Laser hardening development

激光可用于机械部件和工具的局部热处理，以提高硬化或耐磨性。滑铁卢大学在前期的工作中开发了一种激光材料加工技术的实时显微组织控制器，本项目旨在研究该技术在激光硬化中的应用及其实时控制。 激光材料加工的高处理速度和精确的硬化深度将通过较短的冷却时间提供细晶马氏体微组织。与传统的表面强化方法相比，激光强化具有以下优点：改善表面性能；缩短周期；将强化过程集成到现有生产线中；低热变形；复杂几何形状的加工灵活性；更高的温度控制；以及减少与冷却介质相关的环境排放。 在这个项目中，我们将研究使用激光材料加工的凸轮轴组件的热处理。研究了激光功率、激光焦点、行程速度和强制冷却机制等工艺参数对强化和深度穿透的影响。将研究不同类型的钢，如AIS 1030、1050、5140、8630或9310，用于具有近距离凹槽和交叉油孔的轴的表面性能变化。此外，还对不同条件下的冷却速度和相变进行了评估。将进行试验，研究激光淬火零件的机械性能与其显微组织和硬度分布的关系。

A laser can be used for localized heat treatment of machine components and tools for improving hardening or wear resistance. A real-time microstructure controller for laser materials processing technology has been developed in prior work at the University of Waterloo and this project is intended to study the application of this technique to laser hardening and its real time control. High processing speeds of laser materials processing with precise hardening depths will provide fine grained martensite microstructures through short cooling times. Compared to conventional surface hardening methods, laser hardening offers: improved surface properties; short cycle times; integration of the hardening process into existing production lines; low heat distortion; process flexibility for complex geometries; higher temperature control; and reduced environmental emissions related to cooling media. In this project, we will look into heat treatment of a camshaft assembly using laser materials processing. Process parameters including laser power, laser focal point, travel speed, and forced cooling mechanisms are studied to characterize the hardening and its depth penetration. Surface property variations in different types of steels such as AIS 1030, 1050, 5140, 8630, or 9310 used in shafts with close located grooves and cross oil holes will be investigated. In addition, cooling rates and phase transformations under different conditions are assessed. Tests will be conducted to study mechanical properties of the laser beam hardened parts in relation to their microstructure and hardness distribution.