激光冲击强化技术原理及研究发展

发布时间：2018-02-06 06:22

本文关键词： 激光冲击强化表面处理残余应力层纳米晶等离子体冲击波塑性变形　出处：《光电工程》2017年06期 　论文类型：期刊论文

【摘要】：激光冲击强化技术(LSP)是一种新型的激光应用表面处理技术。与传统表面改性技术相比,激光冲击强化技术能给材料带来更深的残余应力层,使材料表层晶粒细化甚至出现纳米晶,同时大幅提高材料的疲劳寿命。利用高能激光辐照约束层材料(黑漆、黑胶带或铝箔),约束层材料在瞬间熔融气化并产生高温高压的等离子体。等离子体冲击波是一种爆轰波,可以通过C-J模型计算冲击波的峰值压力。等离子体冲击波在约束层(水、光学玻璃)的约束下向材料内部传播,其压力远远超过了材料的弹性屈服极限,材料经历了弹性-塑性变形,最终材料表面形成稳定的残余应力场并发生微弱的塑性变形。本文介绍了激光冲击强化技术的研究发展历程,在此基础上对该技术发展方向进行了展望。
[Abstract]:Laser shock hardening (LSP) is a new type of laser surface treatment technology. Compared with the traditional surface modification technology, laser impact strengthening technology can bring deeper residual stress layer to the material. The surface grain of the material is refined and even nanocrystalline appears, and the fatigue life of the material is greatly improved. The high energy laser irradiation is used to restrain the material (black lacquer, black tape or aluminum foil). Plasma shock wave is a kind of detonation wave. The peak pressure of the shock wave can be calculated by C-J model. The plasma shock wave propagates to the material under the confinement layer (water, optical glass), and its pressure far exceeds the elastic yield limit of the material. The material experienced elastic-plastic deformation, and the surface of the material formed a stable residual stress field and a weak plastic deformation. In this paper, the research and development of laser impact strengthening technology is introduced. On this basis, the development direction of the technology is prospected.
【作者单位】：东北大学机械工程与自动化学院;中国科学院沈阳自动化研究所装备制造技术研究室;
【基金】：国家自然科学基金(2015020115)资助项目国家重大专项(U1608259)
【分类号】：TN249

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