Method and system for coordinated optimization of low-energy grain boundary density and grain size

Abstract

The invention discloses a coordinated optimization method and system for low-energy grain boundary density and grain size, and coordinates and optimizes thermoplastic deformation process parameters by introducing key evaluation index energy storage to obtain a uniformly refined structure with high low-energy grain boundary density; obtain the material to be tested Based on the isothermal thermal compression experimental data, the response relationship and model between energy storage and average grain size are established; the response relationship of low-energy grain boundary density with energy storage and average grain size as variables is established, and then the evolution model of low-energy grain boundary density is established; Develop a low-energy grain boundary density prediction and analysis system to obtain the core subroutines of grain size and low-energy grain boundary density and couple them to the finite element software. Through real-time monitoring of average grain size, energy storage and low-energy grain boundary density, iterative correction The main process parameters realize the dynamic coordination and optimization between grain size and low-energy grain boundary density. The invention can reveal the evolution of the low-energy grain boundary density in the process of thermoplastic deformation, and realize the coordinated optimization of the low-energy grain boundary density and grain size.

Description

technical field [0001] The invention belongs to the invention patent and belongs to the field of metal plastic forming in material processing engineering. Background technique [0002] Nickel-based superalloys are superalloys with low stacking fault energy, and low-energy grain boundaries Σ3 n (n=1,2,3) Low grain boundary content will aggravate grain boundary crack propagation, while high content, uniformly refined Σ3 n The grain boundary can fully crack the free grain boundary network and effectively prevent the formation and expansion of cracks, thereby significantly improving the fatigue resistance and creep performance of the alloy, and solving the problems caused by the low cracking degree of the grain boundary network of the nickel-based superalloy valve billet. The problem of engine power drop and even sudden destruction is of great significance. However, apart from the traditional trial-and-error method, there is no effective method to monitor the content and distr...

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Problems solved by technology

[0004] Aiming at the deficiencies of the above-mentioned technologies, the present invention provides a coordinated optimization method of low-energy grain boundary density and grain size, and solves how to find suitable thermoplastic deformation parameters in the thermoplastic processing process of metal materials to realize low-energy grain boundary density control and grain size. Technical Problems of Coordinated Optimization of Dimensions

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