Nondiffractive beam shaping for enhanced optothermal control in metal additive manufacturing.
Nondiffractive beam shaping for enhanced optothermal control in metal additive manufacturing.
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DOI：
10.1126/sciadv.abg9358
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发表时间：
2021-09-17
期刊：
影响因子：
13.6
通讯作者：
Matthews MJ
中科院分区：
文献类型：
--
作者：
Tumkur TU;Voisin T;Shi R;Depond PJ;Roehling TT;Wu S;Crumb MF;Roehling JD;Guss G;Khairallah SA;Matthews MJ
传播不变贝塞尔光束形式的光束形状工程显着改善了金属增材制造。使用聚焦高斯形光束进行基于粉末床熔融的金属增材制造时，高热梯度和复杂的熔池不稳定性通常会导致孔隙率高、形态质量差和机械性能下降。我们在此展示，与高斯光束相比，贝塞尔光束对不锈钢 (SS 316L) 熔池的时空演化提供了前所未有的控制。值得注意的是，贝塞尔光束的非衍射特性使得 3D 打印期间焦平面定位具有更大的容差。我们还证明，贝塞尔光束显着降低了在广泛的扫描参数空间中形成小孔的可能性。熔池演化和凝固动力学的高速成像揭示了一种独特的机制，其中贝塞尔光束由于热梯度降低而稳定熔池湍流并增加熔池凝固时间。因此，我们在 3D 打印的测试结构中观察到高密度、降低的表面粗糙度和强大的拉伸性能的显着改进。
Beam shape engineering in the form of propagation-invariant Bessel beams significantly improves metal additive manufacturing. High thermal gradients and complex melt pool instabilities involved in powder bed fusion–based metal additive manufacturing using focused Gaussian-shaped beams often lead to high porosity, poor morphological quality, and degraded mechanical performance. We show here that Bessel beams offer unprecedented control over the spatiotemporal evolution of the melt pool in stainless steel (SS 316L) in comparison to Gaussian beams. Notably, the nondiffractive nature of Bessel beams enables greater tolerance for focal plane positioning during 3D printing. We also demonstrate that Bessel beams significantly reduce the propensity for keyhole formation across a broad scan parameter space. High-speed imaging of the melt pool evolution and solidification dynamics reveals a unique mechanism where Bessel beams stabilize the melt pool turbulence and increase the time for melt pool solidification, owing to reduced thermal gradients. Consequently, we observe a distinctively improved combination of high density, reduced surface roughness, and robust tensile properties in 3D-printed test structures.
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影响因子：
3.6
作者：
DURNIN, J;MICELI, JJ;EBERLY, JH
通讯作者：
EBERLY, JH
影响因子：
64.8
作者：
Garcés-Chávez, V;McGloin, D;Dholakia, K
通讯作者：
Dholakia, K
影响因子：
9.4
作者：
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通讯作者：
Moore, A. J.
DOI：
10.1016/j.jmatprotec.2017.08.012
发表时间：
2018-01-01
影响因子：
6.3
作者：
Gunenthiram, V.;Peyre, P.;Fabbro, R.
通讯作者：
Fabbro, R.
影响因子：
9.4
作者：
Khairallah, Saad A.;Anderson, Andrew T.;King, Wayne E.
通讯作者：
King, Wayne E.