【摘 要】
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The influence of nitrogen addition on the microstructure and mechanical properties of vanadium microalloyed steels was studied by thermal simulation and bench scale rolling experiment.The results show
【机 构】
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Department of Engineering Steels,Central Iron and Steel Research Institute,76 Xueyuan Nanlu,Haidian,
论文部分内容阅读
The influence of nitrogen addition on the microstructure and mechanical properties of vanadium microalloyed steels was studied by thermal simulation and bench scale rolling experiment.The results show that addition of nitrogen enhances the starting temperature of transformation,and promotes the formation of intragranular ferrite.Increasing nitrogen promotes acicular ferrite formation,and refines MA constituent.Increasing vanadium promotes the precipitation strengthening,but has little effect on toughness.For steel rich of nitrogen,vanadium mainly precipitates in austenite in the form of VN.For low nitrogen steels,however,vanadium precipitates as VC in ferrite.The lattice misfit degree of austenite-ferrite,VC-ferrite and VNferrite are 6.72%,3.89%and 1.55%respectively.It indicates that VN precipitated in austenite acts as preferential nucleation sites and promotes the intragranular ferrite transformation.
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