铁素体轧制对普通用冷轧钢板组织和性能的影响

采用光学显微镜和扫描电镜对比研究了铁素体区热轧工艺及奥氏体区热轧工艺对普通用冷轧钢板(SPCC)产品热轧组织、冷轧组织及性能的影响。结果表明,与奥氏体区轧制工艺相比,采用铁素体区热轧工艺生产的SPCC热轧板晶粒尺寸会增大约17 μm,{111}面织构数量减少了8.74%,强度略微降低,而{001}<110>织构数量增加了12.40%,强度提高了19.81。此外,采用铁素体区热轧工艺生产的SPCC成品晶粒呈近似等轴状,与奥氏体区热轧工艺相比平均晶粒尺寸增大了4.5 μm。SPCC铁素体区轧制热轧板中更大的晶粒尺寸、更少的{111}面织构及更强的{001}<110>取向织构导致了冷轧成品更低的屈服强度和塑性应变比r值,较奥氏体区热轧工艺而言平均屈服强度降低了19 MPa,平均r值下降了1.1。

Effect of ferrite rolling on microstructure and properties of steel plate cold-rolled common

Effects of ferrite hot rolling process and austenite hot rolling process on hot rolled microstructure, cold rolled microstructure and properties of steel plate cold-rolled common(SPCC) were studied by optical microscope and scanning electron microscope. The results show that compared with austenite rolling process, the average grain size of the hot rolled band produced by ferrite hot rolling process increases about 17 μm, the amount of {111} texture decreases by 8.74%, and the intensity of {111} texture decreases slightly, while the amount and intensity of {001}<110> texture increases by 12.40% and 19.81, respectively. In the SPCC product produced by ferrite hot rolling process, the grains are approximately equiaxed, and compared with that produced by austenile hot raling process, it is also found that the average grain size is about 4.5 μm larger, the average yield strength is 19 MPa lower, and the average r value(plastic strain ratio) is 1.1 smaller. The lower yield strength and r value are due to the larger grain size, less {111} texture and stronger {001}<110> texture in the hot rolled band produced by ferrite hot rolling process.