Collaborative Research: Electromagnetic Peening Assisted Laser Micromachining (EPALM) - A Hybrid Micromachining Process with Enhanced Mechanical Properties

本合作研究项目的目标是研究一种新的电磁强化辅助激光微加工工艺。本项目的研究目的是了解工件在加工过程中激光束辐射和电磁感应产生的压缩力同时作用下的响应，并验证在电磁强化激光微加工过程中，施加电磁力可以产生有益的强化效果，提高工件的力学性能的假设。将基于连续介质力学和麦克斯韦电磁场理论建立一个基于物理的模型，该模型可以预测和帮助理解过程机制。该模型将通过与电磁强化辅助激光微加工过程的现场观察和加工工件特性的实验比较来进行测试。利用光学表面轮廓仪、扫描电镜和透射电镜以及x射线衍射分别对加工速度、显微组织和残余应力进行表征。加工样品的疲劳性能也将进行测试。如果成功，这项研究将提供对激光辐射和机电力下材料响应的更好理解。电磁喷丸效应有望提高激光加工工件的力学性能，具有提高产品质量的潜力。这项技术是环保的，因为它不涉及有害的化学物质。更好的产品质量和更长的使用寿命减少了对再制造的需求，因此意味着更少的能源和材料消耗以及更少的废物产生。

The goal of this collaborative research project is to investigate a novel electromagnetic peening-assisted laser micromachining process. The research objectives of the project are to understand responses of a workpiece under the simultaneous action of laser beam radiation and compressive forces generated by electromagnetic induction during machining, and to test the hypothesis that, during the electromagnetic peening-assisted laser micromachining process, the application of electromagnetic forces can generate a beneficial peening effect, enhancing the mechanical properties of the workpiece. A physics-based model will be developed based on continuum mechanics and Maxwell's electromagnetic field theory, which can predict and help understand the process mechanism. The model will be tested by comparing with experiments that include both in-situ observations of the electromagnetic peening-assisted laser micromachining process and the characterization of the processed workpieces. The machining rate, microstructures and residual stresses will be characterized using an optical surface profilometer, scanning and transmission electron microscopes and X-ray diffraction respectively. The fatigue properties of machined samples will also be tested. If successful, this research will provide an improved understanding of material response under laser radiation and electromechanical forces. The electromagnetic peening effect is expected to enhance the mechanical properties of laser-machined workpieces, with a potential to improve product quality. This technology is environmentally friendly as it does not involve harmful chemicals. Better product quality and longer lifetime decrease the need for re-manufacturing and hence imply less energy and material consumption and less waste generation.