Hardenability of Low Carbon Vanadium Microalloyed Steels
LI Xiao-xian1,2, SUN Xin-jun2, YANG Geng-wei1,2, LI Zhao-dong2, YU Lan1, YONG Qi-long2
1. Department of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China;
2. Department of Structural Steels, Central Iron and Steel Research Institute, Beijing 100081, China
Abstract:By using Jominy end quench test and combining with thermodynamic calculation of vanadium carbide precipitation, the influence of vanadium on the hardenability of low carbon steels was investigated. The results indicate that the hardenability of the experimental steels are improved by increasing the total content of V. The thermodynamic calculation results show that the concentration of V in solution increases with the increasing content of V in 0.22C steel at 880℃. The VC particles precipitate in austenite when the V content is more than 0.137%(mass fraction) in steel, and the concentration of C in solution decreases. The ideal critical diameter of experimental steels is calculated by comprehensive consideration of the concentration of V and C in solution and the prior austenite grain size.The variation trend of ideal critical diameter agrees well with the experimental results.
[1] 雍岐龙, 马鸣图, 吴宝榕. 微合金-物理与力学冶金[M]. 北京: 机械工业出版社,1989.81-85.
[2] 杨才福, 张永权, 王瑞珍. 钒钢冶金原理与应用[M]. 北京: 冶金工业出版社,2012.54-56.
[3] HAN X Y. Functions of Nb,V and Ti in micro-alloyed steel[J]. Wide and Heavy Plate,2006,12(1):39-41.
[4] CHARLEUX M, POOLE W J, MILITZER M, et al. Precipitation behavior and its effect on strengthening of an HSLA-Nb/Ti steel[J].Metallurgical and Materials Transactions A,2001,32(7):1635-1647.
[5] DUNLOP G L, CARLSSON C J, FRIMODIG G. Precipitation of VC in ferrite and pearlite during direct transformation of a medium carbon microalloyed steel[J]. Metallurgical Transactions A,1978,9(2):261-266.
[6] 项程云.合金结构钢[M].北京:冶金工业出版社,1999.279-283.
[7] ZHANG J, ZHANG K J. Strengthening mechanism and application of microalloying element vanadium in plate[J]. Sichuan Metallurgy,2009,31(2):15-18.
[8] ZAJAC S. Extended use of vanadium in a new generation of flat rolled steels[A]. International Seminar 2005 on Application Technologies of Vanadium in Flat-rolled Steels[C]. Suzhou, China:Vanitec Publication,2005.52-63.
[9] YANY G W, LI Z D, SUN X J, et al. Ultrafine-grained austenite in a low carbon vanadium microalloyed steel[J]. Iron Steel Res Int,2013,20(4):64-69.
[10] ADRIAN H. A mechanism for effect of vanadium on hardenability of medium carbon manganese steel[J].Materials Science and Technology,1999,15(4):366-378.
[11] GARBAZ B, PICKERING F B. Effect of vanadium and austenitising temperature on hardenability of (0.2-0.3)C-1.6Mn steels with and without additions of titanium, aluminium, and molybdenum[J]. Materials Science and Technology,1988,(4):117-126.
[12] 大和久重雄. 淬透性: 测定方法和应用[M]. 赵之昌, 才鸿年, 译.北京:新时代出版社,1984.30-47.
[13] GRANGE R A. Estimating the hardenability of carbon steels[J]. Metallurgical and Materials Transactions B,1973,4(10):2231-2244.
[14] 吴季恂. 钢的淬透性应用技术[M]. 北京:机械工业出版社,1994.121-125.
[15] 黄刚, 吴开明, 周峰, 等. 薄板坯连铸轧生产65Mn 钢的CCT曲线和淬透性[J]. 材料工程,2012,(4):52-61. HUANG G, WU K M, ZHOU F, et al. CCT diagram and hardenability of 65Mn steel produced by compact strip production[J]. Journal of Materials Engineering,2012,(4):52-61.
[16] GROSSMANN M A. Hardenability calculated from chemical composition[J]. Transactions of the Metallurgical Society of AIME,1942,154:227-255.
[17] 雍岐龙. 钢铁材料中的第二相[M]. 北京:冶金工业出版社, 2006.146-165.