Abstract
The effect of boron addition on strengthening of steel Q690D was studied. The metallographic microstructures of Q690D plate samples after controlled rolling and cooling process and roughing rolling in bench-scale were observed by optical microscope and transmission electron microscope, and the mechanical properties were determined. The results showed that the microstructure of Q690D became finer distinctly with increase in the content of soluble boron in steel. The yield strength and tensile strength also increased with the increase of soluble boron. Most of boron in steel Q690D existed in solid solution state. The main precipitates in Q690D steel were the Ti(C, N) and NbC. The amount of BN was small. Among the strengthening performance of steel Q690D given by boron addition, refinement strengthening gave the greatest contribution on the strengthening effect.
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References
M.E. Bush, P.M. Kelly, Strengthening mechanisms in bainitic steels. Acta Metall. 19, 1363–1371 (1971)
K. Yamamoto, T. Hasegawa, J.I. Takamura, Effect of boron on intra-granular ferrite formation in Ti-oxide bearing steels. ISIJ Int. 36, 80–86 (1996)
A. Brown, J.D. Garnish, R.W.K. Honeycombe, The distribution of boron in pure iron. Met. Sci. 8, 317–324 (1974)
G.F. Melloy, P.R. Summon, P.P. Podgursky, Optimizing the boron effect. Metall. Trans. B 4, 2279–2289 (1973)
T. Hara, H. Asahi, R. Uemori, Role of combined addition of niobium and boron and of molybdenum and boron on hardnenability in low carbon steels. ISIJ Int. 44, 1431–1440 (2004)
D.Q. Bai, S. Yue, T.M. Maccagno, Effect of deformation and cooling rate on the microstructures of low carbon Nb–B steels. ISIJ Int. 38, 371–379 (1998)
E. El-Kashif, K. Asakura, K. Shibata, Effect of cooling rate after recrystallization on p and b segregation along grain boundary in if steels. ISIJ Int. 43, 2007–2014 (2003)
I.B. Timokhina, A.I. Nosenkov, A.O. Humphreys, Effect of alloying elements on the microstructure and texture of warm rolled steels. ISIJ Int. 44, 717–724 (2004)
G. Shigesato, T. Fujishiro, T. Hara, Grain boundary segregation behavior of boron in low-alloy steel. Metall. Trans. A 45A, 1876–1882 (2014)
R.M. Goldhoff, J.W. Spretnak, Distribution of boron in gamma-iron grains. Metall. Trans. A 209, 1278–1283 (1957)
L. Karlsson, H. Norden, H. Odelius, Non-equilibrium grain boundary segregation of boron in austenitic stainless steel-I. Large scale segregation behaviour. Acta Metall. 36, 1–12 (1988)
H. Asahi, Effects of Mo addition and austenitizing temperature on hardenability of low alloy B-added steels. ISIJ Int. 42, 1150–1155 (2002)
Y.S. Shen, S.S. Hansen, Effect of the Ti/N ratio on the hardenability and mechanical properties of a quenched-and-tempered C-Mn-B steel. Metall. Trans. A 28, 2027–2035 (1997)
M. Baarman, Notch toughness in hot-rolled low carbon steel wire rod. Wire Ind. 65, 74–77 (1998)
B. Yalamanchili, J.B. Nelson, P.M. Power, North Star Steel Texas’s experience with boron additions to low-carbon steel. Wire J. Int. 34, 90–94 (2001)
Y. Fujishiro, T. Hashimoto, H. Ohtani, Influence of boron and nitrogen contents on strength and toughness of controlled-rolled and acceleratedly-cooled low carbon steel. Tetsuto Hagane 75, 143–150 (1989)
E. El-Kashif, K. Asakura, T. Koseki, Effects of boron, niobium and titanium on grain growth in ultra high purity 18% Cr ferritic stainless steel. ISIJ Int. 44, 1568–1575 (2004)
Y.C. Liu, F.X. Zhu, Y.M. Li, Effect of TMCP parameters on the microstructure and properties of an Nb-Ti microalloyed steel. ISIJ Int. 45, 851–857 (2005)
Y. Nie, C.J. Shang, X. Song, Properties and homogeneity of 550-Mpa grade TMCP steel for ship hull. Int. J. Miner. Metall. Mater. 17, 179–184 (2010)
C.Y. Huang, J.R. Yang, S.C. Wang, Effects of boron, niobium and titanium on grain growth in ultra high purity 18% Cr ferritic stainless steel. Mater. Trans. JIM 34, 658 (1993)
A.O. Humphreys, D.S. Liu, M.R. Toroghinezhad, Effect of chromium and boron additions on the warm rolling behavior of low carbon steels. ISIJ Int. 42(Suppl), s52–s56 (2002)
Nobuhiro. Tsuji, Yukihiro. Matsubara, Tetsuo. Sakai, Effect of boron addition on the microstructure of hot-deformed Ti-added interstitial free steel. ISIJ Int. 37, 797–806 (1997)
X.M. Wang, X.L. He, Effect of boron addition on structure and properties of low carbon bainitic steels. ISIJ Int. 42, 38–46 (2002)
H. Tamehiro, M. Murata, R. Habu, Effect of combined addition of niobium and boron on thermomechanically processed steel. Tetsu to Hagane 72, 458–465 (1986)
K.Y. Zhu, C. Oberbillig, C. Musik, Effect of B and B + Nb on the bainitic transformation in low carbon steel. Mater. Sci. Eng. A 528, 4222–4231 (2011)
D.T. Llewellyn, Boron in steels. Ironmak. Steelmak. 20, 338–343 (1993)
S.I. Kim, S.H. Choi, Y. Lee, Influence of phosphorous and boron on dynamic recrystallization and microstructures of hot-rolled interstitial free steel. Mater. Sci. Eng. A 406, 125–133 (2005)
S.I. Kim, Y. Lee, Influence of cooling rate and boron content on the microstructure and mechanical properties of hot-rolled high strength interstitial-free steels. Met. Mater. Int. 18, 735–744 (2012)
J. Jonas, I. Weiss, Effect of precipitation on recrystallization in microalloyed steels. Met. Sci. 13, 238–245 (1979)
I. Weiss, J. Jonas, Dynamic precipitation and coarsening of niobium carbonitrides during the hot compression of HSLA steels. Metall. Trans. A 11A, 403–410 (1980)
L. Mavropoulos, J. Jonas, Retardation of austenite recrystallization by the strain induced segregation of boron. Can. Metall. Q. 28, 159–169 (1989)
X.L. He, M. Djahazi, J.J. Jonas, The non-equilibrium segregation of boron during the recrystallization of Nb-treated HSLA steels. Acta Metall. Mater. 39, 2295–2308 (1991)
D. Anjana, K.D. Saikat, B.K. Jha, Strain hardening behavior and cold reducibility of boron-added low-carbon steel. J. Mater. Eng. Perform. 18, 109–115 (2009)
J. Fu, J. Zhu, L. Di, Study on the precipitation behavior of TiN in the microalloyed steel. Acta Metall. Sin. 36, 801–804 (2000)
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Liu, Wj., Li, J., Shi, Cb. et al. Effect of Micro-alloying Element Boron on the Strengthening of High-Strength Steel Q690D. Metallogr. Microstruct. Anal. 4, 102–108 (2015). https://doi.org/10.1007/s13632-015-0191-7
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DOI: https://doi.org/10.1007/s13632-015-0191-7