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Modeling of Microstructure Evolution in 22MnB5 Steel during Hot Stamping

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Abstract

Automoble manufacturers have been increasingly adopting hot-stamped parts for use in newly designed vehicles to improve crash worthiness and fuel efficiency. However, the simulation of hot stamping is rather complex and challenging, and further research still needs to be done on hot stamping hardening mechanism. The microstructure evolution and hardening mechanisms during hot stamping of 22MnB5 steel were thoroughly investigated, using information provided in the literatures as well as experimental results. New models were developed to predict the grain growth during heating and the flow stress of a manganese boron steel (22MnB5) with high hardenability by the Gleeble simulation experimental results. The deformed austenite decompostion during stamping and quenching was emphatically quantified based on the transformation thermodynamic and kinetic theories, and the relationship of microstructure to properties was analyzed. The results showed that the optimal process to obtain homogeneous and small lath martensite is heating at 900–950 °C for 5 min and then quenching at 50 °C/s with a pressing time about 8 s.

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Authors and Affiliations

  1. College of Materials Science and Engineering, Jilin University, Changchun, Jilin, 130025, China

    Li-juan Zhu (Doctor, Associate Professor), Zheng-wei Gu & Hong Xu

  2. Technology Center, Changchun Railway Vehicles Co., Ltd., Changchun, Jilin, 130062, China

    Li-juan Zhu (Doctor, Associate Professor) & Yi Lü

  3. Advanced Manufacture Technology Center, Academy of Machinery Science and Technology, Bijing, 100083, China

    Jiang Chao

Authors
  1. Li-juan Zhu
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  2. Zheng-wei Gu
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  3. Hong Xu
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  4. Yi Lü
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  5. Jiang Chao
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Correspondence to Li-juan Zhu.

Additional information

Foundaton Item: Item Sponsored by Major Project of Ministry of Industry and Information Technology of China (2009ZX04014-072); Basic Research Proect of Jilin University of China (200903019)

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Zhu, Lj., Gu, Zw., Xu, H. et al. Modeling of Microstructure Evolution in 22MnB5 Steel during Hot Stamping. J. Iron Steel Res. Int. 21, 197–201 (2014). https://doi.org/10.1016/S1006-706X(14)60030-3

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  • DOI: https://doi.org/10.1016/S1006-706X(14)60030-3

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