激光选区熔化Ti-6Al-4V合金工艺参数对致密度及显微硬度的影响
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摘要
采用正交试验研究了激光功率(325W、300W、275 W)、扫描速度(1200 mm/s、1000 mm/s、800 mm/s)、扫描间距(0.14、0.13、0.12 mm)及铺粉层厚(0.04、0.03、0.02 mm)对激光选区熔化成形Ti-6Al-4V钛合金致密度及显微硬度的影响。结果表明:影响致密度的因素主次顺序为激光功率、扫描间距、铺粉层厚、扫描速度;而影响显微维氏硬度的因素主次顺序为铺粉层厚、扫描速度、激光功率、扫描间距。此外,在铺粉层厚为0.03 mm条件下成形的Ti-6Al-4V试块致密度整体较高。考虑工艺参数对Ti-6Al-4V合金致密度及显微维氏硬度的影响,获得最佳工艺参数组合激光功率、扫描速度、扫描间距、铺粉层厚分别为325 W、1000 mm/s、0.12 mm、0.02 mm。
The influences of laser power(325 W, 300 W, 275 W),scanning speed(1200 mm/s,1000 mm/s, 800 mm/s)、scanning gap(0.14 mm,0.13 mm,0.12 mm) and layer thickness(0.04 mm,0.03 mm,0.02 mm) on the compactness and microhardness of selective laser melted Ti-6 Al-4 V alloy were analyzed by orthogonal test.The results show that the factor influencing the compactness in primary and secondary order is laser power, scanning gap, layer thickness and scanning speed,and the factor influencing micro-vickers hardness in primary and secondary order is layer thickness,scanning speed,laser power and scanning gap. Moreover, the compactness of Ti-6Al-4V alloy is higher under the powder layer thickness of 0.03 mm. By considering the influence of process parameters on the compactness and microhardness, the optimal technological parameters can be obtained,which is laser power of 325 W, scanning speed of 1000 mm/s, scanning gap of 0.12 mm and layer thickness of 0.02 mm.
The influences of laser power(325 W, 300 W, 275 W),scanning speed(1200 mm/s,1000 mm/s, 800 mm/s)、scanning gap(0.14 mm,0.13 mm,0.12 mm) and layer thickness(0.04 mm,0.03 mm,0.02 mm) on the compactness and microhardness of selective laser melted Ti-6 Al-4 V alloy were analyzed by orthogonal test.The results show that the factor influencing the compactness in primary and secondary order is laser power, scanning gap, layer thickness and scanning speed,and the factor influencing micro-vickers hardness in primary and secondary order is layer thickness,scanning speed,laser power and scanning gap. Moreover, the compactness of Ti-6Al-4V alloy is higher under the powder layer thickness of 0.03 mm. By considering the influence of process parameters on the compactness and microhardness, the optimal technological parameters can be obtained,which is laser power of 325 W, scanning speed of 1000 mm/s, scanning gap of 0.12 mm and layer thickness of 0.02 mm.
引文
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[4]张升,桂睿智,魏青松,等.选择性激光熔化成形TC4钛合金开裂行为及其机理研究[J].机械工程学报,2013,49(23):21-27.
[5]温如军,谭华,张凤英,等.TC4激光立体成形中基材热影响区组织性能优化研究[J].材料科学与工艺,2011(1):41-46.
[6]Thus L,Verhaeghe F,Craeghs T,et al.A study of the microstructural evolution during selective laser melting of Ti-6Al-4V[J].Acta Materialia,2010,58(9):3303-3312.
[7]葛文君,郭超,林锋.工艺参数对电子束选区激光熔化成形Ti6Al4V合金显微组织的影响[J].稀有金属材料与工程,2015,44(12):3215-3218.