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Surface Profiles and Residual Stresses on Laser Shocked Zone of Ti6Al4V Titanium Alloy

稀有金属材料与工程 2011年第S4期40卷 190-193页

作者： cao ziwen,gong shuili,zou shikun,che zhigang national key laboratory of high energy density beam processing technology,beijing aeronautical manufacturing technology research institute,beijing 100024,china beijing Aeronaut Mfg Technol Res Inst Natl Key Lab High Energy Dens Beam Proc Technol Beijing 100024 Peoples R China

The latest applications of laser shock processing were summarized in this paper,and laser peening with water confined layer has been applied to Ti6Al4V titanium alloy using Nd:glass pulse *** profile of plastic deformation and residual stresses on metal surface were studied with different laser power *** investigation results show that peak depth of plastic deformation is in linear proportion to laser power density (5.75GW/cm2 to 9.5 GW/cm2),and maximal surface compressive residual stress is up to 375MPa at 8.25GW/*** was ensured that the compressive residual stress field related to laser power density and shocked *** spot overlapping ratio of 33%,the circle spot can get a relative smooth *** strip with thickness 2.5mm was shocked as the preliminary verification test of residual stresses,and it is shown that excessive peening times is unavailable to thin-wall parts just as edge of fan blades.

关键词： laser shock processing Ti6Al4V surface profiles residual stresses

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Investigation of Surface Integrity on TC17 Titanium Alloy Treated by Square-spot Laser Shock Peening

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Chinese Journal of Aeronautics 2012年第4期25卷 650-656页

作者： cao ziwen XU Haiying zou shikun che zhigang national key laboratory of Science and technology on Power beam Processes Beijing Aeronautical Manufacturing Technology Research instituteBeijing 100024China

Laser shock peening（LSP） is an innovative surface treatment method,which has been shown to greatly improve the fatigue life of many metallic *** work investigates surface integrity of TC17 titanium alloy treated by LSP with innovative square laser ***：glass laser with duration of 30 ns and spot size of 4 mm×4 mm is *** surface morphology and surface residual stress of the TC17 titanium alloy,treated with varying peening parameters such as laser power density and overlapping ratio,have been studied in *** results show that laser pulse energy greatly influences surface morphology and surface residual stress around single-spot treated areas,and compressive residual stresses are saturated as laser pulse energy is over 55 *** are significantly different surface morphologies and residual stress distributions at the overlapped areas with different overlapping ratios.A relative smooth surface is produced with uniform compressive residual stress distribution at an overlapping ratio of 8 %.The experiment of residual stress relaxation is implemented by measuring residual stress at the center of four overlapped spots and by four point bending fatigue test at the frequency of 105 *** compressive residual stresses induced by LSP are found to relax quite slowly under cyclic fatigue loading.

关键词： laser shock peening square laser spot residual stresses titanium alloy shock wave

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