精轧温度对含铌Cr17铁素体不锈钢组织、织构及成形性的影响

Influence of Finish-Rolling Temperature on Microstructure,Texture and Formability in Nb Microalloyed Cr17 Ferritic Stainless Steel

以铌稳定化的Cr17铁素体不锈钢为试验材料,系统研究了精轧温度,即高温精轧和低温精轧,对组织、织构和成形性能的影响。2种不同工艺的热轧板经相同的热带退火、冷轧及退火处理后,分别采用金相显微镜及X射线衍射技术观察2种工艺条件下的组织和织构演变。研究结果表明:与高温精轧相比,低温精轧有利于得到细小及均匀的冷轧退火组织;有利于冷轧退火板形成较强的γ纤维再结晶织构,并消除γ纤维再结晶织构的偏转。因此,低温精轧能够显著提高冷轧退火板的成形性能。

The influence of finish-rolling temperature on microstructure,texture and formability in micro-alloyed ultra purified ferritic stainless steels micro-alloyed with Nb was investigated,in which high and low finish-rolling temperatures were compared.After hot rolling,the steels were annealed,cold rolled and annealed in the same processes.The microstructure was observed by optical microscopy.The texture was measured by using an X-ray diffractometer.The results show that：the sheet with low temperature finish rolling has much finer grain,more homogenous microstructure than that with high temperature finish rolling;low temperature finish rolling was beneficial to strengthening the γ-fiber recrystallization texture of final sheets and eliminating its deviation from the exact 111 fiber axis.Therefore,the final sheets with low temperature finish rolling displayed an enhanced formability.