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《Journal of University of Science and Technology Beijing》 2009-10
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Microstructure and fracture mechanism of 1000 MPa hot dip galvanized dual phase steel

JIN Guang-can1),ZHAO Zheng-zhi1),XU Gang1),ZHAO Ai-min1),LIU Guang-ming2)1)Research Institute of Metallurgy Engineering,University of Science and Technology Beijing,Beijing 100083,China 2)Shougang Research Institute of Technology,Beijing 100039,China  
1 000 MPa grade hot dip galvanized dual phase steel was produced by simulating the process of hot dip galvanizing.The fracture behavior of the dual phase steel was observed by in-situ tension experiment,and its fracture mechanism was further analyzed by SEM and TEM.The results show that dual phase steel(F+M)with a tensile strength of 1 022 MPa and an elongation of 9.5% can be obtained when the annealing temperature is 820 ℃.During the process of dynamic tension,new micro-cracks initiate in the plastic zone of crack tips and wave-like slip bands generate in ferrite grains in the plastic zone.When the crack meets martensite,it changes its propagation direction and get around the martensite island;but when the crack meets ferrite,the ferrite grain is plastically broken up through the way of joining micro-pores.The final fracture pattern is plastic fracture and the fracture morphology of the sample is a dimple pattern.
【Fund】: “十一五”国家科技支撑计划资助项目(No.2006BAE03A06);; 北京市科技计划资助项目(No.D07010300700701)
【CateGory Index】: TG142.1
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