冷却速率对奥氏体型FeMnAlC钢组织和性能的影响

利用SEM、TEM、XRD、EPMA等手段,研究了水冷、空冷和炉冷对奥氏体基FeMnAlC钢微观组织和力学性能的影响.研究结果表明,3种冷却工艺都获得了以奥氏体为基体的微观组织,均含有大量孪晶,随冷却速度的降低,沿晶界析出的铁素体和κ碳化物逐渐增多,微观结构呈现出从以位错为主到调制结构再到矩形畴界的转变过程,组织演变受...

Effect of cooling rate on microstructure and properties of austenitic FeMnAlC steel

The effects of water cooling, air cooling and furnace cooling on microstructure and mechanical properties of austenitic FeMnAlC steel were investigated by SEM, TEM, XRD and EPMA. The results show that the microstructure with austenite as the matrix is obtained by the three cooling processes, and there are a large number of twins. With the decrease of cooling rate, the ferrite and κ carbides precipitated along the grain boundary gradually increase, and the microstructure presents a transformation process from dislocation based to modulation structure and then to rectangular domain boundary. The microstructure evolution is controlled by the distribution behavior of alloy elements. Compared with the water cooled sample, the precipitation of κ carbides leads to the strength increase of about 200MPa for furnace cooled and air cooled samples, and the grain boundary precipitation behavior of ferrite and κ carbides leads to the decrease of impact absorption energy by about 100J.