Spray cooling of early extracted hot stamped parts

authored by: Florian Nürnberger, Max Diekamp, Jörn Moritz, Lars Wolf, Sven Hübner, Bernd Arno Behrens
Abstract: Hot stamping of automotive parts becomes increasingly important since the hot forming allows manufacturing of parts such as A-pillars with a high specific strength and stiffness. For processing, sheets of suited steels such as the heat treatable steel 22MnB5 are usually firstly austenized, transferred to the forming press, hot stamped and then quenched in the closed die. Cooling rates of at least about 27 K/s are necessary to form the desired martensitic microstructure during quenching. Due to the limited heat transfer to the forming die the cooling below the martensite finish temperature is slow and the process productivity is comparatively low. Regarding the demand for an increased productivity, hot stamped parts were early removed from the die and transferred to an external cooling device where the parts were quenched below the martensite finish temperature by means of a water-air-spray. Various removal temperatures were investigated, process conditions resulting in low distortions identified and mechanical properties characterized.
Organisation(s): Institute of Materials Science
Institute of Metal Forming and Metal Forming Machines
Type: Conference contribution
Pages: 983-990
No. of pages: 8
Publication date: 01.01.2014
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: Condensed Matter Physics, Mechanics of Materials, Metals and Alloys
Electronic version(s): https://doi.org/10.1007/978-3-319-48237-8_116 (Access: Closed)
: Details in the research portal "Research@Leibniz University"

BibTeX

@inproceedings{d525296f8a7f43db98c71e1edc9b4f48,
title = "Spray cooling of early extracted hot stamped parts",
abstract = "Hot stamping of automotive parts becomes increasingly important since the hot forming allows manufacturing of parts such as A-pillars with a high specific strength and stiffness. For processing, sheets of suited steels such as the heat treatable steel 22MnB5 are usually firstly austenized, transferred to the forming press, hot stamped and then quenched in the closed die. Cooling rates of at least about 27 K/s are necessary to form the desired martensitic microstructure during quenching. Due to the limited heat transfer to the forming die the cooling below the martensite finish temperature is slow and the process productivity is comparatively low. Regarding the demand for an increased productivity, hot stamped parts were early removed from the die and transferred to an external cooling device where the parts were quenched below the martensite finish temperature by means of a water-air-spray. Various removal temperatures were investigated, process conditions resulting in low distortions identified and mechanical properties characterized.",
keywords = "22MnB5, Hot stamping, Process optimization, Spray cooling",
author = "Florian N{\"u}rnberger and Max Diekamp and J{\"o}rn Moritz and Lars Wolf and Sven H{\"u}bner and Behrens, {Bernd Arno}",
note = "Copyright: Copyright 2020 Elsevier B.V., All rights reserved.; 143rd Annual Meeting and Exhibition, TMS 2014 ; Conference date: 16-02-2014 Through 20-02-2014",
year = "2014",
month = jan,
day = "1",
doi = "10.1007/978-3-319-48237-8_116",
language = "English",
isbn = "9781118889725",
series = "TMS Annual Meeting",
publisher = "Minerals, Metals and Materials Society",
pages = "983--990",
booktitle = "TMS 2014 - 143rd Annual Meeting and Exhibition, Supplemental Proceedings",
address = "United States",
}