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《Iron & Steel》 2010-11
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Study on Section Homogeneity of V-N Microalloyed High Strength Flat Bulb Steel

CHEN Xue-hui,YANG Cai-fu,ZHANG Qian,SU Hang(Division of Structural Materials,Central Iron and Steel Research Institute,Beijing 100081,China)  
The effect of V-N microalloy on section homogeneity of mechanical properties of bulb flat steel is studied by optical microscopy,TEM,phase analysis and so on.The results show that V-N microalloy helps to improve section homogeneity of mechanical property for bulb flat steel,especially for strength enhancement in center of bulb.The above phenomena are closely associated with different precipitation behavior in different section positions of bulb flat steel.Due to the V(C,N) with enough kinetics of precipitation at center of bulb steel,the strengthening effect is better than that at other sites,which can compensate loss of strength because of different microstructures,and can decrease the difference of mechanical properties in the section of flat bulb steel.
【CateGory Index】: TG142.33
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