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运用Gleeble-3500热力模拟试验机对700~1200℃温度范围内高锰钢Mn13单独加入钛(质量分数0.10%)、复合添加钛(质量分数0.11%)和钒(质量分数0.20%)后的高温热延性进行测试.采用扫描电镜和X射线能谱分析仪对不同温度下拉伸断裂后试样的断口形貌以及断口处的析出粒子进行了分析.温度-断面收缩率曲线表明在高锰钢中加入0.10%钛后,其断面收缩率出现了一定程度的下降,这表明钛的加入恶化了高锰钢的热延性;在此基础上加入0.20%钒,高锰钢的热延性出现了进一步的下降,即钛和钒的复合加入严重恶化了高锰钢的热延性.利用Thermo-Calc热力学计算软件对单独含钛以及复合含钛钒的高锰钢在700~1600℃存在的平衡析出相进行了计算,计算结果表明Ti(C,N)的平衡析出温度均约为1499℃,远大于其液相线温度,这说明Ti(C,N)在高锰钢的液相中就可以开始析出.扫描电镜-能谱分析结果表明在奥氏体晶界以及三叉晶界处存在大量的Ti(C,N)和(Ti,V)C粒子,这些粒子的出现抑制了动态再结晶的发生,并且加速了晶界附近裂纹的扩展.
Using Gleeble-3500 thermal simulation test machine, the high manganese content in the high manganese steel Mn13 with the addition of titanium (mass fraction 0.10%), titanium (mass fraction 0.11%) and vanadium (0.20% Hot ductility was tested.The morphology of the fracture surface and the precipitated particles at the fracture were analyzed by scanning electron microscopy and energy dispersive X-ray spectrometer.The curves of temperature-area shrinkage showed that in high manganese steel After adding 0.10% titanium, the reduction in area decreased to a certain degree, which indicates that the addition of titanium deteriorates the hot ductility of high manganese steel. On the basis of adding 0.20% vanadium, the hot ductility of high manganese steel appears further , That is, the addition of titanium and vanadium seriously worsen the hot ductility of high manganese steel.The use of Thermo-Calc thermodynamic calculation software alone titanium and titanium composite vanadium high manganese steel at 700 ~ 1600 ℃ exist equilibrium precipitation phase The calculation results show that the equilibrium precipitation temperature of Ti (C, N) is about 1499 ℃, which is much larger than the liquidus temperature, indicating that Ti (C, N) can start in the liquid phase of high manganese steel Precipitated. SEM - EDS results show that in Ti’s large number of grain boundaries and the grain boundary trigeminal (C, N) and (Ti, V) C particles, these particles appeared to suppress the occurrence of dynamic recrystallization and accelerates the crack propagation near the grain boundary.