摘要
在 CSP机组上 ,通过普通碳素钢 (Q2 35 )的轧卡试验研究了该钢在连轧过程中的组织演变过程。结果表明 :高温区的两道次大变形使原始铸造树枝晶通过再结晶基本实现了奥氏体的等轴化和组织的均匀化 ;进一步变形可继续细化原始奥氏体并最终获得晶粒尺寸约为 30μm的、均匀的等轴晶组织。在 CSP工艺中 ,原始奥氏体组织细化可能与精轧总压下量高、单道次变形量大、应变速率高及钢中出现异常析出物等因素有关。
The microstructure evolution of mild carbon steel (Q235) has been investigated by analyzing the original austenite microstructure after each rolling pass in CSP. It was revealed that the two passes of heavy deformation (F1,F2) at high temperature is beneficial to the transformation of equiaxed crystal from casting dendritic crystal, also to the homogenization of the equiaxed crystal microstructure. Austenite grain size can be refined with multi pass deformation at lower temperature, finally, a homogenous and equiaxed austenite with about 30 μm in grain size could be obtained.For CSP processing the refinement of the microstructure maybe caused by higher total reduction of continuous rolling, single pass heavy deformation, higher strain rate and unusual precipitates in the steel.
出处
《钢铁》
CAS
CSCD
北大核心
2003年第7期12-15,共4页
Iron and Steel
