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Kinetic Model for the Phase Transformation of High‑Strength Steel Under Arbitrary Cooling Conditions
Hao Zhao,Xiuli Hu,Junjia Cui,Zhongwen Xing 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.2
To meet the demands of energy conservation and security improvement, high-strength steel (HSS) is widely used to producesafety-related automotive components. In addition to fully high-strength parts, HSS is also used to manufacture componentswith tailored properties. In this work, a computational model is presented to predict the austenite decomposition into ferrite,pearlite, bainite and martensite during arbitrary cooling paths in HSS. First, a kinetic model for both diffusional and martensitetransformations under isothermal or non-isothermal with constant cooling rate cooling conditions is proposed basedon the well-known Johnson–Mehl–Avrami–Kolmogorov and Kamamoto models. The model is then modified for arbitrarycooling conditions through the introduction of the effects of the cooling rate, and the influence of diffusional transformationson martensite transformation is considered. Next, the detailed kinetics parameters are identified by fitting experimental datafrom BR1500HS steel. The model is further verified by several experiments conducted outside of the fit domain. The resultsobtained by calculation are found to be in good agreement with the corresponding experimental data, including the transformationhistories, volume fraction microconstituents and Vickers hardness. Additionally, the model is also implementedas a subroutine in ABAQUS to simulate a tailored-strength hot stamping process of HSS, and the results are consistent withthe test data. Thus, this computational model can be used as a guideline to design manufacturing processes that achieve thedesired microstructure and material properties.
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