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《Journal of Materials Engineering》 2010-09
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Microstructure and Property of 800MPa Cold Rolled Hot Dip Galvanized Dual Phase Steel and Its Texture Evolution

JIN Guang-can1,ZHAO Ai-min1,ZHAO Zheng-zhi1,TANG Di1,LIU Li2,ZHOU Jian2(1 Research Institute of Metallurgy Engineering,University of Science and Technology Beijing,Beijing 100083,China;2 Institute for Research of Shou Steel,Beijing 100039,China)  
Microstructures of hot rolled,cold rolled and hot dip galvanized annealed samples were observed,mechanical properties of hot rolled and hot dip galvanized annealed samples were analyzed and compared.At the same time,process of texture evolution was studied.The results show that annealed at 820℃ and soaked 140s,the tensile strength and total elongation of hot dip galvanized dual phase steel reach 819MPa and 17% respectively with F+M microstructure.The size of ferrite crystal grain is 1.5-4μm,the volume fraction of martensite is about 34%.The density of hot rolled texture is week,but γ-fiber texture is formed weekly;after cold rolling,α-fiber and γ-fiber texture both develop remarkably;after hot dip galvanized annealing,α-fiber texture changes very little,but {001}〈110〉 texture increases notably.The orientation density of γ-fiber texture greatly fluctuates,the texture component {112} 〈110〉 possesses of maximum amount.The martensite particle which is formed in the process of rapid cooling hinders the development of favorable texture {111},so it makes that the disadvantage texture {001} 〈110〉 has a great extent increasing.
【Fund】: 十一五国家科技支撑计划项目(2006BAE03A06);; 北京市科技计划资助项目(D07010300700701)
【CateGory Index】: TG335.22;TG156.2
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