A method for constructing the constitutive behavior of multiphase metallic materials for high-speed deformation process

Abstract

The invention discloses a fast calculation method for the constitutive behavior of multi-phase metal materials facing high-speed deformation process. The mechanical behavior of each single pure phase in the multi-phase material is predicted by the crystal plasticity finite element method, and then the mechanical behavior of each single pure phase in the multi-phase material is predicted by the metallographic structure measurement, The proportional mixing method predicts the macroscopic constitutive behavior exhibited by the material in the multiphase state. This method can accurately and rapidly predict the mechanical behavior of a single phase of the material under high strain rate state, so it can be applied to high-speed machining, forging and other deformation processes involving steel, titanium alloy and other materials with complex phase composition. This method avoids the need to re-measure the mechanical behavior of the material due to the significant change in the mechanical properties after different heat treatments for the same material. In practical industrial production, it can significantly reduce costs and improve simulation and analysis efficiency. Computer-aided analysis and design of part machining deformation process is of great significance.

Description

technical field [0001] The invention belongs to the field of high-speed deformation and processing of multi-phase metal crystal materials, and particularly relates to a method for constructing the constitutive behavior of multi-phase metal materials for high-speed deformation process. Background technique [0002] The constitutive model is a mathematical model used to describe the response of the flow stress of the material to the deformation state under the applied boundary conditions, which can reflect the basic deformation state of the material. To understand the deformation process of the material such as cutting and forging, the computer is used to assist the process. Design is very important. At the same time, the microstructure of the material also has a very important influence on the macroscopic physical and mechanical properties. For the same material, different heat treatments will lead to different microstructures, resulting in significant differences in the mech...

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Problems solved by technology

[Rodriguez R, Gutierrez I. Mechanical behavior of steels with mixed microstructures. Proceeding of TMP 2004; 4:356–63.; Kadkhodapour J, Butz A, Ziaei-Rad S, Schmauder S. A micro mechanical study on failure initiation of dualphase steels under tension using single crystal plasticity model. International Journal of Plasticity 2011; 27:1103–25.] However, this method can only consider the constitutive behavior of single-phase materials under quasi-static loading conditions. For high-speed machining, forging and other processes, the commonly used Engineering materials have a relatively complex phase composition, and the strain rate is large and the temperature is high during the deformation process, and the effect of strain rate and temperature will have a significant impact on the actual constitutive behavior of the material

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