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本文研究了20Si Mn和含钛钢的奥氏体动态再结晶行为。在925～1225℃温度范围内进行了恒应变速率拉伸试验。在ε=1×10~(-2)S(-1)恒应变速率下,测定了动态再结晶的开始时间(R_(?))。在以上温度和恒应变速率下研究了微量钛对20Si Mn钢奥氏体动态再结晶行为的影响。动态再结晶-时间-温度(RTT)曲线系根据峰应变的数据绘制。结果表明:微量钛可使20Si Mn钢的动态RTT曲线稍右移,并在较低温度使动态RTT曲线产生偏折,即延迟了动态再结晶的开始时间。TiC的固溶阻碍了钢的奥氏体动态再结晶,TiC的沉淀也对奥氏体的动态再结晶起阻碍作用并使奥氏体形变阻力增加。
In this paper, the dynamic recrystallization of austenite of 20SiMn and titanium-containing steels has been investigated. A constant strain rate tensile test was carried out at a temperature in the range of 925-1225 ° C. The dynamic recrystallization start time (R_ (?)) Was measured at a constant strain rate of ε = 1 × 10 -2 S -1. The effects of trace titanium on austenite dynamic recrystallization of 20Si Mn steel were investigated at the above temperature and constant strain rate. Dynamic Recrystallization - Time-Temperature (RTT) curves are plotted against peak strain data. The results show that the trace titanium can shift the dynamic RTT curve of 20Si Mn steel slightly to the right, and deflect the dynamic RTT curve at lower temperature, which delays the start time of dynamic recrystallization. The solid solution of TiC hinders the dynamic austenite recrystallization of steel. The precipitation of TiC also hinders the dynamic recrystallization of austenite and increases the deformation resistance of austenite.