控制冷却对C-Mn钢力学性能的影响

采用MMS-300热力模拟实验机研究了某C-Mn钢铁素体动态相变前冷却速度对相变前奥氏体晶粒尺寸、室温铁素体晶粒尺寸的影响规律,同时在实验轧机上对实验钢的传统工艺、低温控轧工艺、非低温控轧工艺+前段快冷工艺进行了试轧.结果表明:①随着相变前冷却速度的增加,奥氏体晶粒尺寸呈逐渐减小趋势;②随着相变前冷却速度的增加,室温铁素体晶粒尺寸呈细化趋势;③非低温控轧工艺+前段快冷工艺取得了与低温控轧工艺相当的力学性能,且具有相对较低的屈强比.

Effects of Control Cooling on Mechanical Properties of C-Mn Steel

The effects of cooling rate on both austenite grain size and ferrite grain size at room temperature before ferrite transformation were investigated on MMS-300 thermomeehanical simulator with the specimens of a kind of C-Mn steel to which the trial rolling processes were done simultaneously on rolling mills with conventional low-temperature controlling and non-low temperature controlling plus forepart fast cooling technologies.Some results revealed that:①the austenite grain size decreases with the increasing cooling rate before ferrite transformation;②the ferrite grain size at room temperature becomes finer with the increasing cooling rate before ferrite transformation;③the excellent mechanical properties provided by the technology of non-low temperature controlling rolling plus forepart fast cooling are the same to that by the lowtemperature rolling technology,but the former has lower yield/tensile ratio.