Residual Stress Distribution of TC4 Titanium Alloy Plate after Continuous Laser-Assisted Laser Shock Peening
The TC4 titanium alloy plate was strengthened by continuous laser heating the back face assisted pulsed laser shock peening the front face under different continuous laser pouer(40‒100 W).The effects of continuous laser-assisted peening on the temperature,phase,hardness and residual stress distribution in depth direction of TC4 titanium alloy plate were studied by comparing with those of unstrengthened and traditional laser shock peening samples.The results show that with the increase of continuous laser power,the temperature on the back face of the samples increased linearly,and the temperature on the front face increased but the increase rate became slow and tended to be stable.The temperature increase did not cause the phase transformation of TC4 titanium alloy.Compared with those of the unstrengthened and laser shock peening samples,the front face hardness,the surface residual compressive stress and residual compressive stress affected depth of the continuous laser-assisted laser shock peening sample increased.The hardness of the sample was not affected by continuous laser powder,but the residual compressive stress and residual compressive stress affected depth increased and then decreased with the increase of the continuous laser power,reaching the maximum values when the continuous laser power was 60 W,which were 431.4 MPa,470 µm,respectively.
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