北京科技大学学报Issue(11)：1465-1471,7.
超细晶中锰钢温轧强化增塑机理
Mechanism of strengthening and plasticity improvement in warm rolling medium manganese steel with ultrafine grains
摘要
Abstract
The deformation resistance of medium manganese steel at different temperatures was measured on a Gleeble-3500 thermo-simulator system. Reverted austenite transformation in medium manganese steel during warm rolling was investigated by means of tensile testing by stages, scanning electron microscopy (SEM), electron back scattered diffraction (EBSD), and X-ray diffraction (XRD). It is shown that warm rolling at 600℃and annealing after 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 sustained TRIP effect produced by reverted austenite. During the deformation, reverted austenite with a larger grain size is prior to transform because its stability is poor. In the later stage of tensile deformation, serrate flow stress behavior disappears. Ultrafine grain ferrite and martensite undergo plastic deformation, and martensite strengthening and dislocation strengthening of ferrite become the main strengthening mechanism.关键词
中锰钢/轧制/强化/塑性/奥氏体Key words
medium manganese steel/rolling/austenite/strengthening/plasticity分类
金属材料引用本文复制引用
曹佳丽,赵爱民,李振,尹鸿祥,黄耀..超细晶中锰钢温轧强化增塑机理[J].北京科技大学学报,2013,(11):1465-1471,7.基金项目
高等学校博士学科点专项科研基金资助项目(20110006110007) （20110006110007）
