冷轧变形率对超纯铁素体不锈钢Cr22Mo织构和成形性能的影响

试验研究的Cr22Mo钢(/%:0.005C,0.40Si,0.20Mn,0.020P,0.010S,22.0Cr,1.0Mo,0.41Cu,0.14Nb,0.19Ti,0.0120N)经90 t BOF-VOD-LF-200 mm板坯连铸-热轧成5.0 mm板-退火并冷轧成1.5～0.5 mm板,冷轧变形率为70%～90%,冷轧板经1000℃退火。利用光学显微镜、X-射线衍射仪(XRD)和万能拉伸试验机研究了冷轧变形率对Cr22Mo钢组织、织构和力学性能的影响。结果显示,随着冷轧变形率的增大,冷轧和冷轧退火板的组织细化,再结晶织构{111}<112>强度增加,平均塑性应变比(r)值增加,平面各向异性△r值降低,冷轧压下率的增大显著改善了Cr22Mo钢冷轧退火薄板的成形性能。

Effect of Cold Rolling Reduction on Texture and Formability of Ultra-Clean Ferrite Stainless Steel Cr22Mo

The tested and studied steel Cr22Mo (/% ： 0.005C, 0.40Si, 0.20Mn, 0.020P, 0.010S, 22.0Cr, 1.0Mo, 0.41 Cu, 0. 14Nb, 0.19Ti, 0.012 0N) is produced by 90 t BOF-VOD-LF-200 mm slab casting-hot rolling to 5.0 mm plate-annealing and cold rolling to 1.5 ~ 0.5 mm sheet with cold rolling reduction 70% ~ 90% , and the cold-rolled sheet is annealed at 1 000 °C. The effect of cold rolling reduction on structure, texture and mechanical properties of steel Cr22Mo is studied by optical microscope, X-ray diffractometer (XRD) and universal tensile testing machine. The results show that with increasing cold rolling reduction the structure of cold-rolled and cold-rolled-annealed sheet is finer, the intensity of recrystallized texture {111}increases, average plastic strain ratio r value increases and the plane anisotropy △r decreases, and the increase of cold rolling reduction markedly improves the fbimability of cold-rolled annealed sheet of steel Cr22Mo.