Research On Shot Peening Technology Of TB6Titanium Alloy

The fatigue performance of the titanium alloy is one of the important factors affecting itsservice life. Laser shock peening (LSP) has been developed, as a new surface strengtheningtechnology, which can improve not only residual stress, but also a deeper residual stress layer on thesurface of the workpiece, so it has great value of application in the aerospace field.In this paper, the stress wave and residual stress field induced by laser shock peening (LSP) andshot peening (SP) and the experiment were theoretically, numerically and experimentally studied forTB6titanium alloy. The mechanical behavior of laser shock peening (LSP) and shot peening (SP)was studied based on the theory of stress wave and impact dynamics theory. Comparing the twokinds of shot peening process, the following features were obtained, a plane stress wave wasproduced by laser shock peening (LSP), a spherical wave was produced by shot peening (SP), theenergy of laser shock peening (LSP) is concentrated, and the stress-affected layer is deep， theenergy of shot peening(SP) is dispersive, and the stress-affected layer is not deep; The finite elementmodels for laser shock peening (LSP) and shot peening (SP) were established, comparing the plasticstrain and residual stress of the two kinds of shot peening process, the results indicate that the plasticstrain and residual stress of shot peening (SP) is stronger than laser shock peening (LSP); Theinfluence law of different process parameters were obtained; the effects of laser and shot peeningcomposite processing were studied by the finite element method in this paper, the results indicatethat the composite process can obtain larger surface compressive residual stress and deeperstress-affected layer at the same time; the microhardness, microstructure and surface morphologywere studied in this paper, the variational law of the microhardness was the same as plastic strain; inthe affected area by plastic strain, the grain is refined; laser shock peening formed surface roughnessis less than shot peening.