Abstract
The effect of ultra-fast cooling(UFC) and conventional accelerated cooling(AcC) on the mechanical properties and microstructure of controlled rolled AH32 grade steel plates on industrial scale were compared using tensile test, Charpy impact test, welding thermal simulation, and microscopic analysis. The results show that the properties of the plate produced by UFC are improved considerably comparing to that by AcC. The yield strength is increased with 54 MPa without deterioration in the ductility and the impact energy is improved to more than 260 J at -60 °C with much lower ductile-to-brittle transition temperature(DBTT). The ferrite grain size is refined to ASTM No. 11.5 in the UFC steel with uniform microstructure throughout the thickness direction, while that of the AcC steel is ASTM No. 9.5. The analysis of nucleation kinetics of α-ferrite indicates that the microstructure is refined due to the increased nucleation rate of α-ferrite by much lower γ→α transition temperature through the UFC process. The Hall-Petch effect is quantified for the improvement of the strength and toughness of the UFC steel attributed to the grain refinement.
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References
DeArdo A J. Accelerated cooling: A physical metallurgy perspective[J]. Canadian Metallurgical Quarterly, 1988, 27(2): 141–154.
Ouchi C. Development of Steel Plates by Intensive Use of TMCP and Direct Quenching Processes[J]. ISIJ International, 2001, 41(6): 542–553.
Tomida T, Imai N, Myata K, et al. Grain Refinement of C-Mn Steel to 1 μm by Rapid Cooling and Short Interval Multi-pass Hot Rolling in Stable Austenite Region[J]. ISIJ International, 2008, 48(8): 1142–1147.
Hodgson P, Beladi H, Barnettm R. Grain Refinement in Steels through Thermomechanical Processing[J]. Materials Science Forum, 2005, 500–501: 39–48.
Houyoux C, Herman J C S P. Metallurgical aspects of ultra fast cooling on a hot strip mill[J]. Revue de Metallurgie, 1997, 97: 58–59.
Kagechika H Production and Technology of Iron and Steel in Japan during 2005[J]. ISIJ International, 2006, 46(7): 939–958.
Wang guo-dong. The New generation TMCP with the key technology of ultra-fast cooling[J]. Shanghai Metals, 2008, 30(2): 1–5.
Wang guo-dong. Ultra-fast cooling technology and its industrialization practice[J]. Angang Technology, 2009(6): 1–5.
Tamura I. Some Fundamental Steps in Thermomechanical Processing of Steels[J]. Transactions ISIJ, 1987 (27): 763–779.
Gladman T. The Physical Metallurgy of Mcroalloyed Steels[M]. London: The Institute of Materials, 1997: 359.
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Zhou, C., Ye, Q., Yan, L. (2016). Effect of Ultra-Fast Cooling on Microstructure and Properties of High Strength Steel for Shipbuilding. In: HSLA Steels 2015, Microalloying 2015 & Offshore Engineering Steels 2015. Springer, Cham. https://doi.org/10.1007/978-3-319-48767-0_147
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DOI: https://doi.org/10.1007/978-3-319-48767-0_147
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-48614-7
Online ISBN: 978-3-319-48767-0
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