Liquid nitrogen jet impingement cooling of ultra-high strength steel in hot stamping process

Liquid nitrogen jet impingement cooling of ultra-high strength steel in hot stamping process

CAO Dongsheng, LI Lei, HUANG Haihong

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Abstract. In the hot stamping process, elevated sheet temperatures and uneven die cooling contribute to insufficient thickness uniformity in the formed parts, leading to reduced forming efficiency and inducing severe thermo-mechanical fatigue in the die. To address these issues, a novel in-die liquid nitrogen (LN2) jet impingement cooling method is introduced to achieve a low and uniform initial holding temperature. The high-temperature steel sheet is initially cooled to slightly above the martensitic transition temperature through the application of an LN2 jet during the forming stage, followed by pressure-holding quenching. This method demonstrates remarkable outcomes, including a notable 74.19% reduction in holding time and a substantial 24.72% decrease in the maximum thinning rate. Furthermore, the maximum temperature difference between the upper and lower dies sees significant reductions of 34.57% and 25.84%, respectively.

Hot Stamping Dies, Direct Cooling, Jet Impingement

Published online 4/24/2024, 9 pages
Copyright © 2024 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA

Citation: CAO Dongsheng, LI Lei, HUANG Haihong, Liquid nitrogen jet impingement cooling of ultra-high strength steel in hot stamping process, Materials Research Proceedings, Vol. 41, pp 2901-2909, 2024


The article was published as article 317 of the book Material Forming

Content from this work may be used under the terms of the Creative Commons Attribution 3.0 license. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.

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