Simulation method for residual stress prediction of micro-milling nickel-based superalloy

Abstract

The invention provides a simulation method for residual stress prediction of micro-milling nickel-based superalloy, belongs to the field of finite element simulation cutting, and relates to a finite element simulation method for residual stress prediction analysis in the cutting processing process of difficult-to-process materials of the nickel-based superalloy. According to the simulation method, the finite element simulation method is used; the elastic-plastic constitutive relationship of materials is considered; and a Johnson-Cook fracture failure criterion is used for judging the failure, so that residual stress prediction values under different cutting parameters can be obtained. A micro-milling cutter for experiments is shot into a picture through a scanning electron microscope; the picture is drawn into a micro-milling cutter solid model through software; a three-dimensional processed workpiece model is built; and the model is subjected to lattice division. The method has the advantages that the surface residual stress can be measured, and the residual stress in the depth direction can also be measured, so that the problem of measurement difficulty of the residual stress in the depth direction in the measurement process is solved. The cost is reduced, and the labor is saved. In a prediction model, the cutting parameters are variable; and the prediction on the surface residual stress of the difficult-to-process materials is effectively realized.

Description

technical field [0001] The invention belongs to the field of finite element simulation cutting, and relates to a finite element simulation method for predicting and analyzing residual stress in the cutting process of nickel-based superalloy, which is a difficult-to-machine material. Background technique [0002] Nickel-based superalloy has high tensile strength, fatigue strength, creep strength and fracture strength at 700°C, high oxidation resistance at 1000°C, stable chemical properties at low temperatures, and good welding performance , are widely used in various high-demand occasions. Such as steam turbines, nuclear power plants, acid environments, liquid fuel rockets, etc. In these applications, the fatigue strength, stress corrosion resistance and high temperature oxidation resistance of nickel-based superalloys are largely determined by the residual stress in the surface integrity of its machined parts. Different processing methods will produce different residual st...

AI Technical Summary

Problems solved by technology

Because the 2D simulation cannot truly reflect the actual machining conditions, the simulation results are difficult to match the actual cutting process, and some cutting parameters cannot be considered when the actual 3D machining is simplified to 2D machining

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