稀土对低碳微合金钢再结晶行为的影响

Effect of RE on Recrystallization Behavior of Low-Carbon Micro-Alloyed Steel

在实验室采用热模拟技术研究了稀土对低碳微合金钢再结晶行为的影响,结果表明,稀土成分对动态再结晶临界应变εD影响较明显,稀土量(质量分数,下同)达100×10-6与稀土量达60×10-6的试样其临界应变均高于未加稀土的试样,且当变形温度达到910℃,随着稀土量的增加不再发生再结晶,即加入稀土推迟了动态再结晶的发生,随着稀土加入量的增加推迟作用也越明显;双道次高温轧制时,稀土对静态再结晶软化率的影响要比低温轧制明显,与未加稀土的试样相比,加入100×10-6的稀土变形抗力会有一定的提高,道次间隙时间内再结晶容易发生,而稀土含量略少影响不显著。

By using the thermal simulation technology,the effect of RE on the recrystallization behavior of low-carbon micro-alloyed steel was investigated in the laboratory.The results show that,effect of RE composition on dynamic recrystallization critical strain εD is more obvious,the critical strain of RE content to 100×10-6 and RE content to 60×10-6 samples are higher than the without RE samples,and with the amount of RE increase,the recrystallization is no longer to occur when the deformation temperature reached 910 ℃,so dynamic recrystallization is delayed to occur by adding of RE,and the delayed effect was more obvious with the addition of rare earth increased.Effect of RE on double-pass static recrystallization softening rate at high-temperature is more obvious than that of low temperature rolling.And compared without RE samples,additting the appropriate amount of RE deformation resistance is improved obviously.So recrystallization easily occurs in the pass-interval times,while less rare earth content has no significant effect.