对80%冷轧形变量的IF钢板进行不同温度和保温时间的再结晶退火处理, 观测了晶粒长大过程中, 小晶粒、中等晶粒和大晶粒集合的平均晶粒尺寸和织构演变. 结果表明: 退火温度显著影响晶粒长大速率和3种尺寸晶粒的织构特征; 但在相同温度不同保温时间退火时, 3种尺寸晶粒织构类型相似, 仅强度随保温时间延长而增强, 且不同尺寸晶粒集合的织构和其平均晶粒尺寸间的关系可由经验公式近似描述.

Interstitial free (IF) steel sheet has been widely used in automotive industry for its excellent deep drawabilities, which are most strongly influenced by textures formed after annealing. It is well known that the conventional annealing texture of IF steel consists of partial $\alpha$ fiber texture (<110>//rolling direction, RD) and γ fiber texture (<111>//normal direction, ND) which benefits the deep drawabilities, i.e., the stronger the development of the γ fiber texture parallel to the sheet plane, the better the deep drawabilities. Recently, many results showed that the grain size distribution in IF steel during the grain growth has apparent influence on the properties, whereas the impact of the grain size distribution on the texture has not been well discussed. The present work uses EBSD to investigate the grain size and textures of small, medium and large grains of IF steel sample, which was cold rolled to a reduction of 80% and subsequently annealed at 710 and 770 ℃ for various hold times. The results showed that the impact of the annealing temperature is more important for the growth rate and texture characteristics of grain than the hold time, which means the growth rate and texture characteristics are entirely distinct at different annealing temperature. At the same annealing temperature, the textures of different groups of grain are similar at different hold times whereas its intensity increased with the duration. In different groups of grain, the relationships between the texture and the average grain size can be described by the empirical formula from the experiment data.