Semi-quantitative prediction and visualization method for mesoscopic stress and texture in alpha titanium deformation process

Abstract

The invention discloses a semi-quantitative prediction and visualization method for mesoscopic stress and texture in an alpha titanium deformation process, which belongs to the technical field of material plastic deformation. According to the method, the problem that mesoscopic stress is difficult to obtain by an existing simulation means or experimental method is solved, and the problems of high requirements and high cost of experimental characterization of the mesoscopic stress on equipment are avoided. According to the method, a representative volume element RVE is used as a carrier to establish a crystal plasticity model, a texture obtained through EBSD characterization or XRD measurement is imported into the representative volume element RVE, the representative volume element RVE is composed of a titanium alloy alpha phase and contains texture information of an original experimental material, slippage and twinning deformation behaviors of the alpha titanium alloy are considered in subsequent crystal plasticity simulation, mesoscopic stress and texture evolution information of the material under the action of various external loads can be obtained and visualized, and the method is of great importance to research on mesoscopic stress evolution in the alpha titanium alloy deformation process and initiation and expansion of cracks induced by mesoscopic stress.

Description

technical field [0001] The invention relates to a method for semi-quantitative prediction and visualization of mesoscopic stress and texture in the deformation process of alpha titanium, and belongs to the technical field of material plastic deformation. Background technique [0002] Due to the characteristics of low density, high specific strength, high temperature performance and excellent corrosion resistance, titanium alloy has broad application prospects in the aerospace field. Among them, α-titanium and near-α-titanium alloys mainly composed of α-phase have good toughness and high yield stress. However, the hexagonal close-packed (HCP) structure often causes a large number of plastic rheological inhomogeneities on the grain scale, which in turn causes the inhomogeneity of the mesoscopic (grain scale) stress field of the material, and the study of α The mesoscopic stress in the deformation process of titanium alloy components under external load is very important for t...

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Problems solved by technology

[0003] The present invention aims to solve the problem of the high cost of experimental measurement of the mesoscopic stress of α-titanium alloy by existing experimental techniques (X-ray micro-diffraction, electron backscattering diffraction technology, etc.), the difficulty in measuring the internal mesoscopic stress of the material, and the difficulty in realizing the weaving process of the α-titanium alloy deformation process. To solve problems such as the visualization of structural evolution, provide a semi-quantitative prediction and visualization method of mesoscopic stress and texture in the deformation process of α-Ti alloy based on representative volume elements

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