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Effects of carbon content on the microstructure and tensile properties of a low-density steel
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Carbon can change the phase components of low-density steels and influence the mechanical properties.In this study,a new method to control the carbon content and avoid the formation of δ-ferrite by decarburization treatment was proposed.The microstructural changes and mechanical characteristics with carbon content induced by decarburization were systematically examined.Crussard-Jaoul(C-J)analysis was employed to examine the work hardening characteristics during the tensile test.During decarburization by heat treat-ments,the carbon content within the austenite phase decreased,while Mn and Al were almost unchanged;this made the steel with full austenite transform into the austenite and ferrite dual phase.Meanwhile,(Ti,V)C carbides existed in both matrix phase and the mole frac-tion almost the same.In addition,the formation of other carbides restrained.Carbon loss induced a decrease in strength due to the weak-ening of the carbon solid solution.For the steel with the single austinite,the deformation mode of austenite was the dislocation planar glide,resulting in the formation of microbands.For the dual-phase steel,the deformation occurred by the dislocation planar glide of aus-tenite first,with the increase in strain,the cross slip of ferrite took place,forming dislocation cells in ferrite.At the late stage of deforma-tion,the work hardening of austinite increased rapidly,while that of ferrite increased slightly.
Key Laboratory of Superlight Materials and Surface Technology,Ministry of Education,College of Materials Science and Chemical Engineering,Harbin Engin-eering University,Harbin 150001,China
State Key Laboratory of Metal Material for Marine Equipment and Application,Iron & Steel Research Institute of Ansteel Group Corporation,Anshan 1 14009,China
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