Effect of Niobium on Transformations From Austenite to Ferrite in Low Carbon Steels  

作　　者：Parker Sally Rose Andrew West Geoff Thomson Rachel 

机构地区：[1]Steel Metallurgy Department,Tata Steel RD and T,Swinden Technology Centre,Rotherham,S60 3AR,UK [2]Department of Materials,Loughborough University,Loughborough,LE11 3TU,UK

出　　处：《Journal of Iron and Steel Research International》2011年第S1期208-212,共5页

摘　　要：Niobium has an important effect on the transformation behaviour,grain size refinement and precipitation strengthening during hot rolling and subsequent cooling in low carbon steels,with even a low content of niobium having a strong effect on the transformation rate from austenite to ferrite.However,the effects of niobium on transformation behaviour have not been fully characterised and understood to date.This paper examines in detail austenite grain growth as a function of austenitisation time in high strength low alloy (HSLA) steels with three different niobium contents,together with the effect of niobium on the isothermal transformation kinetics from austenite to ferrite as a function of temperature.It is shown that austenite has the slowest grain growth rate in the steel with the highest niobium content.When austenite grain sizes are consistent,the steel with the highest niobium content was found to have the slowest transformation rate from austenite to ferrite.Niobium has an important effect on the transformation behaviour,grain size refinement and precipitation strengthening during hot rolling and subsequent cooling in low carbon steels,with even a low content of niobium having a strong effect on the transformation rate from austenite to ferrite.However,the effects of niobium on transformation behaviour have not been fully characterised and understood to date.This paper examines in detail austenite grain growth as a function of austenitisation time in high strength low alloy (HSLA) steels with three different niobium contents,together with the effect of niobium on the isothermal transformation kinetics from austenite to ferrite as a function of temperature.It is shown that austenite has the slowest grain growth rate in the steel with the highest niobium content.When austenite grain sizes are consistent,the steel with the highest niobium content was found to have the slowest transformation rate from austenite to ferrite.

关 键 词：NIOBIUM transformation kinetics austenite grain growth low carbon steels 

分 类 号：TG142.31[一般工业技术—材料科学与工程]