Study on surface integrity control and anti-fatigue mechanism of gas turbine blade precision grinding
Provincial Natural Science Foundation Exploration Project
Gas turbines are widely used in aircraft, ships and other fields, and usually work under extreme conditions of high temperature, high pressure, high load, high corrosion and drastic changes in working conditions, which are prone to fatigue failure. Blade is the core component of gas turbine, and its surface integrity control has an important impact on its working performance and service life. In this project, the precision grinding process experiment and simulation are carried out for typical complex structural parts of gas turbine blades, and the mechanism of material-abrasive interaction, temperature field, stress-strain field and heat/force coupling of precision grinding, surface burn and surface microstructure, microhardness and residual stress formation during precision grinding are studied. The influence of surface integrity on fatigue is studied through experiments and tests, and the influence of stress concentration on fatigue strength is analyzed. The fatigue failure mechanism is analyzed by port morphology and fatigue simulation model, and finally the process control method of fatigue constraint is obtained, so as to improve the fatigue resistance of gas turbine blades after grinding.
