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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850～1 150℃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 single-pass compression tests of heavy rail steel BNbRE and U71Mn were carried out by Gleeble-1500D thermal simulation tester. The true stress-true strain curves of 850-115 ℃ were measured. The effects of different finishing temperature and rare earth elements on the dynamic state of heavy rail steel The effect of recrystallization was observed. The microstructure of air cooled after deformation was observed by scanning electron microscope. The results show that rare earth elements can significantly inhibit the dynamic recrystallization of deformed austenite and refine the pearlite layer spacing. Therefore, rare earth elements can inhibit the dynamic recrystallization of heavy rail steel, so that it can still get fine uniform microstructure at higher finishing temperature.