Constitutive behavior construction method for multiphase metal material for high-speed deformation process

Abstract

The invention discloses a rapid calculation method for constitutive behaviors of a multi-phase metal material for a high-speed deformation process. The method comprises the steps: predicting the mechanical behavior of each single pure phase in the multi-phase material through a crystal plasticity finite element method, and then predicting the macroscopic constitutive behavior shown by the materialin the multi-phase state through metallographic structure measurement and proportional mixing methods. The method can accurately and quickly predict the mechanical behavior of a single phase of the material in a high strain rate state, so that the method can be suitable for deformation processes such as high-speed machining and forging of steel, titanium alloy and other materials with complex phase components. According to the method, the problem that for the same material, after different heat treatments, the mechanical properties are significantly changed due to microstructure changes and the mechanical behaviors of the material need to be measured again is solved, so the cost can be significantly reduced in industrial production practice, the simulation and analysis efficiency can be improved, and the method has important significance for computer-aided analysis and design of the part machining deformation process.

Description

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

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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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