In this work, the mechanical and metallurgical behavior of titanium added ultra-low carbon (ULC-Ti) steel under hot and warm working conditions was studied by means of dilatometer compression tests. Double compression schedules were performed at temperatures between 700 °C and 1000 °C, inter-pass times of 0,5−100 s, and deformations of 0.5 and 0.3 in the first and second stages, respectively, with strain rate of 1 s⁻¹. The analysis of the flow curves obtained allowed the evaluation of the softening characteristics of the steel. The softening and microstructure features indicate different restoration mechanisms depending of the temperature range. Static recrystallization with rapid microstructure restoration is observed at temperatures within the austenitic and intercritical region. Strain induced boundary motion and recovery mechanisms apparently control the restoration process in the ferrite region. In general, flow stress curves showed dynamic recovery behavior. Only the deformation in the intercritical region produced a peak in the flow stress curves. Isothermal holding tests associated with single hit compression indicated the presence of dynamic strain induced transformation, accelerating the softening kinetics at the intercritical region.

在这项工作中，通过膨胀计压缩试验研究了添加钛的超低碳（ULC-Ti）钢在高温和高温条件下的力学和冶金性能。双压缩时间表物在700℃和1000℃之间的温度下进行，的0,5-100 s，且在第一和第二阶段，分别为0.5和0.3的变形道次间时间，以1秒的应变速率^{- 1个}。对获得的流动曲线的分析可以评估钢的软化特性。根据温度范围，软化和微观结构特征表明不同的恢复机制。在奥氏体和临界区之间的温度下观察到具有快速组织恢复的静态重结晶。应变引起的边界运动和恢复机制显然控制着铁素体区域的恢复过程。通常，流动应力曲线显示出动态恢复行为。仅在临界区中的变形在流动应力曲线中产生峰值。与单次冲击压缩相关的等温保持测试表明存在动态应变诱导的相变，从而加速了临界区之间的软化动力学。