1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083,China 2. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China
The precipitation behavior of a 800MPa grade high strength low carbon steel microalloyed with Ti and Nb was investigated. The transmission electron microscope and selected area diffraction combined with EDS analysis were used to identify the precipitates under different tempering temperature. The investigation shows that several complex precipitates are present in the steel after tempering. Nano-precipitates in the steel can be divided into two categories according to size, the large-size particles precipitated during rolling deformation, and the small size induced by phase change after tempering; Along with the increase of temperature, precipitation in the steel will be slowly growing up and roughing according with the typical Oswald ripening mechanism. There is a specific orientation relationship between precipitation and matrix, with the substrate interface basic relationship in the beginning of precipitation, and the shape of precipitation relative to spherical or spherical. With the temperature increasing, precipitates gradually grow up and coarsen gradually into a square or oval shape, and simultaneously break away the coherent interface with the substrate, the interface turns to the following relationship: {100}MC∥{100}α-Fe, <100>MC∥<110>α-Fe.
ZUO Long-fei，NI Rui，WANG Zi-dong，CHEN Xiao-hua.
Nano-Precipitates in Low Carbon High Strength Steel During the Tempering Process[J]. Journal of Iron and Steel Research, 2013, 25(03): 39-45
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, [1] 翁宇庆，杨才福，尚成嘉．低合金钢在中国的发展现状与趋势[J]．钢铁，2011，46(9)：1-10.
[2] 韩孝永．铌、钒、钛在微合金钢中的作用[J]．宽厚板，2006，12(1)：39-41．
[3] 东涛．我国含铌钢产品的应用前景和现状[C]．2008低合金钢年会论文集．北戴河：2008．
[4] 贺信莱，尚成嘉，杨善武，等. 高性能低碳贝氏体钢——成分、工艺、组织、性能与应用[M]. 北京：冶金工业出版社，2008.
[5] Dunne D P，Feng B，Chandra T．The effect Ti and Ti-Nb additions on α formation and restoration during intercritical rolling and holding of C-Mn structural steels[J]，ISIJ Int，1991，31(11)：1354-1361.
[6] Suzuki K，Miqagawa S，Saito Y，et al．Effect of microalloyed nitride formation elements on precipitation of carbonitride and high temperature ductility of continuously cast low carbon Nb containing steel slab[J]．ISIJ Int.，1995，35(1)：34-41.
[7] 雍岐龙．铁材料中的第二相[M]．北京：冶金工业出版社，2006．
[8] S G Hong，H J Jun，K B Kang，et al．Evolution of precipitates in the Nb-Ti-V microalloyed HSLA steels during reheating[J]．Scripta Materialia，2003，48：1201-1206．
[9] Dhua S K，Amitava Ray，Sama D S．Effect of tempering temperatures On the mechanical properties and mierostrueture of HSLA-100 type copper baring steels[J]．Materials Science and Engineering A，2001(318)：197-210．
[10] Das S. Microstructural Characterization of Controlled Forged HSLA-80 Steel by Transmission Electron Microscopy[J]. Materials Characterization， 2003(50): 305-311.
