横向预拉伸对17%Cr超纯铁素体不锈钢表面抗皱性的影响

以17%Cr超纯铁素体不锈钢的冷轧退火板为原料，研究了3%、6%、9%和12%横向预拉伸(即拉伸方向垂直于板材轧向)变形对其冲压成形表面抗皱性的影响。采用电子背散射衍射技术及X射线衍射技术探究了横向预拉伸前后板材内部织构取向和晶粒团簇的演变规律。结果表明，横向预拉伸9%后实验钢板表面抗皱性获得较大提高。由于在退火、横向预拉及纵向拉伸后{001}取向晶粒含量均非常少，因此基于厚向塑性应变比差异的Chao起皱机理不适用实验钢，而基于平面剪切应变的Takechi模型能较好地解释实验结果。在横向预拉伸后，由于γ纤维织构晶粒簇的宽度降低、方向整体偏转，使得板材抗皱性得到提高。

Effect of transverse pre-stretching before deep drawing on the surface ridging resistance of 17%Cr ultra-purified ferritic stainless steel

Cup-drawing test was performed to study the effect of transverse pre-stretching, namely 3%, 6%, 9% and 12%deformation, on the surface ridging resistance during deep drawing of a 17% Cr ultra-purified ferritic stainless steel cold-rolled annealed sheet. The evolution of textures and grain clusters in the tested sheet after transverse pre-stretching was analyzed by electron back-scatter diffraction and X-ray diffraction. It is found that the ridging resistance apparently improves after the 9% transverse pre-stretching. Because the content of{001} orientation grains is not enough to meet the requirement of the Chao ridging model, this model is not suitable for ridging of the tested sheet. However, the Takechi model, which is called an out-of-plane shearing strain model, is considered to be suitable for ridging of the tested sheet. It is concluded that the narrow of the width ofγ-fiber texture clusters and the deflection of grain clusters to the rolling direction are the major causes of improving the ridging resistance.