Research on microstructure and mechanical properties in warm rolling medium manganese steel with ult

• 作 者: CAOJiali;ZHAOAimin;HUANGYao;ZHENGHonghong;
• 机 构: National Engineering Research Center for Advanced Rolling Technology,University of Science and Techn
• 出 处: 第五届宝钢学术年会
• 发表日期: 2013年期

　　The microstructures and the mechanical properties of the medium manganese steel experienced warm rolling and annealing are investigated.And the transformation of reverted austenite in the steel is investigated by means of tensile testing in stages,scanning electron microscopy ( SEM) and X -rays diffraction ( XRD).It is shown that warm rolling and annealing after the hot rolling result in more reverted austenite,and excellent mechanical properties are gained with 859 MPa strength and 36% elongation.In the earlier stage of tensile deformation,serrate flow stress behavior is obviously observed because of the sustained TRIP effect produced by reverted austenite.And in the later stage of tensile deformation,serrate flow stress behavior disappeared.The ultrafine grain ferrite and martensite produce plastic deformation,and dislocation strengthening in the martensite becomes the main strengthening mechanism.