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Experimental and Simulation Study for Heat Transfer Coefficient in Hot Stamping of High-Strength Boron Steel

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Abstract

An optimization-based numerical procedure was developed to determine the pressure-dependent heat transfer coefficient (HTC) between the blank and tools during the hot stamping of boron steel. During the quenching period, HTC increased with the contact pressure between blank and lower tool. There is no obvious linear relationship between them. The maximum value of 1500 W/m2 K was achieved at contact pressure 18 MPa.

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Abbreviations

C p :

Specific heat (J/kg K)

M s :

Martensite start temperature (K)

T :

Temperature (K)

\( {T_{{i,{\text{B}}}}^{\text{Exp}} } \) :

Blank experimental temperatures

\( {T_{{i,{\text{B}}}}^{\text{Sim}} } \) :

Blank calculating temperatures

\( T_{{j,{\text{L}}}}^{\text{Exp}} \) :

Lower tool experimental temperatures

\( {T_{{i,{\text{L}}}}^{\text{Sim}} } \) :

Lower tool calculating temperatures

f M :

Martensite fraction (–)

k :

Thermal conductivity (W/m K)

t :

Time (s)

δ B :

Error function of blank temperature

δ L :

Error function of lower tool temperature

B:

Blank

L:

Lower tool

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This work was supported by the National Natural Science Foundation of China (51205162) and National Natural Science Foundation of China (51275203).

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Authors and Affiliations

  1. School of Material Science and Engineering, Jilin University, Changchun, China

    Zhiqiang Zhang (Postgraduate), Peng Gao (Postgraduate) & Chaoyang Liu (Postgraduate)

  2. Roll Forging Research Institute, Jilin University, Changchun, China

    Xiangji Li (Associate Professor)

Authors
  1. Zhiqiang Zhang
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  2. Peng Gao
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  3. Chaoyang Liu
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  4. Xiangji Li
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Correspondence to Zhiqiang Zhang.

Additional information

Manuscript submitted April 6, 2015.

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Zhang, Z., Gao, P., Liu, C. et al. Experimental and Simulation Study for Heat Transfer Coefficient in Hot Stamping of High-Strength Boron Steel. Metall Mater Trans B 46, 2419–2422 (2015). https://doi.org/10.1007/s11663-015-0452-5

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