Laser hardening development

激光硬化发展

• 批准号: 488676-2015
• 负责人: Khajepour, Amir
• 金额: $ 1.82万
• 依托单位: University of Waterloo
• 依托单位国家: 加拿大
• 项目类别: Engage Grants Program
• 财政年份: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=586362
• 关键词: Laser; hardening; development

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.

激光可用于机器部件和工具的局部热处理，以提高硬化或耐磨性。Waterloo大学在先前的工作中开发了一种用于激光材料加工技术的实时微结构控制器，本项目旨在研究该技术在激光硬化及其真实的时间控制中的应用。 具有精确硬化深度的激光材料加工的高加工速度将通过短的冷却时间提供细晶粒马氏体显微组织。与传统的表面硬化方法相比，激光硬化具有以下优点：改善表面性能;缩短周期时间;将硬化工艺集成到现有生产线中;降低热变形;灵活处理复杂几何形状;提高温度控制;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。工艺参数，包括激光功率，激光焦点，旅行速度，和强制冷却机制进行了研究，以表征硬化和其深度穿透。将研究不同类型的钢如AIS 1030、1050、5140、8630或9310在具有紧密定位槽和交叉油孔的轴中的表面性质变化。此外，在不同条件下的冷却速率和相变进行了评估。将进行试验以研究激光束硬化部件与其显微组织和硬度分布相关的机械性能。