应用Gleeble-1500D热模拟试验机对重轨钢BNbRE和U71Mn进行单道次压缩试验，测定850~1150℃下的真应力-真应变曲线，研究不同终轧温度和稀土元素对重轨钢动态再结晶的影响，并用扫描电镜观察变形后空冷的显微组织。结果表明，稀土元素能显著地抑制形变奥氏体的动态再结晶并细化珠光体片层间距。因此，稀土元素可抑制重轨钢动态再结晶，使其在较高终轧温度下仍能得到细小均匀的显微组织。
The ture stress-strain curves of BNbRE and U71Mn heavy rails from 850 to 1150℃ were measured by one-pass compression tests on Gleeble-1500D. The effects of finishing temperatures and RE on dynamic recrystallization were investigated. The air cooled microstructures after deformation were observed by SEM. The results show that dynamic recrystallization of deforming austenite being rolled can be prohibited significantly by adding RE and the finer spacing of pearlite is obtained. Therefore, fine and uniform microstructures can be obtained at higher finishing temperature by adding RE.
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