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连续激光冲击强化Al7050中厚板的过喷效应
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高能束流加工技术国家级重点实验室

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An over peening effect of Al7050 mid-thick plates with continued multiple laser shock peening at the same positions
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Science and Technology on Power Beam Processes Laboratory,AVIC Manufacturing Technology Institute

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    摘要:

    本文基于连续激光冲击强化7050铝合金中厚板的表面完整性和内部层裂,提出了一种激光冲击强化的过喷效应。7050铝合金中厚板尺寸为50 mm × 50 mm × 5 mm (长×宽×高)。激光工艺参数为激光能量30J,光斑尺寸4 mm × 4 mm,脉宽15ns和单点连续多次激光冲击(LSP-1~LSP-8)。表面形貌,表面残余应力,深度方向显微硬度和截面微观组织分别被超景深三维形貌仪,X射线衍射仪,显微硬度仪和金相显微镜测试分析。研究结果表明:单点连续5次激光冲击诱导7050铝合金中厚板表面微凹坑凸起高度为197.8 μm和山脊高度为130.8 μm。从单点连续4次激光冲击到单点连续5次激光冲击,试样表面残余应力由压应力转换为拉应力。单点连续5次激光冲击后,试样背层产生了低显微硬度的加工软化现象。单点连续5次激光冲击为7050铝合金中厚板的层裂阈值。研究结果有益于激光冲击强化工业应用中避免层裂和改善强化效果。

    Abstract:

    In this paper, an over peening effect was presented based on the researches of surface integrity and internal spall of Al7050 mid-thick plates with continued multiple laser shock peening (LSP) at the same positions. The dimensions of the samples were 50 mm × 50 mm × 5 mm (Length × Width × Thickness). Laser process parameters were laser energy of 30 J, square spots of 4 mm × 4 mm, pulse width of 15 ns and continued multiple LSP at the same positions (LSP-1~LSP-8). Surface morphology, surface residual stress, and micro-hardness in depth and cross-sectional microstructure were measured by Super depth 3D microscope system, X-ray diffraction instrument, Vickers indenter and Optical Microscope (OM), respectively. The results indicated that high micro-dent depressions of 197.8 μm and ridges of 130.8 μm were generated after continued LSP-5. Surface compressive residual stress changed into tensile residual stress from continued LSP-4 to continued LSP-5. After continued LSP-5, work soft with low micro-hardness was found in the bottom layer. Continued LSP-5 was the spall threshold of Al7050 mid-thick plates. The researched results can be beneficial to avoid the spall and improve the strengthening effect in an industry application of LSP.

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吴俊峰,邹世坤,巩水利,曹子文,车志刚,孙汝剑.连续激光冲击强化Al7050中厚板的过喷效应[J].稀有金属材料与工程,2020,49(10):3395~3401.[Wu Junfeng, Zou Shikun, Gong Shuili, Cao Ziwen, Che Zhigang, Sun Rujian. An over peening effect of Al7050 mid-thick plates with continued multiple laser shock peening at the same positions[J]. Rare Metal Materials and Engineering,2020,49(10):3395~3401.]
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  • 收稿日期:2019-09-30
  • 最后修改日期:2019-12-20
  • 录用日期:2020-01-03
  • 在线发布日期: 2020-11-04
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