Effects of high-energy laser peening followed by pre-hot corrosion on stress relaxation, microhardness, and fatigue life and strength of single-crystal nickel cmsx-4® superalloy

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SUMMARY

    Laser irradiances ranging from 4 to 10 GW/cm2 were used in the initial laser peening and stress evaluations, and then an irradiance of 7 GW/cm2 was chosen for treatment of fatigue test specimens with the purpose of maximising compressive residual stress. The irradiance range used was based on matching the reported yield stress to the calculated pressure generated by the laser peening of materials previously peened and evaluated, but importantly matched to the stiffness (moment of inertia) of the test specimen so as to maximise depth and intensity of residual stress by . . .

     

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