变形速度对TRIP钢冲压成形性的影响.pdfVIP

Vo l. 15 No.6 第 15 卷第6 期 扭除.s...税带根 Dec. 2008 2008 年 12 月 JOURNAL OF PLASTICITY ENGINEERING 变形速度对 TRIP 钢冲压成形性的影晌骨 (同济大学汽车学院，上海 200092) 余海燕 摘 要:在 TRIP 钢相变动力学模型的基础上，推导了确余奥氏体体积比变化速惑与变形速度的关系，详细分析了 变形模式和变形速度对战余奥氏体转变的影响规律，讨论了相变诱发组性被应对TRIP 钢冲压成形性的作用机理， 并通过圆筒件拉探成形试验，验证了不间变形速度下 TRIP 钢的成形性.结果表明，残余奥氏体体积比变化迷惑随 变形速度的增加而增加;变形速度和变形模式对相变诱发组性效应的发挥影响较大，变形过快导致盾镇变形所需 塑性补充不足; TRIP 钢良好剧性得以发挥，必须具有合适的变形条件。 关键调: TRIP 钢F 变形速度;体职比变化速率F 冲压成形性s 变形模式 中朋分提号: TG113 文献标i.R码 :A 文章编号: 1007-2012 (2008) 06-0025静04 Iofluence of deformation rate 00 formability of TRIP sheet steel YU Hai-yan (Sch∞1 of Auωmotive Engineering , Tongji University , Shanghai 200092 China) Abstract: on the basis of transformation dynamics mechanics model of TRIP steels. expression-describing relatíonship between transformation velocity of retained austenite and deformation rate is propos此 lnfluence of deformatíon mode and deformation rate on martensíte transformation is analyzed in detai l. And mechanism of transformation-induced plasticíty effect on formability for TRIP steels is discussed. Then e即eriments of cup deep drawn under different velocity areωηied out and formabílity is analyzed. It indicated that transformation rate increases with deformation rate and deformation rate is very important for TRIP effect to bring into play. Fast deformation ωuld result in plasticity supply falling short for further deformatíon. Only under appropriate deformation mode and suitable deformation rate could the good ductility be made full use of. Key wor由: TRIP steels; deformation rate; volume fraction changing rate; sheet metal formabilitYI deformation mode