CSP工艺条件下稀土对低碳结构钢热轧过程中再结晶行为的影响

Effect of Rare Earths on Recrystallization of Low-Carbon Structural Steel During Hot Deformation by CSP

为研究稀土在CSP连续轧制过程中对低碳结构钢再结晶行为影响,采用Gleeble-1500热模拟机,对加稀土和未加稀土的低碳结构钢进行了单道次、双道次热压缩实验,并且对加稀土和未加稀土的低碳结构钢进行CSP工艺的模拟,比较金相照片及真应力-应变曲线。实验结果表明:稀土提高了低碳结构钢的动态再结晶临界应变εD,在一定温度下降低静态软化率;并且在CSP热轧过程中采用加入稀土的方法,最终获得较未加稀土试样更为细小的晶粒组织。

In order to investigate the effects of rare earth on recrystallization of low-carbon structural steel during continuous rolling by CSP,the single-pass,double-pass and CPS multi-pass rolling simulation tests of low-carbon structural steel both with rare earth and without rare earth were processed by Gleeble-1500 thermal simulator,and then the true stress-strain curves and microstructure were compared.The results showed that the rare earth could restrain recrystallization and reduce recovery rate at a certain temperature.Such a feature of rare earth could be used to refine grain size of low-carbon structural steel by CSP.