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利用EBSD技术研究了冷轧中锰钢在退火过程中的组织演化规律,从而揭示了其硬度变化的原因。研究结果表明:冷轧中锰钢在650℃退火,获得了0.3～0.6μm等轴状奥氏体和铁素体的超细晶组织,且随着退火时间的延长组织结构没有发生明显粗化;在550～650℃退火,随着温度的升高,奥氏体含量不断增加;在700℃退火时,奥氏体稳定性降低,出炉空冷过程中发生了马氏体转变,硬度升高;逆转变奥氏体相的稳定性主要受其碳含量控制,碳含量越高越容易获得大量稳定的逆转变奥氏体。
The EBSD technique was used to study the microstructure evolution of the cold-rolled medium manganese steel in the annealing process, and the reasons for its hardness change were revealed. The results show that the ultrafine grain structure of austenite and ferrite with 0.3-0.6 μm equiaxed austenite and ferrite is obtained after annealing of the cold-rolled medium manganese steel at 650 ℃, and the microstructure is not obviously roughened with the extension of annealing time ; At 550 ~ 650 ℃ annealing, the austenite content increases with the increase of temperature; the austenite stability decreases at 700 ℃ annealing, the martensite transformation occurs during the air cooling process, and the hardness increases; The stability of the retrograded austenite phase is mainly controlled by its carbon content. The higher the carbon content, the easier it is to obtain a large amount of stable reversed austenite.