Abstract
The effects of nitrogen content and hot forming temperature on prior austenite grain size for normalizing cryogenic pressure-vessel steels were described. The evolution of V(C,N) precipitates during thermal cycle of hot forming was analyzed. The optical microscopy displays that as increasing N content from 0.0094 to 0.0198 wt.% the refinement of prior austenite grain was seen at each hot forming temperature of 870, 910 and 950 °C. The transmission electron microscopy presents that much finer V(C,N) precipitates were found in sample with 0.0198 wt.% N content than in sample with 0.0094 wt.% N content. Thermo-Calc calculation reveals the precipitation temperature of V(C,N) was increased by increasing N content. While the Ostwald ripening rate of V(C,N) was decreased by increasing N content. TEM result and Thermo-Calc calculation indicate that increasing N content enhanced the thermal stability of V(C,N) precipitates. The stable finer V(C,N) precipitates contribute to the finer prior austenite grain and good mechanical properties for sample with 0.0198 wt.% N content even at higher temperature of 950 °C during hot forming process.
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References
X.J. Wang, S.R. Li, W.B. Liu, G.F. Zhan, and X.L. Yang, Effect of Normalizing Temperature on Microstructure and Mechanical Properties of V-N Micro-Alloyed WH630E Steel Plate, Heat Treat Met., 2017, 42(5), p 98–103 (Chinese)
T. Siwecki, S. Zajac, Recrystallization Controlled Rolling and Accelerated Cooling of Ti-V-(Nb)-N Microalloyed Steels, Proc. 32nd Mechanical Working and Steel Processing Conference, ISS-AIME, Warrendale, USA, 1991, p 441–451.
T. Gladman, The Physical Metallurgy of Microalloyed Steels, The Institute of Materials, London, 1997
K.A. Taylor, Microstructure and Properties of Vanadium Microalloyed Steels, Scr. Metall. Mater., 1995, 32(1), p 0–12
T.N. Baker, Process, Microstructure and Properties of Vanadium Microalloyed Steels, Mater. Sci. Technol., 2009, 25(9), p 1083–1107
R. Lagneborg, T. Siwecki, S. Zajac, and B. Hutchinson, The Role of Vanadium in Microalloyed Steels, Scand. J. Metall., 1999, 28(5), p 186–241
P.D. Odesskii, L.A. Smirnov, V.A. Parshin, and A.A. Kirichkov, Nitrogen as a Microalloying Element in Steel for Metallic Structures, Steel Transl., 2015, 45(5), p 378–389
C. Durduc-Roibu and E. Drugescu, Optimization of Chemical Composition for Pressure Vessel Steel Grade P460NL2-industrial trial Research, Adv. Mater. Res., 2017, 1143, p 45–51
M.W. Tong, Z.X. Yuan, and K.G. Zhang, Influence of Vanadium on Microstructures and Mechanical Properties of High Strength Normalized Steel, Adv. Mater. Res., 2012, 535, p 628–632
F. Ishikawa, T. Takahashi, and T. Ochi, Intragranular Ferrite Nucleation in Medium-Carbon Vanadium Steels, Metall Mater Trans A., 1994, 25(5), p 929–936
S.W. Thompson and G. Krauss, Precipitation and Fine Structure in Medium-carbon Vanadium and Vanadium/Niobium, Metall. Trans. A, 1989, 20(11), p 2279–2288
S.F. Medina, M. Gómez, and L. Rancel, Grain Refinement by Intragranular Nucleation of Ferrite in a High Nitrogen Content Vanadium Microalloyed Steel, Scr. Mater., 2008, 58(12), p 1110–1113
Q.L. Yong, Second Phases in Structural Steels, Metallurgical Industry Press, Beijing, 2006 (in Chinese)
T. Pan, X.Y. Chai, J.G. Wang, S. Hang, and C.F. Yang, Precipitation Behavior of V-N Microalloyed Steels During Normalizing, J. Iron Steel Res. Int., 2015, 22(11), p 1037–1042
H.H. Wang, Z.P. Qin, R. Wei, X.L. Wan, K.M. Wu, and R.D.K. Misra, Precipitation of Carbonitrides and High Temperature Strength in Heat-Affected Zone of High-Nb Containing Fire-Resistant Steel, Sci. Technol. Weld Join., 2017, 22(2), p 157–165
S.G. Hong, H.J. Jun, K.B. Kang, and C.G. Park, Evolution of Precipitates in the Nb-Ti-V Microalloyed HSLA Steels During Reheating, Scr. Mater., 2003, 48(8), p 1201–1206
F.Z. Bu, X.M. Wang, L. Chen, S.W. Yang, C.J. Shang, and R.D.K. Misra, Influence of Cooling Rate on the Precipitation Behavior in Ti-Nb-Mo Microalloyed Steels During Continuous Cooling and Relationship to Strength, Mater. Charact., 2015, 102, p 146–155
Q.L. Yong, A.M. Bai, and Y. Gan, Ostwald Ripening of the Second Phase Particle in Dilute Solution—II. Analytical Solution (in Chinese), J. Iron Steel Res., 1992, 01, p 59–66
H. Azizi-Alizamini, M. Militzer, and W.J. Poole, Formation of Ultrafine Grained Dual Phase Steels Through Rapid Heating, ISIJ Int., 2011, 51(6), p 958–964
C.F. Yang, Recent Development of Vanadium Microalloying Technology, Iron Steel, 2013, 48(4), p 1–12
T. Hanamura, F. Yin, and K. Nagai, Ductile-Brittle Transition Temperature of Ultrafine Ferrite/Cementite Microstructure in a Low Carbon Steel Controlled by Effective Frain Size, ISIJ Int., 2004, 44(3), p 610–617
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The authors gratefully acknowledge the financial support received from National Natural Science Foundation of China (No. 51971165) and Baoshan Steel & Iron Co. Ltd. under Grant (No. 19R064ECQ0).
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Hou, H., Wang, H. & Cai, H. Effects of Nitrogen Content and Hot Forming Temperature on Prior Austenite Grain Size and Mechanical Properties for Normalizing Cryogenic Pressure-Vessel Steels. J. of Materi Eng and Perform 29, 3670–3677 (2020). https://doi.org/10.1007/s11665-020-04924-5
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DOI: https://doi.org/10.1007/s11665-020-04924-5