INFLUENCE OF NITROGEN ADDITION ON TRANSFORMATION BEHAVIOR AND MECHANICAL PROPERTIES OF VANADIUM MICROALLOYED STEELS
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.
Vanadium microalloyed steel Nitrogen addition Planar lattice misfit degree Intragranular ferrite transformation
Jiangnan MA Ruizhen WANG Caifu YANG
Department of Engineering Steels,Central Iron and Steel Research Institute,76 Xueyuan Nanlu,Haidian,Beijing,100081,China
国内会议
杭州
英文
1163-1169
2015-11-11（万方平台首次上网日期，不代表论文的发表时间）