보론강 판재 핫스탬핑시 직수분사냉각 공정의 적용성

박현태; 권의표; 임익태; Hyeon Tae Park; Eui Pyo Kwon; Ik-Tae Im

Korean Journal of Materials Research, Vol.29, No.12, 818-824, December, 2019

DOI10.3740/MRSK.2019.29.12.818 Export Citation

보론강 판재 핫스탬핑시 직수분사냉각 공정의 적용성

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

박현태^{1, 2}, 권의표^{2, †}, 임익태²

¹한국생산기술연구원 탄소경량소재응용그룹
²전북대학교 기계설계공학과

Hyeon Tae Park^{1, 2}, Eui Pyo Kwon^{1, †}, and Ik-Tae Im²

¹Carbon & Light Materials Application R&D Group, Korea Institute of Industrial Technology, Jeonju 54853, Republic of Korea
²Department of Mechanical Design Engineering, Jeonbuk National University, Republic of Korea

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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 °C/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.

Keywords:hot stamping;direct water quenching;boron steel;cooling rate;microstructure

[References]

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Gonzalez BFB, Artola G, de Lacalle NL, Angulo C, Metals, 9, 235 (2019)

[Referenced By]

[1] Karbasian H, Tekkaya AE, J. Mater. Process. Technol., 210, 2103 (2010)

[2] Naderi M, Ketabchi M, abbasi M, bleck W, J. Mater. Sci. Technol., 27, 369 (2011)

[3] Merklein M, Lechler J, J. Mater. Process. Technol., 177, 452 (2006)

[4] Zhou J, Wang B, Huang M, Cui D, J. Mater. Int., 21, 544 (2014)

[5] Muro M, Artola G, Gorrino A, Angulo C, Metals, 8, 385 (2018)

[6] Fuckuchi H, Nomura N, Nippon Steel & Sumitomo Metal Technical Report, 112, (2016).

[7] Kim S, Kong H, J. Welding and Joining, 33, 36 (2015).

[8] Maeno T, Mori KI, Fujimoto M, CIRP Annals Manuf. Technol., 64, 281 (2015).

[9] Mori K, Bariani PF, Behrens BA, Brosius A, Bruschi S, Maeno T, Merklein M, Yanagimoto J, CIRP Annals Manuf. Technol., 66, 755 (2017)

[10] Namklang P, Uthaisangsuk V, J. Manuf. Processes, 21, 87 (2016)

[11] Hwang BC, Korean J. Mater., 25, 497 (2015)

[12] Lee SI, Cho Y, Hwang BC, Korean J. Mater., 26, 325 (2016)

[13] Neugebauer R, Altan T, Geiger M, Kleiner M, Sterzing A, CIRP. Annals., 55, 793 (2006)

[14] Gonzalez BFB, Artola G, de Lacalle NL, Angulo C, Metals, 9, 235 (2019)