Abstract
This paper studies the composition, quantity and particle size distribution of nano-scaled precipitates with size less than 20 nm in high strength low carbon (HSLC) steel and their effects on mechanical properties of HSLC steel by means of mass balance calculation of nano-scaled precipitates measured by chemical phase analysis plus SAXS method, high-resolution TEM analysis and thermodynamics calculation, as well as temper rapid cooling treatment of ZJ330. It is found that there existed a large quantity of nano-scaled iron-carbon precipitates with size less than 18 nm in low carbon steel produced by CSP and they are mainly Fe-O-C and Fe-Ti-O-C precipitates formed below temperature A 1. These precipitates have obvious precipitation strengthening effect on HSLC steel and this may be regarded as one of the main reasons why HSLC steel has higher strength. There also existed a lot of iron-carbon precipitates with size less than 36 nm in HSLA steels.
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Li Y, Wilson J A, Crowther D N, et al. The effects of vanadium (Nb, Ti) on the microstructure and mechanical properties of thin slab cast steels. In: The Chinese Society for Metals, eds. TSCR’2002, Guangzhou, China, 2002, 218–234
Garcia C I, Tokarz C, Graham C, et al. Niobium HSLA steels producing the thin slab casting process: Hot strip mill products, properties and applications. In: The Chinese Society for Metals, eds. TSCR’2002, Guangzhou, China, 2002, 194–198
Fu J, Wang Z B, Kang Y L, et al. Research and development of HSLC steels produced by EAF-CSP technology. J Univ Sci Tech Beijing (in Chinese), 2003, 25(5): 449–454
Liu D L, Fu J, Kang Y L, et al. Oxide and sulfide dispersive precipitation and effects on microstructure and properties of low carbon steels. J Mater Sci Tech, 2002, 18(1): 7–9
Kang Y L, Yu H, Fu J, et al. Morphology and precipitation kinetics of A1N in hot strip of low carbon steel produced by compact strip production. Mater Sci Eng A, 2003, 351(1–2): 265–271
Fu J. New generation low carbon steel-HSLC steel. The Chinese Journal of Nonferrous Metals (in Chinese), 2004, 14(suppl. 1): 82–90
Fu J, Kang Y L, Liu D L, et al. Nano-scale carbide and strengthening effect in low carbon steel produced by CSP process. J Univ Sci Tech Beijing (in Chinese), 2003, 25(4): 328–331
Weng Y Q, et al. Ultra Fine Grain Steel—The Theory and Control Technology of Structure Refinement of Steels (in Chinese). Beijing: Metallurgical Industry Press, 2003. 979
Turkdogan E T. Physical Chemistry of High Temperature Technology (in Chinese). Wei J H, Fu J trans. Beijing: Metallurgical Industry Press, 1988
Barin I. Thermochemical Data of Pure Substances (in Chinese). Cheng N L, Niu S T, Xu G Y et al. trans. Beijing: Science Press, 2003
Massalski T B. Binary alloy phase diagrams. ASM international®, 1996
Mao W M, Ren H P. Investigation of new structural steel strengthened by Cu precipitation (in Chinese). Transactions of Metal Heat Treatment, 1999, 20(1): 1–5
Mao W M, Ren H P. Development of structural steels containing copping. Iron and Steel (in Chinese), 2000, 35(6): 49–53
Liu D L, Kang Y L, Fu J, et al. Study of microstructure and mechanical properties of clean microalloyed steels. In: Liu G Q, Wang F M, Wang Z B, et al. eds. HSLA Steels’2000, Beijing: Metallurgical Industry Press, 2000. 267–271
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Supported by the National Natural Science Foundation of China (Grant No. 50334010), the State Foundation for Key Projects: New Generation of Steels (Grant No. G1998061500)
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Fu, J., Wu, H., Liu, Y. et al. Nano-scaled iron-carbon precipitates in HSLC and HSLA steels. SCI CHINA SER E 50, 166–176 (2007). https://doi.org/10.1007/s11431-007-0008-2
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DOI: https://doi.org/10.1007/s11431-007-0008-2