Semi-quantitative prediction and visualization of mesoscopic stress and texture during deformation of alpha titanium

Abstract

The invention discloses a semi-quantitative prediction and visualization method of mesoscopic stress and texture in the deformation process of alpha titanium, and belongs to the technical field of material plastic deformation. The invention solves the problem that the existing simulation means or experimental method is difficult to obtain the mesoscopic stress, and avoids the high requirements and high cost of equipment for the experimental characterization of the mesoscopic stress. In this application, the representative volume element RVE is used as a carrier to establish a crystal plasticity model, and the texture obtained by EBSD characterization or XRD measurement is imported into the representative volume element RVE. The representative volume element RVE is composed of titanium alloy α phase and contains the texture information of the original experimental material. The subsequent crystal plasticity simulation takes into account the slip and twinning deformation behavior of α titanium alloy, and can obtain and visualize the mesoscopic stress and texture evolution information of the material under various external loads. The evolution of microscopic stress and the initiation and propagation of mesoscopic stress-induced cracks are crucial.

Description

technical field [0001] The invention relates to a semi-quantitative prediction and visualization method 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] Titanium alloys have broad application prospects in the aerospace field due to their low density, high specific strength, high temperature performance and excellent corrosion resistance. Among them, alpha titanium and near-alpha titanium alloys mainly composed of alpha 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, and the plastic rheological inhomogeneity 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 ...

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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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