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《Iron & Steel》 2013-01
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Low-Temperature-Precipitation Behavior of Nb Under Ultra-Fast Cooling Process

YANG Hao,ZHOU Xiao-guang,LIU Zhen-yu,WANG Guo-dong(The State Key Laboratory of Rolling and Automation,Northeastern University, Shenyang 110819,Liaoning,China)  
With a kind of ship plate steel containing Nb,the precipitation behavior of Nb in transformation region was mainly studied through thermal simulator experiments and laboratory rolling test,and the dynamic continuous cooling transformation(CCT) diagrams for tested steel was gained.The results show that: the acicular ferrite is gained when the deformed sample was held at the quickly cooling finish temperature 600 ℃ for different holding time,while held at 650 ℃,the content of polygonal ferrite increases with holding time prolonged;the number and the size of precipitation particles also increase with holding time prolonged at different temperatures;in laboratory rolling experiment,comparing with finishing temperature 850 ℃ using laminar cooling process,finish rolling at 910 ℃ with ultra-fast cooling(UFC) process can gain more precipitation particles in microstructure,so the precipitation strengthening was enhanced and the strength do not decrease at higher finishing temperature;UFC process not only can improve precipitation hardening for niobium,but also can decrease the rolling load and increase the rolling pace because of higher finishing temperature.
【Fund】: 国家自然科学基金资助项目(51004037);; 中央高校基本科研业务费专项资金资助(N090307002)
【CateGory Index】: TG335.11
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