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ISSN : 1225-0562(Print)
ISSN : 2287-7258(Online)
Korean Journal of Materials Research Vol.29 No.12 pp.818-824
DOI : https://doi.org/10.3740/MRSK.2019.29.12.818

The Application of Direct Water Quenching Process in Hot Stamping of Boron Steels

Hyeon Tae Park1,2,Eui Pyo Kwon1†,Ik-Tae Im2
1 Carbon & Light Materials Application R&D Group, Korea Institute of Industrial Technology, Jeonju 54853, Republic of Korea
2 Department of Mechanical Design Engineering, Jeonbuk National University, Republic of Korea
Corresponding author E-Mail : ackep@kitech.re.kr (E. P. Kwon, KITECH)

Abstract

In this study, the direct water quenching technique is applied to validate the applicability of direct water quenching as a cooling method in the hot stamping process of 3.2 mm thick boron steel sheet. Cooling performance of conventional die quenching and direct water quenching is compared. Higher cooling rate is obtained by hot stamping with direct water quenching compared to die quenching. As the flow rate of cooling water increases, the cooling rate increases, and a high cooling rate of 71 oC/s is achieved under flow rate conditions of 0.8 L/min. Through direct water quenching, the cooling time required for sufficient cooling of the sheet is reduced. Full martensitic microstructure is obtained under flow rate condition of 0.8 L/min. Hardness increases with increasing flow rate. From these results, it is verified that the direct water quenching is applicable to the hot stamping of thick boron steel sheet.

보론강 판재 핫스탬핑시 직수분사냉각 공정의 적용성

박현태1,2,권의표1†,임익태2
1 한국생산기술연구원 탄소경량소재응용그룹, 2 전북대학교 기계설계공학과

초록

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