Applying holographic laser beams to improve additive manufacturing metallurgy

能量分布对称的传统圆形激光光束被认为是围绕附加制造部件的质量问题的根本因素。使用具有计算机生成的衍射光学元件(DO)的定制重新仿形使得能够修改光束辐照度分布，以产生具有改进的材料特性和物理特性的沉积。这个博士项目将涉及与工业合作伙伴雷尼绍公司的合作和监督，以发展对先进粉末床添加剂制造技术的金属沉积和光学控制的新理解。这项工作将包括研究定制生产的材料中的3D温度分布、流体流动和冷却速度。将研究这种方法对物理和微观结构性能的改善。

Conventional round laser beams of symmetric energy distributions are recognised as a fundamental contributor to the issues surrounding the quality of additively manufactured components. The use of custom re-profiling with computer generated diffractive optical elements (DOEs) enables the modification of beam irradiance profiles with the purpose of creating deposits with improved material properties and physical characteristics. This PhD project will involve collaborative work and supervision with the industrial partners Renishaw plc to develop new understanding of metal depositions and optical control for advanced powder bed additive manufacturing technologies. The work will include studying the 3D temperature distribution, fluid flow and cooling rates in materials produced by custom DOEs. Physical and microstructural property improvements from such an approach will be investigated.