Effect of volumetric energy density on surface roughness and density of selective laser melted titanium alloy
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摘要: 分别对选区激光熔化的激光功率、扫描间距进行了研究，引入了激光体能量密度，综合分析了工艺参数对钛合金致密度及表面粗糙度的影响。试验结果表明：随着体能量密度的增大，所加工出的金属样的表面粗糙度呈减小趋势。而通过调节激光功率使体能量密度增大的方式更有利于加工出更高致密度的金属零件。Abstract: In this paper, the laser power and scanning distance of selective laser melting were studied respectively, and the influence of process parameter on density and surface roughness of titanium alloy was comprehensively analyzed by introducing volumetric laser energy density. The experimental results show that the surface roughness of machined metal samples decreases with the increase of volumetric energy density via tuning laser power.
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Key words:
- titanium alloy /
- selective laser melting /
- energy density /
- surface roughness /
- density
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图 2 不同激光功率制备的表面形貌
Figure 2. The 3D surface morphologies prepared at different laser powers
图 4 不同扫描间距制备的表面形貌
Figure 4. The 3D surface morphologies prepared at different scanning distance
图 5 体能量密度对表面粗糙的影响
Figure 5. The effect of volumetric energy density on surface roughness
图 6 不同工艺参数制备的样品内部截面示意
(a)～(d)为调节扫描间距调控能量密度的方式；(e)～(h)为调节激光功率调控能量密度的方式
Figure 6. The internal cross section of samples prepared with different process parameters
表 1 工艺参数设计方案
Table 1. Selected technical parameters
编号 激光功率/W 扫描速度/（mm·s−1） 扫描间距/mm 铺粉厚度/mm 体能量密度VED/（J·mm−3） 1 70 900 0.1 0.025 31.1 2 80 900 0.1 0.025 35.6 3 90 900 0.1 0.025 40.0 4 100 900 0.1 0.025 44.4 5 90 900 0.11 0.025 36.4 6 90 900 0.12 0.025 33.3 7 90 900 0.13 0.025 30.8 
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