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Open AccessArticle

Minimisation of Heating Time for Full Hardening in Hot Stamping Using Direct Resistance Heating

1
Division of Systems Research, Faculty of Engineering, Yokohama National University, Yokohama, Kanagawa 240-8501, Japan
2
Department of Mechanical Engineering, Toyohashi University of Technology, Toyohashi, Aichi 441-8580, Japan
3
Department of Mechanical Engineering, Materials Science, and Ocean Engineering, Graduate School of Engineering Science, Yokohama National University, Yokohama, Kanagawa 240-8501, Japan
*
Author to whom correspondence should be addressed.
J. Manuf. Mater. Process. 2020, 4(3), 80; https://doi.org/10.3390/jmmp4030080
Received: 20 July 2020 / Revised: 4 August 2020 / Accepted: 6 August 2020 / Published: 7 August 2020
To obtain enough hardness of the die-quenched products after hot stamping using direct resistance heating, the effects of the electrifying condition and initial microstructure of the quenchable steel sheet on hardness were examined in a hot bending experiment. The steel sheet was heated up to 900 °C in 3 to 10 s. The required heating time was shortened by normalising heat treatment due to the fine grain size of the sheet. The standard deviation of the hardness of the sheet heated to 900 °C in 3.2 s without temperature holding at the austenitising temperature was 12 HV, whereas the deviation reduced to 5 HV for temperature holding at the austenitising temperature of 3 s. View Full-Text
Keywords: hot stamping; die quenching; quenchability; heating time; direct resistance heating hot stamping; die quenching; quenchability; heating time; direct resistance heating
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MDPI and ACS Style

Maeno, T.; Mori, K.-I.; Sakagami, M.; Nakao, Y.; Talebi-Anaraki, A. Minimisation of Heating Time for Full Hardening in Hot Stamping Using Direct Resistance Heating. J. Manuf. Mater. Process. 2020, 4, 80.

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