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Improvement of fatigue life of Ti-6Al-4V alloy by laser shock peening

机译：激光冲击喷丸改善Ti-6Al-4V合金的疲劳寿命

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摘要

The aim of this paper was to address the effects of multiple laser peening and laser peening intensity used in laser shock peening (LSP) on the residual stress, micro-hardness and three-point bending fatigue performance of Ti-6Al-4V alloy. The multiple laser peening was accomplished by using the successive laser shocks at the same spot and the laser peening intensity was changed through changing the number of overlapped laser spots. The microstructure, which was characterized by highly tangled and dense dislocation arrangements due to high strain rate, can be found near the surface of the laser-peened specimen. By comparing with the as-received specimen, high micro-hardness and compressive residual stress were introduced at the surface of the laser-peened specimen. With increasing the number of overlapped laser spots, the fatigue life of the laser-peened specimen increased, reached a local maximum and then decreased. The specimen treated by using three overlapped laser spots exhibited the highest fatigue life. When the number of overlapped laser spots was kept to be three, the LSP treatments with one single laser shock and two successive laser shocks respectively provided a 22.2% and 41.7% increase in the fatigue strength as compared with the as-received specimens.
机译：本文旨在探讨激光冲击喷丸（LSP）中使用的多次激光喷丸和激光喷丸强度对Ti-6Al-4V合金的残余应力，显微硬度和三点弯曲疲劳性能的影响。多次激光喷丸是通过在同一点使用连续的激光冲击来完成的，并且通过改变重叠激光点的数量可以改变激光喷丸的强度。显微组织的特征是由于高应变速率而导致高度纠结和致密的位错排列，可以在激光喷丸试样的表面附近找到。通过与原样比较，将高显微硬度和压缩残余应力引入经激光喷丸处理的试样表面。随着重叠激光点数量的增加，激光喷丸试样的疲劳寿命增加，达到局部最大值，然后降低。使用三个重叠的激光光斑处理的样品具有最高的疲劳寿命。当重叠激光点的数量保持为三个时，与一次接收的样品相比，一次激光冲击和两次连续激光冲击的LSP处理分别使疲劳强度提高了22.2％和41.7％。

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  • 来源
    《Materials Science and Engineering》 |2010年第15期|p.3411-3415|共5页
  • 作者

    X.C. Zhang; Y.K. Zhang; J.Z. Lu; F.Z. Xuan; Z.D. Wang; S.T. Tu;

  • 作者单位

    Key Laboratory of Safety Science of Pressurized System, MOE, East China University of Science and Technology, Shanghai, 200237, PR China;

    School of Mechanical Engineering, Jiangsu University, Xuefu Road 301, Jingkou District, Zhenjiang 212013, PR China;

    School of Mechanical Engineering, Jiangsu University, Xuefu Road 301, Jingkou District, Zhenjiang 212013, PR China;

    Key Laboratory of Safety Science of Pressurized System, MOE, East China University of Science and Technology, Shanghai, 200237, PR China;

    Key Laboratory of Safety Science of Pressurized System, MOE, East China University of Science and Technology, Shanghai, 200237, PR China;

    Key Laboratory of Safety Science of Pressurized System, MOE, East China University of Science and Technology, Shanghai, 200237, PR China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    laser shock peening; multiple laser peening; residual stress; fatigue life; fatigue strength;

    机译：激光冲击喷丸;多次激光喷丸;残余应力疲劳寿命疲劳强度;

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