11.稀土对D36 船板钢再结晶行为的影响*

 郭冬青1，林震2，彭峰1，3，任慧平1，金自力1

( 1．内蒙古科技大学材料与冶金学院，内蒙古包头014010; 2．包钢集团无缝钢管厂，内蒙古包头014010; 3．包钢集团技术质量部，内蒙古包头014010)

关键词: 稀土; D36 船板钢; 动态再结晶; 临界应变; 静态软化率

中图分类号: TG113 文献标识码: A

摘要: 在实验室采用热模拟技术研究稀土对D36 船板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 ℃以下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，适量加入100 × 10 － 6稀土其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，而稀土含量少影响不显著．

Effect of RE on recrystallization behavior of D36 ship plate steel GUO Dong-qing1，LIN Zhen2，PENG Feng1，3，REN Hui-ping1，JIN Zi-li1

( 1． Materials and Metallurgy School，Inner Mongolia University of Science and Technology，Baotou 014010，China; 2． Seamless Steel Tube Plant，Baogang Group，Baotou 014010，China; 3． Quality and Technology Department，Baogang Group，Baotou 014010，China)

Key words: rare earth; D36 ship plate steel; critical strain εD for dynamic recrystallization; static softening rate

Abstract: The effect of RE on the recrystallization behavior of D36 ship plate steel was studied by using the thermal simulation technology in the laboratory． The results showed that，the effect of RE composition on dynamic recrystallization critical strain was obvious，for

the critical strains of the samples with different RE content were all higher than those without RE; with the amount of RE increased，the recrystallization was no longer to occur when the deformation temperature reached 910 ℃ ，so the occurrence of the dynamic recrystallization was delayed by the addition of RE; with the addition of rare earth increased ，the delaying effect was more obvious． The influence of RE on double-pass static recrystallization softening rate at high-temperature rolling is more obvious than at low temperature rolling．Compared with samples without RE，adding an appropriate amount of RE can improve the deformation resistance obviously，making recrystallization

occur easily in the pass-interval times，but no significant effect is observed with little rare earth added．