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Novel Method for Predicting Hardness Distribution of Hot-Stamped Part Using FE-Simulation Coupled with Quench Factor Analysis

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Abstract

In the hot stamping of boron-alloyed steel, the mechanical properties of hot-stamped parts have been predicted by many empirical models based on Kirkaldy’s equation. Although these models are skillfully developed, there is still a need to precisely and easily predict the mechanical properties in the hot stamping process. Therefore, this study aims to suggest a novel method for the accurate prediction of the hardness distribution of hot-stamped parts by the use of finite element (FE)-simulations coupled with quench factor analysis (QFA). First, dilatometry of boron steel was performed at various cooling rates from 0.5 to 70 K/s using a dilatometer with a forced-air cooling system. The dilatometry test provided hardness data according to the cooling rates, which were used to determine the material constants (K 1 to K 5) of the QFA and the time–temperature–property diagram of boron steel. Then, FE-simulation of hot stamping was conducted to obtain the cooling curves for blanks with thicknesses of 1.2 and 1.6 mm. The extracted results from the FE-simulation were used to predict the hardness distribution of the hot-stamped parts using QFA. Finally, a hot stamping experiment was performed to verify the predicted results and to examine the effect of the blank thickness on the cooling rates of a hot-stamped part. The predicted hardnesses for the parts were in good agreement with the measured values, within a maximum error of 4.96 pct.

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Acknowledgment

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP) (No. 2012R1A5A1048294).

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Author notes

  1. Dae-Hoon Ko (Researcher)

    Present address: Department of Special Steel Technology Development, Hyundai-Steel Corporation, Dangjin, Chungnam, 343-711, South Korea

Authors and Affiliations

  1. Department of Special Steel Technology Development, Hyundai-Steel Corporation, Dangjin, Chungnam, 343-711, South Korea

    Dae-Cheol Ko (Associate Professor) & Byung-Min Kim (Professor)

  2. Industrial Liaison Innovation Center, Pusan National University, Pusan, 609-735, South Korea

    Dae-Hoon Ko (Researcher) & Dae-Cheol Ko (Associate Professor)

  3. Department of Mechanical Engineering, Pusan National University, Pusan, 609-735, South Korea

    Byung-Min Kim (Professor)

Authors
  1. Dae-Hoon Ko
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  2. Dae-Cheol Ko
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  3. Byung-Min Kim
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Correspondence to Byung-Min Kim.

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Manuscript submitted July 21, 2014.

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Ko, DH., Ko, DC. & Kim, BM. Novel Method for Predicting Hardness Distribution of Hot-Stamped Part Using FE-Simulation Coupled with Quench Factor Analysis. Metall Mater Trans B 46, 2072–2083 (2015). https://doi.org/10.1007/s11663-015-0390-2

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