Laser Beam Shaping in Laser Powder Bed Fusion Additive Manufacturing

激光粉末床熔融（LPBF）是最有前途的工业金属增材制造（AM）技术之一。在这个过程中，通过激光熔化金属粉末薄层（粉末床）的选择性区域来产生物体。由于金属粉末具有固有的低吸收率的激光，有限的激光-材料耦合在实践中观察到的LPBF的生产率和材料的可用性显着借记。该项目将通过在激光束整形的帮助下研究新的能量分布来应对这一挑战。激光束整形的使用可产生特定的辐照分布和相位，通过降低热梯度，从而降低残余热应力或晶粒取向和尺寸，从而提高工艺的生产率以及部件的热历史。

Laser powder-bed fusion (LPBF) is one of the most promising industrial metal Additive Manufacturing (AM) techniques. In this process, the creation of an object occurs by laser melting of selective areas of thin layers of metallic powders (the powder bed). As metallic powders possess intrinsic low absorptivity of the laser light, limited laser-material coupling is observed in practice resulting in significant debits in productivity and materials availability for LPBF. This project will tackle this challenge by investigating new energy distribution with the help of Laser Beam Shaping. The use of a Laser Beam Shaping leads to specific irradiance distribution and phase which could improve the productivity of the process as well as the thermal history of the parts by reducing thermal gradients, thus decreasing the residual thermal stress, or the grain orientation and size.