Study on Microstructure Refinement of Vanadium and Nitrogen Microalloyed Low Carbon Bainitic Steel

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GAO Fei WANG Ruizhen QIAN Tiancai China Central Iron and Steel Research InstituteBeijing ChinaKunming University of Science and TechnologyKunming YunnanChina [1 ,2 ,1 ,2 ,1 ,100081 ,2 ,650093 ]
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Journal of Iron and Steel Research(International). | 2011年 / 18(S1)卷 / International期
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摘要：
The effect of relaxation treatment after finish rolling on microstructure and mechanical properties has been investigated for a vanadium and nitrogen microalloyed low carbon bainitic steel.Finer lath bainite microstructure can be obtained in the plate with relaxation.The results of quantitative statistics show that in the plate without relaxation,80% of the total bainite lath bundles are in the range 5-15μm in length and 3-13μm in width,while in the plate with relaxation 80% of the total bundles are in the range 3-9μm in length and 1-7μm in width.The mechanical properties show that the plate with relaxation has higher impact energy,yield strength and hardness than the plate without relaxation,also the comprehensive performance after tempered at 650℃ is superior to the plate without relaxation.
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