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2018 Vol.28, Issue 8 Preview Page
Effect of Rolling Conditions on Microstructure and Mechanical Properties of Thick Steel Plates for Offshore Platforms

해양플랜트용 후판강의 미세조직과 기계적 특성에 미치는 압연 조건의 영향

Jongchul Kim1
,
Yonhchan Suh1
,
Sungdoo Hwang1
,
Sang Yong Shin2†
김 종철1
,
서 용찬1
,
황 성두1
,
신 상용2†
1Technical Research Center, Hyundai Steel Company, Dangjin 31719, Republic of Korea
2School of Materials Science and Engineering, University of Ulsan, Ulsan 44610, Republic of Korea
1현대제철 기술연구소
2울산대학교 첨단소재공학부
†Corresponding author E-Mail : sshin@ulsan.ac.kr (S. Y. Shin, University of Ulsan)
August 2018. pp. 478-488
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Abstract

In this study, three kinds of steels are manufactured by varying the rolling conditions, and their microstructures are analyzed. Tensile and Charpy impact tests are performed at room temperature to investigate the correlation between microstructure and mechanical properties. In addition, heat affected zone(HAZ) specimens are fabricated through the simulation of the welding process, and the HAZ microstructure is analyzed. The Charpy impact test of the HAZ specimens is performed at -40 °C to investigate the low temperature HAZ toughness. The main microstructures of steels are quasi-polygonal ferrite and pearlite with fine grains. Because coarse granular bainite forms with an increasing finish rolling temperature, the strength decreases and elongation increases. In the steel with the lowest reduction ratio, coarse granular bainite forms. In the HAZ specimens, fine acicular ferrites are the main features of the microstructure. The volume fraction of coarse bainitic ferrite and granular bainite increases with an increasing finish rolling temperature. The Charpy impact energy at -40 °C decreases with an increasing volume fraction of bainitic ferrite and granular bainite. In the HAZ specimen with the lowest reduction ratio, coarse bainitic ferrite and granular bainite forms and the Charpy impact energy at -40 °C is the lowest.

Keywords
thick steel plates
rolling conditions
tensile properties
charpy impact properties
heat affected zone
References
1.
T. C. Cheng , C. Yu, T. C. Yang, C. Y. Huang, H. C. Lin and R.-K. Shiue, Arch. Metall. Mater., 63, 167 (2018).
2.
D. S. Liu , Q. L. Li and T. Emi, Metall. Mater. Trans. A, 42, 1349 (2011). 10.1007/s11661-010-0458-1
3.
Y. L. Zhou , T. Jia, X. J. Zhang, Z. Y. Liu and R. D. K. Misra, Mater. Sci. Eng., A, 626, 352 (2015). 10.1016/j.msea.2014.12.074
4.
B. L. Bramfitt and J. G. Speer, Metall. Trans. A, 21, 817 (1990). 10.1007/BF02656565
5.
J. H. Chen , Y. Kikut, T. Araki, M. Yoned and Y. Matsuda, Acta Metall. 32, 1779 (1984). 10.1016/0001-6160(84)90234-7
6.
C. M. Kim , J. B. Lee and W. Y. Choo, Proc. 13th Int. Conf. Offshore and Polar Eng., Honolulu, Hawaii, 90 (2003).
7.
B. C. Kim , S. Lee, N. J. Kim and D. Y. Lee, Metall. Mater. Trans. A, 22A, 139 (1991). 10.1007/BF03350956
8.
N. Yurioka , Weld. World, 35, 375 (1995).
9.
R. E. Dolby , Weld. Res. Int., 7, 298 (1977).
10.
Y. U. Zhang , X. Li and H. Ma, Metall. Mater. Trans. B, 47, 2148 (2016). 10.1007/s11663-015-0534-4
11.
X. L. Wang , Y. T. Tsai, J. R. Yang, Z. Q. Wang, X. C. Li, C. J. Shang and R. D. K. Misra, Weld, World, 61, 1155 (2017). 10.1007/s40194-017-0498-x
12.
A. D. Schino and P. E. D. Nunzio, Mater. Lett., 186, 86 (2017). 10.1016/j.matlet.2016.09.092
13.
M. Hamada , Y. Fukada and Y. Komiz, ISIJ Int., 35, 1196 (1995). 10.2355/isijinternational.35.1196
14.
S. F. Medina , ISIJ Int., 39, 930 (1999). 10.2355/isijinternational.39.930
15.
M. Chapa , ISIJ Int., 42, 1288 (2002). 10.2355/isijinternational.42.1288
16.
A. D. Schino and C. Guarnaschelli, Mater. Lett., 63, 1968 (2009). 10.1016/j.matlet.2009.06.032
17.
A. D. Schino , L. Alleva and M. Guagnelli, Mater. Sci. Forum, 860, 715 (2012).
18.
C. Yu , T. C. Yang, C. Y. Huang and R. K. Shiue, Metall. Mater. Trans. A, 47A, 4777 (2016). 10.1007/s11661-016-3654-9
19.
S. K. Dhua , D. Mukerjee and D. S. Sarma, Metall. Mater. Trans. A, 32A, 2259 (2001). 10.1007/s11661-001-0201-z
20.
B. Hwang , C. G. Lee and S. J. Kim, Metall. Mater. Trans. A, 42A, 717 (2011). 10.1007/s11661-010-0448-3
21.
T. C. Yang , C. Y. Huang, T. C. Cheng, C. Yu and R. K. Shiue, Adv. Mater. Res., 936, 1312 (2014).
22.
G. Heigl , H. Lengauer and P. Hodnik, Steel Res. Intl., 79, 931 (2008). 10.1002/srin.200806223
23.
T. Araki , Atlas for Bainitic Microstructures, ISIJ, Tokyo, Japan, 1 (1992).
24.
G. Krauss and S.W. Thompson, ISIJ Int., 35, 937 (1995). 10.2355/isijinternational.35.937
25.
H. K. D. H. Bhadeshia , Mater. Sci. Eng., A, A378, 34 (2004). 10.1016/j.msea.2003.10.328
26.
D. Deng and S.Kiyoshima, Comp.Mater.Sci., 62, 23 (2012). 10.1016/j.commatsci.2012.04.037
27.
H. Qiu , M.Enoki, Y.Kawaguchi and T.Kishi, ISIJ Int., 40, 34 (2000). 10.2355/isijinternational.40.Suppl_S34
28.
N. J. Kim , A. J. Yang and G. Thomas, Metall. Trans. A, 16A, 471 (1985). 10.1007/BF02814349
29.
G. E. Dieter , Mechanical Metallurgy, McGraw-Hill Book Co., New York (1988).
30.
G. Krauss , Steels Processing, Structure, and Performance, Asm Intl. (2005).
Information
  • Publisher :Materials Research Society of Korea
  • Publisher(Ko) :한국재료학회
  • Journal Title :Korean Journal of Materials Research
  • Journal Title(Ko) :한국재료학회지
  • Volume : 28
  • No :8
  • Pages :478-488
  • Received Date : 2018-07-23
  • Revised Date : 2018-07-23
  • Accepted Date : 2018-08-09
  • DOI :https://doi.org/10.3740/MRSK.2018.28.8.478
Journal Informaiton Korean Journal of Materials Research Korean Journal of Materials Research
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