Effect of Solute Elements and Cooling Rate on Strain in Brittle Temperature Range of Continuously Cast Strand  

作　　者：Hui ZHANG Yi FAN Ming-lin WANG Hong-biao TAO 

机构地区：[1]National Engineering Research Center of Continuous Casting Technology,Central Iron and Steel Research Institute [2]School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing

出　　处：《Journal of Iron and Steel Research International》2015年第3期207-212,共6页

基　　金：Item Sponsored by National Basic Research Program of China(2010CB630806-2)

摘　　要：A micro-segregation model of solute elements in mushy zone with δ/γ transformation during solidification was established based on the regular hexagon transverse cross section of dendrite shape proposed by finite difference method under the non-equilibrium solidification condition. The model was used to calculate the non-equilibrium pseudo binary Fe-C phase diagram and the strain of steels induced by variation of temperature in brittle temperature range. On the basis of the phase diagram and the strain, the strain curve in brittle temperature range as a function of carbon content for continuously fast strand was introduced and obtained, Solute elements change the position of the strain curve. And cooling rate changes the position arid the shape of the strain curve. The comprehensive formula of the strain as functions of solute elements and cooling rate in brittle temperature range has been obtained by nonlinear fitting program.A micro-segregation model of solute elements in mushy zone with δ/γ transformation during solidification was established based on the regular hexagon transverse cross section of dendrite shape proposed by finite difference method under the non-equilibrium solidification condition. The model was used to calculate the non-equilibrium pseudo binary Fe-C phase diagram and the strain of steels induced by variation of temperature in brittle temperature range. On the basis of the phase diagram and the strain, the strain curve in brittle temperature range as a function of carbon content for continuously fast strand was introduced and obtained, Solute elements change the position of the strain curve. And cooling rate changes the position arid the shape of the strain curve. The comprehensive formula of the strain as functions of solute elements and cooling rate in brittle temperature range has been obtained by nonlinear fitting program.

关 键 词：solute element cooling rate non-equilibrium pseudo binary Fe-C phase diagram strain  brittle temperature range 

分 类 号：TF777[冶金工程—钢铁冶金]