stress at the center position and transformed to the highest tensile stress at the location of ending of laser scanning. It can also be found that the residual stress exhibits bigger compressive stress near the substrate, and with increasing of the cladding layer, it develops to lower tensile stress at the top of sample. After annealing treatment, the stress decreases averagely σy for 59.8% and σz for 72.3%, respectively. After treating by solution aging, the stress decreases averagely σy for 64.7% and σz for 67.8%, respectively. Heat treatment was found to relieve and adjust the residual stresses of laser solid forming Ti-6A1-4V alloy effectively. Key words： laser solid forming; Ti-6A1-4V; heat-treatment; residual stress
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