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《Materials for Mechanical Engineering》 2013-01
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Effect of Controlled Rolling and Cooling in Non-recrystallization Zone on Microstructure of Low Carbon High Niobium Steel

ZHONG Rong1,ZHANG Zhi-Bo2,YIN Shu-biao2,LIU Qing-you3,WANG Hua-kun1(1.Faculty of Material Science and Engineering;2.Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology,Kunming 650093,China;3.Institute of Structural Materials,Central Iron and Steel Research Institute,Beijing 100081,China; 4.Wuhu Xingxing Ductile Pipe Co.,Ltd.,Wuhu 241002,China)  
Microstructure of low carbon high niobium steel under the conditions of different controlling rolling and cooling parameters was studied by thermomechanical simulator.The results show that the amount of ferrite increased and the amount of bainite decreased with the decrease of temperature and the increase of deformation,and the morphology of the lathe bainite became granular gradually.When the cooling rate was lower than 5 ℃·s-1,the microstructure was constituted by ferrite and pearlite,and when the cooling rate was higher than 5 ℃·s-1,the amount of bainite increased and the grains were smaller and more uniform.The micro-hardness of tested steel increased with the increase of cooling rate.
【Fund】: 高等学校博士学科点专项科研基金资助项目(20105314120008);; 云南省自然科学基金资助项目(2009ZC004X)
【CateGory Index】: TG335.11
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