论文部分内容阅读
以酒钢CSP工艺DC04冷轧汽车板为原料,通过实验室模拟退火工艺,采用OM、EBSD、ODF技术,研究退火工艺对其组织和织构特征的影响。结果表明,DC04汽车板退火组织为铁素体和少量渗碳体,575℃退火1h再结晶开始,730℃退火1h后再结晶较为充分,并随着退火时间的延长,铁素体晶粒长大。不同压下率的DC04冷轧板和退火板中,主要织构均为bcc金属中典型的α(<110>//RD)纤维织构和γ(<111>//ND)纤维织构。随着压下率增加,{111}<112>织构的取向密度明显大于{111}<110>织构的取向密度。730℃退火后,低压下率67%的退火板织构中有微弱的{001}<110>取向,但随着压下率增大,这种织构逐渐消失,而形成较强的{111}<112>、{111}<110>有利织构。增加变形量有利于获得有利的{111}织构而抑制不利{001}织构的生成,从而提高DC04的深冲性能。
The cold rolled automobile board of CSP C04 was used as raw material. The effects of annealing process on the microstructure and textural properties were studied by laboratory simulated annealing process and OM, EBSD and ODF techniques. The results show that the microstructure of DC04 car sheet is ferrite and small amount of cementite. The recrystallization begins at 575 ℃ for 1h and recrystallizes after annealing at 730 ℃ for 1h. With the increase of annealing time, the grain size of ferrite Big. The main textures of DC04 cold-rolled sheets and annealed sheets with different reduction rates are all typical α (<110> // RD) and γ (<111> // ND) fiber textures in bcc metal. As the reduction rate increases, the orientation density of {111} <112> texture is significantly larger than the orientation density of {111} <110> texture. After annealed at 730 ℃, the texture of annealed sheet with a low pressure of 67% has a weak {001} <110> orientation. However, with the decrease of the rolling rate, the texture gradually disappears and a strong {111 } <112>, {111} <110> favorable texture. Increasing the amount of deformation is beneficial to obtaining the favorable {111} texture and inhibiting the formation of unfavorable {001} texture, thereby improving the deep drawability of DC04.