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Study on selective cooling of ultra high strength steel car body in hot forming

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Abstract

Although traditional hot forming parts are designed to have high strength to satisfy the requirement of lightweight and crash safety, its plasticity is too low to meet the need of part regional property. To overcome this shortcoming, the selective cooling process is a solution for properties regional distribution of part design. In this paper, the simulation is used to analyze the non-uniform temperature field and hot forming process. The results predict the microstructure of the slow cooling zone can obtain ferrite and pearlite that of the rapid cooling zone can get martensite. Experiments verified simulations by metallographic, tensile strength tests, and elongation measurement. The analysis of the metallography draws the same conclusion as the simulation. The tensile strength of the rapid cooling part can reach 1500MPa while that of the other is just 680MPa. The elongation of the slow cooling part can reach 11.2%, which of the rapid one is about 7.0%. The method of selective cooling could realize regional distribution of properties and different microstructure of materials. It provides a new direction for further research on distribution of properties and hot forming technology.

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Funding

This work was financially supported by National Natural Science Foundation of PR China (Grant No.51275216, 51775249)

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  1. School of Materials Science and Technology, Jiangsu University, Zhenjiang, 212013, China

    SongNan Yang & LeiGang Wang

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  1. SongNan Yang
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  2. LeiGang Wang
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Correspondence to LeiGang Wang.

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Yang, S., Wang, L. Study on selective cooling of ultra high strength steel car body in hot forming. Int J Adv Manuf Technol 97, 1583–1590 (2018). https://doi.org/10.1007/s00170-018-1864-6

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  • DOI: https://doi.org/10.1007/s00170-018-1864-6

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