Optimisation du durcissement au laser appliqué à des composants de transmission en aciers faiblement alliés

Pierre-Paul Beaulieu设备公司是一家位于比克（魁北克）的公司，专门制造机动设备，如吹雪机和泥炭收获设备。在该公司近年来注意到的问题中，低合金钢的衬套和槽的过早磨损。实际上，磨损是一系列复杂的现象，导致碎片排放，质量、肋状物、形状丧失，并伴随着表面的物理和化学变化。此外，它通常不会根据诸如速度、温度或时间的参数以渐进的方式变化。为了解决磨损问题，有必要重新考虑材料的选择，审查机械部件的设计或采用热处理工艺来硬化零件。由于无法在零件满足特定功能的情况下达到设计标准，因此有必要通过选择使用激光工艺进行表面处理来探索材料及其热处理。这将是相关的测试几种材料，并保留那些提供技术和经济效益。该项目的主要目标是进行实验研究，以优化重型工业机械用低合金钢衬套和槽的硬化。第一个目标是进行全面的研究，以确定所涉及的现象以及在操作过程中产生的应力和变形水平。第二个目标是提出一个系统的研究，以检测激光工艺参数对性能的影响，并通过制定适当的策略来收敛到最佳的硬度分布。第三个目标是确认通过运行预系列测试获得的性能的可重复性。

Pierre-Paul Beaulieu Equipment inc. is a company located in Bic (Quebec) and is specialized in the manufacture of motorized equipment such as snow blowers and peat harvesting equipment. Among the issues that the company has noted in recent years, the premature wear of bushings and grooves in low-alloy steels. Indeed, wear is a complex set of phenomena, leading to debris emission with loss of mass, ribs, shape, and accompanied by physical and chemical changes in surfaces. In addition, it does not generally vary in a progressive manner according to parameters such as speed, temperature or time. To remedy wear problems, it is necessary to rethink the choice of materials, review the design of mechanical components or resort to heat treatment processes to harden parts. Knowing that the design criterion can not be approached knowing that the part fulfills a very specific functionality, it is necessary to explore the materials and their heat treatment by opting for surface treatments using the laser process. It will be relevant to test several materials and retain those that offer technological and economic benefits. The main goal of this project is to conduct an experimental study to optimize the hardening of bushings and grooves in low-alloy steels for heavy industrial machinery. The first objective is to conduct a comprehensive study to identify the phenomena involved and the level of stresses and deformations generated during operation. The second objective is to propose a systematic study to detect the effects of the laser process parameters on the performances and to converge towards an optimal hardness profile by developing an adequate strategy. The third objective is to confirm the repeatability of the performances obtained by running a pre-series of tests.