압력용기용 A516 강의 미세조직에 미치는 탄소 당량과 냉각 속도의 영향

이현욱; 강의구; 김민수; 신상용; Hyun Wook Lee; Ui Gu Kang; Min Soo Kim; Sang Yong Shin

Korean Journal of Materials Research, Vol.29, No.8, 511-518, August, 2019

DOI10.3740/MRSK.2019.29.8.511 Export Citation

압력용기용 A516 강의 미세조직에 미치는 탄소 당량과 냉각 속도의 영향

Effect of Carbon Equivalent and Cooling Rate on Microstructure in A516 Steels for Pressure Vessel

이현욱, 강의구¹, 김민수¹, 신상용^†

울산대학교 첨단소재공학과
¹현대제철 R&D Center

Hyun Wook Lee, Ui Gu Kang¹, Min Soo Kim¹, and Sang Yong Shin^†

1School of Materials Science and Engineering, University of Ulsan, Ulsan 44610, Republic of Korea
¹Technical Research Center, Hyundai Steel Company, Dangjin 31719, Republic of Korea

E-mail:

In this study, the effect of carbon equivalent and cooling rate on microstructure and hardness of A516 steels for pressure vessel is investigated. Six kinds of specimens are fabricated by varying carbon equivalent and cooling rate, and their microstructures and hardness levels are analyzed. Specimens with low carbon equivalent consist of ferrite and pearlite. As the cooling rate increases, the size of pearlite decreases slightly. The specimens with high carbon equivalent and rapid cooling rates of 10 and 20 °C/s consist of not only ferrite and pearlite but also bainite structure, such as granular bainite, acicular ferrite, and bainite ferrite. As the cooling rate increases, the volume fractions of bainite structure increase and the effective grain size decreases. The effective grain sizes of granular bainite, acicular ferrite, and bainitic ferrite are ~20, ~5, and ~10 μm, respectively. In the specimens with bainite structure, the volume fractions of acicular ferrite and bainitic ferrite, with small effective grains, increase as cooling rate increases, and so the hardness increases significantly.

Keywords:A516 steel;carbon equivalent;cooling rate;microstructure;bainite

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[1] Han IW, Hong ST, J. Welding and Joining, 28, 125 (2010).

[2] Bhadeshia HKDH, Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process., 378A, 34 (2004)

[3] Garcia-Mateo C, Peet M, Caballero FG, Bhadeshia HKDH, Mater. Sci. Technol., 20, 814 (2004)

[4] Lee CH, Bhadeshia HKDH, Lee HC, Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process., 360A, 249 (2003)

[5] Araki T, ISIJ, Tokyo, Japan, 1-100 (1992).

[6] Kim KH, Moon IJ, Kim KW, Kang KB, Park BG, Mater. Sci. Technol., 33, 321 (2017)

[7] Zajac S, Siwecki T, Hutchinson B, Attlegard M, Metall. Trans., 22A, 2681 (1991)

[8] Lee SH, Kwon DI, Lee YK, Kwon OJ, Metall. Trans., 26A, 1093 (1995)

[9] Gang UG, Lee JC, Nam WJ, Met. Mater. Int., 15, 719 (2009)

[10] Pavlina EJ, Van Tyne CJ, J. Mater. Eng. Performance, 17, 888 (2008)

[11] Zhang P, Li SX, Zhang ZF, Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process., 529A, 62 (2011)

[12] Andrews KW, J. Iron and Steel Inst., 203, 721 (1965).

[13] Kung CY, Raymond JJ, Metall. Trans., 13A, 328 (1982)

[14] Krauss G, Thompson SW, ISIJ Int., 35, 937 (1995)

[15] Hillert M, Hoglund L, Agren J, Metall. Trans., 35A, 3693 (2004)

[16] Ohtsuka H, Kajiwara S, Metall. Trans., 25A, 63 (1994)

[17] Chen JH, Hu SH, Wang GZ, Metall. Trans., 32A, 1081 (2001)

[18] Devine TM, Metall. Trans., 11A, 791 (1980)

[19] Jeong WC, Metall. Trans., 45A, 5286 (2014)

[20] Suikkanen P, Karjalainen P, Deardo AJ, the 3rd International Conference Thermomechanical Processing of Steels, Padova, Italy (2008).

[21] Suikkanen PP, Ristola AJ, Hirvi AM, Sahu P, Somani MC, Porter DA, Karjalainen LP, ISIJ Inter., 53, 337 (2013)

[22] Dhua SK, Mukerjee D, Sarma DS, Metall. Trans., 34A, 2493 (2003)

[23] Huang G, Wu KM, Metall. Mater. Int., 17, 847 (2011)

[24] Park SG, Kim MC, Lee BS, Wee DM, Korean J. Met. Mater., 46, 771 (2008)