Method for constructing deformation resistance models of material

Abstract

The invention provides a method for constructing deformation resistance models of a material. The method includes the steps of obtaining a flow stress curve of the material and a relationship curve between work hardening rate and stress through an isothermal compression simulation experiment; leading out a straight line parallel to the initial segment of a stress-strain curve from a position witha strain of 0.002, and determining yield stress and strain by use of the coordinates of the intersection point of the straight line and the stress-strain curve; and dividing the curve into three types, constructing the deformation resistance models in segments according to the three types of curves, according to the characteristic values corresponding to identified critical points, peak points andstable points, finding out the relationship between the characteristic values and parameters, combining formulas to obtain the relationship formula between each characteristic value and deformation rate and temperature, and substituting the obtained result into a deformation resistance calculation formula to construct the required deformation resistance models. The method divides the deformationresistance models in segments according to different stages of tissue change of the material, so that different stages of the tissue change correspond to different deformation resistance models, thusthe calculation accuracy of rolling force can be effectively improved.

Description

technical field [0001] The invention belongs to the field of thermal processing of materials, in particular to a method for constructing a material deformation resistance model. Background technique [0002] During the rolling process, the material mainly undergoes microstructure evolution and shape changes. During this process, the deformation resistance of the material undergoes a series of changes. In formulating the rolling process system, fully and rationally tapping the potential of equipment, and conducting new product research and development, it is first necessary to determine the rolling force, that is, the deformation resistance of the material. Therefore, the high temperature deformation resistance model of metal materials is the premise of material processing design. At present, the rolling force prediction generally adopts physical simulation experiments to obtain the flow stress curve of the material under different deformation conditions. Based on the curve ...

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Problems solved by technology

However, neither of them considered the stage of structural change that the material undergoes during thermal processing, and the internal changes of the material will have a direct impact on its deformation resistance, which will inevitably cause deviations in the calculation results. Therefore, it is necessary to construct the deformation In the resistance model, the changes in the material internal during the deformation process are taken into account, so that the established model can give more accurate results

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