Comparison of residual stress before and after shot peening on the surface of a Ti-6A1-4V titanium alloy by μ-X360n equipment

摘要

This comparison study is on the residual stress of a Ti-6A1-4V titanium alloy before and after shot peening. The Ti-6A1-4V titanium alloy is one of the most widely used materials due to a very good comprehensive performance. Testing the titanium alloy reveals that it adopts a Cu Ka for the target material because it has a strong diffraction peak under the crystal surface (213). The equipment used is the two-dimensional surface diffraction method to test the stress of the Ti-6A1-4V titanium alloy. The two-dimensional surface agent contains a detector and the detector consists of a complete probe. The core component of the detector is greater than 2 inches in diameter and the size of the detector determinesits ability to collect the diffraction signal; the greater the acquisition ability, the stronger it is. This piece of equipment is currently the most advanced full two-dimensional piece of equipment. The residual stress in the x-direction on the upper surface of the Ti-6A1-4V titanium alloy before shot peening is 296 Mpa and the error is 12 Mpa. The residual stress in the y-direction was 106 MPa and the error was 16 Mpa. The residual stress on the surface x-direction of the Ti-6A1-4V titanium alloy after shot peening was-532 Mpa and the error was 27 Mpa. The residual stress in the y-direction was-87 Mpa and the error was 32 Mpa. The measurement results indicate that the stress orientation is not uniform and that there was an obvious texture. On the surface of the Ti-6A1-4V titanium alloy, the residual stress in the x-direction of the upper surface is-532 Mpa, which is consistent with the theory and principle. The two-dimensional detector needs only one exposure to get the complete material Debye ringaccording to the integrity of the Debye ring and its intensity distribution characteristics. It can be concluded that the Ti-6A1-4V titanium alloy has a texture after shot peening. The stress change principle of the Ti-6A1-4V titanium alloy was compared from tensile stress to compressive stress, before and after the shot peening treatment.