Prediction method for aluminum alloy thermal deformation behaviors and yield strength after forming

Abstract

The invention relates to a prediction method for aluminum alloy thermal deformation behaviors and yield strength after forming. The prediction method comprises the following steps that S1, solving a constitutive model of the aluminum alloy through tensile data; S2, converting the engineering stress-strain curve into a real stress-strain curve; S3, establishing a unified viscoplasticity constitutive model of the aluminum alloy to obtain the dislocation density and hardening of the aluminum alloy in the deformation process and the relationship between the grain size and the viscoplasticity flow behavior; S4, making DSC analysis on the deformed aluminum alloy; S5, making XRD analysis of deformed aluminum alloy; S6, obtaining the element concentration, the precipitated phase volume fraction and the precipitated phase size according to the calculation result; S7, establishing a yield strength prediction model; and S8, solving model parameters. The calculation and analysis process involved in the method is simple, parameters are few, application and popularization are convenient, the model precision is high, and verification can be conducted through an aluminum alloy hot stamping experiment.

Description

Technical field[0001]The present invention relates to the field of aluminum alloy processing forming, and more particularly to a prediction method of aluminum alloy heat deformation behavior and post-forming yield strength.Background technique[0002]With the urgent needs of energy conservation emission reduction, light quantification has become an irreversible trend of today's automobile industry. As an important high-strength lightweight material, aluminum alloy is in the automotive industry with its high specific intensity and recycling rate. It has been more and more widely used. However, aluminum alloy limits its application in the automotive industry at room temperature. In order to overcome this problem, a new thermal stamping process, the thermal forming-quenching integrated process (HFQ) is proposed. During this process, the aluminum alloy sheets are subjected to a solution treatment to obtain a micro-tissue having a good delay. Then transfer to the water-cooling mold for fas...

AI Technical Summary

Problems solved by technology

However, currently published models cannot be directly used to predict the post-forming strength of workpieces manufactured by complex processes such as rapid heating and hot / warm stamping

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