奥氏体化温度和保温时间对高强钢热冲压回弹的影响  

Effect of austenitizing temperature and holding time on hot stamping springback of high-strength steel

作　　者：贺孟强 于沪平[1] 杨才定[2] 胡俊[1] HE Meng-qiang;YU Hu-ping;YANG Cai-ding;HU Jun(Institute of Forming Technology and Equipment,Shanghai Jiao Tong University,Shanghai 200030,China;Central Research Institute,Baoshan Iron&Steel Co.,Ltd.,Shanghai 201900,China)

机构地区：[1]上海交通大学塑性成形技术与装备研究院,上海200030 [2]宝山钢铁股份有限公司中央研究院,上海201900

出　　处：《塑性工程学报》2022年第7期38-44,共7页Journal of Plasticity Engineering

摘　　要：对BS960E高强钢进行了热冲压成形及模内淬火实验。在奥氏体化温度为900℃,保温时间为12 min时,模内保压时间达到10 s时可获得相转变率为84.8%的马氏体组织。通过在不同的奥氏体化温度和保温时间下进行热冲压实验,研究了奥氏体化温度和保温时间对U形件回弹角和微观组织的影响规律。结果表明,随着奥氏体化温度的升高,回弹角呈现先增大随后减小为负回弹最后再趋近于0°的变化趋势。随着保温时间的增长,回弹角呈现先减小后增大的变化趋势。同时,结合淬火零件中相转变程度与回弹角的变化规律发现,奥氏体化温度和保温时间通过影响马氏体相变从而进一步影响回弹,回弹角绝对值会随着相转变程度的增大而增大。Hot stamping and in-die quenching experiments were carried out for BS960 E high-strength steel. When the austenitizing temperature is 900 ℃, and the holding time is 12 min, the martensite structure with phase transformation rate of 84.8% can be obtained with in-die holding time of 10 s. Through hot stamping experiments at different austenitizing temperatures and holding time, the effect law of the austenitizing temperature and holding time on springback angle and microstructure of U-shaped parts was studied. The results show that with the increase of austenitizing temperature, the springback angle presents a trend of increasing first, then decreasing to negative springback, and finally approaching 0°. As the holding time increases, springback angle presents a trend of decreasing first and then increasing. At the same time, combining with the phase transformation degree and the change law of springback angle in the quenched parts, it is found that the austenitizing temperature and holding time further affect springback by affecting the martensitic transformation, and the absolute value of springback angle increases with the increase of phase transformation degree.

关 键 词：热冲压 模内淬火 高强钢 回弹 

分 类 号：TG306[金属学及工艺—金属压力加工]