摘要
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,组织演变受合金元素的配分行为控制。与水冷样品相比,κ碳化物的析出导致炉冷和空冷样品的强度提升约200 MPa,铁素体和κ碳化物的晶界析出行为导致冲击吸收能量降低约100 J。
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 200 MPa 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 100 J.
作者
曹晨星
王存宇
张婧
曹文全
CAO Chenxing;WANG Cunyu;ZHANG Jing;CAO Wenquan(Institute for Special Steel,Central Iron and Steel Research Institute Co.,Ltd.,Beijing 100081,China)
出处
《钢铁研究学报》
CAS
CSCD
北大核心
2022年第3期272-279,共8页
Journal of Iron and Steel Research
基金
国家自然科学基金资助项目(51871062)。
