Modeling and FE Simulation of Quenchable High Strength Steels Sheet Metal Hot Forming Process |
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Authors: | Hongsheng Liu Jun Bao Zhongwen Xing Dejin Zhang Baoyu Song Chengxi Lei |
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Affiliation: | (1) Department of Mechatronics Engineering, Harbin Institute of Technology, P.O. Box 425, Harbin, 150001, People’s Republic of China |
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Abstract: | High strength steel (HSS) sheet metal hot forming process is investigated by means of numerical simulations. With regard to
a reliable numerical process design, the knowledge of the thermal and thermo-mechanical properties is essential. In this article,
tensile tests are performed to examine the flow stress of the material HSS 22MnB5 at different strains, strain rates, and
temperatures. Constitutive model based on phenomenological approach is developed to describe the thermo-mechanical properties
of the material 22MnB5 by fitting the experimental data. A 2D coupled thermo-mechanical finite element (FE) model is developed
to simulate the HSS sheet metal hot forming process for U-channel part. The ABAQUS/explicit model is used conduct the hot
forming stage simulations, and ABAQUS/implicit model is used for accurately predicting the springback which happens at the
end of hot forming stage. Material modeling and FE numerical simulations are carried out to investigate the effect of the
processing parameters on the hot forming process. The processing parameters have significant influence on the microstructure
of U-channel part. The springback after hot forming stage is the main factor impairing the shape precision of hot-formed part.
The mechanism of springback is advanced and verified through numerical simulations and tensile loading-unloading tests. Creep
strain is found in the tensile loading-unloading test under isothermal condition and has a distinct effect on springback.
According to the numerical and experimental results, it can be concluded that springback is mainly caused by different cooling
rats and the nonhomogengeous shrink of material during hot forming process, the creep strain is the main factor influencing
the amount of the springback. |
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