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連續(xù)激光沖擊強化Al7050中厚板的過噴效應
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高能束流加工技術國家級重點實驗室

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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:

    本文基于連續(xù)激光沖擊強化7050鋁合金中厚板的表面完整性和內部層裂，提出了一種激光沖擊強化的過噴效應。7050鋁合金中厚板尺寸為50 mm × 50 mm × 5 mm （長×寬×高）。激光工藝參數為激光能量30J，光斑尺寸4 mm × 4 mm，脈寬15ns和單點連續(xù)多次激光沖擊（LSP-1~LSP-8）。表面形貌，表面殘余應力，深度方向顯微硬度和截面微觀組織分別被超景深三維形貌儀，X射線衍射儀，顯微硬度儀和金相顯微鏡測試分析。研究結果表明：單點連續(xù)5次激光沖擊誘導7050鋁合金中厚板表面微凹坑凸起高度為197.8 μm和山脊高度為130.8 μm。從單點連續(xù)4次激光沖擊到單點連續(xù)5次激光沖擊，試樣表面殘余應力由壓應力轉換為拉應力。單點連續(xù)5次激光沖擊后，試樣背層產生了低顯微硬度的加工軟化現象。單點連續(xù)5次激光沖擊為7050鋁合金中厚板的層裂閾值。研究結果有益于激光沖擊強化工業(yè)應用中避免層裂和改善強化效果。

    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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吳俊峰,鄒世坤,鞏水利,曹子文,車志剛,孫汝劍.連續(xù)激光沖擊強化Al7050中厚板的過噴效應[J].稀有金屬材料與工程,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.]
DOI：10.12442/j. issn.1002-185X.20190806

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  • 收稿日期:2019-09-30
  • 最后修改日期:2019-12-20
  • 錄用日期:2020-01-03
  • 在線發(fā)布日期: 2020-11-04
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