低碳-硅-锰系TRIP钢的组织演变规律研究

采用彩色金相、SEM、TEM和X射线衍射技术研究了低碳-硅-锰TRJP钢在单向拉伸状态下的组织演变规律.结果表明,TRIP钢变形前的组织为F、B和残余奥氏体,经拉伸变形后部分残余奥氏体在应变作用下转变为孪晶结构的马氏体,提高了钢的强度;TRIP钢的断裂为韧性断裂,位于F晶界处的残余奥氏体发生相变从而松弛了应力,延缓了断裂的产生,使TRIP钢板获得高塑性.

Research on Microstrueture Evolution Laws of Low-C-Si-Mn TRIP Steels

The microstructure evolution law of C-Si-Mn TRIP steels in single tensile state was researched using color metallographic SEM, TEM and X-ray diffraction technology. The results show that the microstructure of TRIP steels before deformation is ferrite, bainite and retained austenite, and a part of retained austenite is transformed into martensite with twining structure under tensile strain, which increases the strength of TRIP steel. The fracture of TRIP steels is ductility, the phase transformation of the retained austenite in ferrites grain boundaries relaxes stress and delays fracture, and obtains high plasticity of TRIP steels.