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

该合作研究项目的目标是研究一种新型的电磁喷丸辅助激光微加工工艺。该项目的研究目标是了解加工过程中激光束辐射和电磁感应产生的压力同时作用下工件的响应，并验证在电磁喷丸辅助激光微加工过程中，施加电磁力可以产生有益的喷丸效果，从而提高工件的机械性能的假设。在连续介质力学和麦克斯韦电磁场理论的基础上，建立了一个物理模型，它可以预测和帮助理解过程的机理。该模型将通过与包括电磁喷丸辅助激光微加工过程的现场观察和被加工工件的表征的实验进行比较来验证。利用光学表面轮廓仪、扫描和透射电子显微镜和X射线衍射仪分别对加工速度、显微组织和残余应力进行表征。还将测试机械加工样品的疲劳性能。如果成功，这项研究将提供对材料在激光辐射和机电作用力下的响应的更好理解。电磁喷丸效应有望提高激光加工零件的力学性能，有可能提高产品质量。这项技术是环保的，因为它不涉及有害化学物质。更好的产品质量和更长的使用寿命减少了重新制造的需要，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.