Q235碳素钢应变强化相变中铁素体的取向特征

ORIENTATIONAL CHARACTERISTICS OF FERRITEDURING STRAIN ENHANCED TRANSFORMATIONIN A Q235 PLAIN CARBON STEEL

利用背散射电子衍射取向成像技术分析了在热模拟单向压缩条件下Q235碳素钢应变强化相变中铁素体晶粒的取向(差)变化特点.结果表明,奥氏体的状态影响应变诱导出的铁素体的取向.奥氏体的动态再结晶使应变诱导出的铁素体的取向随机分布,在铁素体的内部基本上没有小角晶界.随着形变温度的降低和应变量的增大,铁素体取向的择优性变强,铁素体内部的小角晶界增加,这是细小铁素体动态再结晶的表现.相变、形变以及铁素体的动态再结晶都影响<111>方向线织构的形成.

Ferrite (mis) orientations of Q235 plain carbon steels are determined by orientation mapping of EBSD analyzing technique. Results show that ferrite orientations are influenced by the state of austenite. Austenite dynamic recrystallization leads to a random orientation distribution of ferrite induced by strain and rather less small angle grain boundaries within ferrite grains. As the deforming temperature decreases or strain increases (111) fiber texture is strengthened and small angle grain boundaries increase, this is due to the occurrence of ferrite dynamic recrystallization. Transformation, deformation and recrystallization all contribute to the (111) fiber texture.