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| Influence of Finishing Cooling Temperature and Holding Time on Nanometer-size Carbide of Nb-Ti Microalloyed Steel |
| Hai-long YI,Yang XU,Ming-xue SUN,Zhen-yu LIU,Guo-dong WANG |
| State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, Liaoning, China |
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Abstract The nanometer-size carbides formed in ferrite matrix of Nb-Ti microalloyed steel at different finishing cooling temperatures and holding time have been investigated. The characteristics of nanometer-size carbides in ferrite were observed by transmission electron microscopy, and mechanical properties of ferrite were detected by a nano-hardness tester. The results showed that interphase precipitation and diffusion precipitation were observed at different finishing cooling temperatures, and the interphase precipitation was planar and curved. Sheet spacing of interphase precipitation increased with the increase of finishing cooling temperature and changed a little when holding for 50-1000 s. Interphase precipitation shows higher nano-hardness at 640 �� compared with diffusion precipitation at 600 ��, and the contribution of interphase precipitation to the mechanical properties of ferrite was larger than that of diffusion precipitation.
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Received: 12 October 2012
Published: 15 April 2014
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| Fund:Projects Sponsored by the National Natural Science Foundation of China |
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Corresponding Authors:
Yi HaiLong
E-mail: yihl@ral.neu.edu.cn
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| [1] |
Bin-hao HU,Qing-wu CAI,Hui-bin WU. Influence of Mo on Growth and Coarsening of Nanometer-sized Carbides in Low-alloy Ferritic Steels Containing Ti[J]. Chinese Journal of Iron and Steel, 2014, 21(9): 878-885. |
| [2] |
Xiao-pei WANG,,Ai-min ZHAO,Zheng-zhi ZHAO,Yao HUANG,Zhi-da GENG,Yang YU. Precipitation Strengthening by Nanometer-sized Carbides in Hot-rolled Ferritic Steels[J]. Chinese Journal of Iron and Steel, 2014, 21(12): 1140-1146. |
| [3] |
YANG Gang;et al. Embrittlement Mechanism due to Slow Cooling During Quenching for M152 Martensitic Heat Resistant Steel[J]. Chinese Journal of Iron and Steel, 2010, 17(6): 60-66. |
| [4] |
LOU Yan��zhi;LIU De��lu;NI Xiao��qing. Precipitates in Steels With Ti Additive Produced by CSP Process[J]. Chinese Journal of Iron and Steel, 2009, 16(4): 60-0. |
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2014, Vol. 21 
