Prediction method for microstructure evolution of shot peening strengthening material

Abstract

The invention discloses a prediction method for microstructure evolution of a shot peening strengthening material. The prediction method comprises the following steps: 1, establishing a three-dimensional shot peening model by using an ABAQUS platform; 2, embedding a constitutive equation based on dislocation density evolution into the shot peening strengthening three-dimensional model; 3, measuring the radius of the crater; 4, calculating the number of shots required in a unit area when the shot blasting coverage rate reaches a set value; 5, establishing a shot peening strengthening three-dimensional model with multiple randomly distributed shots; and 6, analyzing the process that the projectile flow impacts the target body by using an ABAQUS / Express solver, and calculating to obtain the dislocation cell size and the dislocation density distribution. The method has the technical effects that under the condition of considering the relationship between the macroscopic stress-strain fieldand the microstructure of the material, the evolution data of the microstructure of the material by different shot peening strengthening parameters is obtained, the understanding of shot peening process parameters is deepened, the shot peening process parameters are optimized, and the shot peening strengthening treatment effect is improved.

Description

technical field [0001] The invention belongs to the technical field of metal material processing, and specifically relates to a method for predicting the evolution of residual stress and material microstructure after shot peening on the surface of metal parts, and also relates to a method that considers the relationship between the macroscopic stress-strain field and the material microstructure. A method for predicting the surface dislocation density distribution gradient and dislocation cell size distribution gradient of metal parts after shot peening. Background technique [0002] As a typical surface strengthening technology, shot peening has the characteristics of high efficiency, low energy consumption and remarkable strengthening effect. It is widely used in the surface strengthening of metal parts in wind power, ships, automobiles, aviation and other industries. . After the surface of metal parts is shot peened, plastic deformation occurs on the surface. Under the ac...

AI Technical Summary

Problems solved by technology

However, due to the high cost of the test, it is difficult to popularize the observation of the microstructure of the shot-peened material in the engineering field.

Therefore, in actual engineering, there are still insufficient mechanisms for refining the structure of materials after shot peening, which leads to the difficulty of rationally selecting shot peening process parameters due to the effect of shot peening.

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