双辊铸轧Cr12钢的热处理工艺对深冲性和抗皱性的影响

将双辊铸轧Cr12钢薄板于1 000℃固溶,再采用炉冷和水淬两种方式冷却至室温,分别获得了多边形铁素体和板条马氏体两种组织,再经过相同冷轧和退火工艺,得到了两种成品板.经拉伸试验测定,水淬板的深冲性和抗皱性均强于炉冷板.组织分析发现:热处理后,水淬板内马氏体板块明显细小于炉冷板内铁素体晶粒;冷轧后,水淬板内板块间界演变...

Effect of Thermal Treatment on Deep Drawability and Ridging Resistance of Twin-Roll Strip Casting Cr12 Steel Sheet

Twin roll strip casting Cr12 steel sheets were solution treated at 1000℃ and then furnace cooled (FC) and water quenched (WQ) to room temperature in two ways, to obtain polygonal ferrite and lath martensite respectively. After the same cold rolling and annealing processes, two kinds of product sheets were obtained. Detected by tensile experiment, WQ sheet exhibited stronger deep drawability and ridging resistance than FC sheet. Microstructural analysis found that the martensitic packets in WQ sheet were obviously finer than ferrite grains in FC sheet after thermal treatment. The packet boundaries transformed into high density grain boundaries after cold rolling. That increased nucleation density, refined recrystallized microstructure and suppressed the occurrence of grain colonies during annealing. So WQ sheet expressed weaker ridges than FC sheet. Textural analysis found that because of higher plastic deformation ability of the matrix, WQ sheet obtained stronger α fiber texture with peak orientation closer to {111}<110> after cold rolling and further obtained stronger and more homogeneous γ fiber texture after annealing than FC sheet. A Goss texture also formed in FC sheet. So WQ sheet expressed higher rm value and lower Δr value than FC sheet.