激光喷丸强化6061-T6铝合金板料的表面完整性研究  

Study on Surface Integrity of 6061-T6 Aluminum Alloy Sheet after Laser Shot Peening

作　　者：黄舒[1] 周建忠[1] 孙月庆[1] 陈毅彬[1] 蒋素琴[1] 

机构地区：[1]江苏大学机械工程学院,江苏镇江212013

出　　处：《应用激光》2007年第6期450-455,共6页Applied Laser

基　　金：国家自然科学基金项目(项目编号:50675090;50475127);江苏省自然科学基金(项目编号:BK2004063);教育部科学技术研究重点项目(项目编号:204052)

摘　　要：采用数值模拟和实验相结合的方法研究了6061-T6航空铝合金板料经激光喷丸强化后表面形貌、表面粗糙度、表面硬度、残余应力、表面显微组织结构等表面完整性的变化。结果表明:激光喷丸后,试样表面喷丸区域的粗糙度降低;激光喷丸过程中冲击波诱导表面显微组织发生变化,位错密度增加,从而使得硬度增加,表面抗塑性变形能力得到提高;受喷板料正反两面均呈现残余压应力分布,最大残余应力值位于喷丸区域表面,厚度方向残余压应力随深度增加而逐渐减小。数值模拟得到的表面微凹坑截面轮廓及残余应力分布与实验结果相一致,表明可以用数值模拟方法对表面完整性进行预测,为激光喷丸过程参数优化和表面质量有效控制提供依据。Numerical simulation and experiments are used to study the variation of surface integrity characteristics such as to pography, roughness, hardness, residual stress and microstructure of surface on 6061-T6 aluminum alloy sheet after laser shot peening（LSP）. The results indicate that the roughness of surface decreased compared with the base after LSP. The transient shock waves induce microstructure changes near the surface, which cause high density of dislocations and increment of hardness to be formed, so the resistance to plastic deformation is increased. Both sides of sheet metal exist compressive residual stress, and the maximum compressive residual stress is formed on the surface of work piece and decreases in magnitude with increasing depth below the surface. The results gained from numerical simulation show good agreement with experiment, so the simulation method can be used to predict surface integrity caused by LSP, which can offer theoretic basis for optimizing parameters and controlling surface quality effectively during laser shot peening.

关 键 词：表面完整性 激光冲击强化 残余应力 数值模拟 

分 类 号：TN249[电子电信—物理电子学]