Research On Mechanical Properties And Corrosion Resistance Of Brass By Laser Shock Processing

Laser shock processing technology is made by high energy plasma shock wave effect on metal target surface,inducing high strain rate of target material surface plastic deformation,thus strengthened after the target material,the technology has advantages of green cost low efficiency higher current copper alloy.At present,the application range of copper alloy is very wide,but the performance of the raw materials is difficult to meet the requirements for the production and application of products in modern society,so need to re-process the copper alloy to improve its practical application capacity.In this paper,the strengthening process and strengthening mechanism of brass sample by laser impingement are studied by the method of combining numerical simulation and experiment,and the corrosion resistance and mechanical properties of brass sample are improved by laser impingement.Firstly,the propagation and effects of laser-induced plasma shock wave are introduced,a theoretical model is established for laser shock intensification,and the parameters of the shock process are set,which provides a theoretical basis for the numerical simulation.At the same time,using ANSYS finite element analysis platform to establish a single point laser shock processing simulation model and completed the pre-processing module settings.Secondly,the experimental platform of laser shock strengthening was built,the plastic deformation process of laser strengthening was explored by adjusting experimental parameters(different laser energies),and the influence law of laser energy on the strengthening effect was analyzed.The mechanical properties of brass surface were improved by laser shock processing,and a layer of reinforcement was formed on the surface of brassThen,cavitation corrosion resistance of the brass was studied and the cavitation resistance of brass was characterized by cumulative mass loss,profile curve and surface morphology.The strengthened layer produced by laser shock processing can effectively alleviate the diffusion of cavitation crack,thus improve the cavitation resistance of brass.Finally,a series of combination property test experiments were designed to explore the impact of laser shock processing on the surface of brass.The experimental results of laser shock processing under different energies were compared,and it was concluded that laser shock processing can improve corrosion resistance,abrasion resistance and tensile strength on the surface of brass.In addition,the results of cavitation electrochemical experiments shows that the microjet has a strong effect on brass surface.There are 47 figures,7 tables and 96 references in this paper.