Effect of prestrain and baking on the secondary deformation properties of cold-rolled ultra-high-strength steel sheets  

作　　者：XUE Peng ZHU Xiaodong LI Wei 

机构地区：[1]State Key Laboratory of Metal Matrix Composites,School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghrt 200240,China [2]Research Institute,Baoshan Iron&Steel Co.,Ltd.,Shanghai 201999,China [3]State Key Laboratory of Development and Application Technology of Automotive Steels(Baosteel),Shanghai 201999,China

出　　处：《Baosteel Technical Research》2020年第2期35-41,共7页宝钢技术研究（英文版）

摘　　要：Two experimental steels with tensile strength above 980 MPa were prepared to investigate the effect of prestrain and baking on their mechanical and fracture behaviors. The experimental results reveal that,for both experimental steels,with increases in the prestrain level,the bake hardening value increases before reaching a maximum point,and then decreases with further increases in the prestrain level. The results of a "bending-baking-secondary bending"test indicate that the secondary bendability deteriorates at a high level of prestrain. The yield strength of the experimental steels was found to increase and the elongation to decrease after high levels of prestrain and bake hardening. Fracture morphology images indicate that a high prestrain level is associated with shallow dimples and more and larger local cleavage areas.

关 键 词：ultra-high-strength steel bake hardening PRESTRAIN 

分 类 号：TG142.1[一般工业技术—材料科学与工程]