粗大奥氏体晶粒中应变诱导铁素体形成特点

观察粗大奥氏体经不同应变后的淬火组织，分析应变诱导铁素体的形成特点．结果表 明：奥氏体晶粒尺寸影响应变诱导铁素作的形成方式；在形变初期粗大奥氏体（～２５０－μｍ）应变诱 导铁素体主要在晶界、退火孪晶界形核，随应变增加，可通过形变带形核：而尺寸较小的奥氏体 （～７ μｍ），铁素体形核主要在晶界；随奥氏体晶粒尺寸增大，形变带上形核比例明显提高，而在 晶界形核的比例减小．

Characterization of Strain Induced Ferrite Formed in Coarse Austenite Grained Q235 Steel

Strain induced ferrite in a coarse austenite grain Q235 steel was investigated in detail by analyzing samples subjected to different strains. Results revel that the strain induced ferrite formed was influenced by the size ofaustenite grain. Ferrite nucleated on grain boundaries, annealing twin boundaries in large y grained sample at the early stage of deformation and upon further straining on deformation bands. Whereas, ferrite nucleates mainly on grain boundaries in small Y grained samples being insensitive to strain scale. With the increase of y grain size, nucleation on the deformation bands was apparently increased and with respect to that on grain boundaries.