采用Gleeble 1500热模拟试验机研究了变形温度、变形速率、变形程度及奥氏体晶粒尺寸对新型Mn-Cr齿轮钢动态再结晶行为的影响.确定了该Mn-Cr齿轮钢的动态再结晶激活能Q及应力指数n分别为378.6 kJ/mol和5.81,在热轧齿轮钢管穿孔工序中,变形温度为1 100～1 150 ℃,变形量为40 %～54 %,奥氏体处于动态再结晶状态;而在轧管及减径工序中,变形温度分别为1 000～1 050 ℃和900～950 ℃,变形量分别为21 %和31%,奥氏体均处于加工硬化状态.
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