摘要
利用连续退火试验机研究了连续退火工艺对电镀锡板组织和性能的影响。结果表明,在660～740℃退火温度范围内,随退火温度升高,晶粒尺寸逐渐增大,硬度降低。以24℃/s加热速率升温时,在达到700℃退火温度前,再结晶过程已基本完成,且退火5 s后,继续延长退火时间至45 s过程中晶粒长大速率减缓,硬度变化不明显。过时效处理对电镀锡板力学性能有较大影响。随过时效开始温度的变化,固溶强化和析出强化呈相互竞争关系。过时效开始温度由480℃降低到350℃过程中,钢板的硬度和强度呈现先减小后增大的趋势,伸长率在过时效开始温度为400℃时开始降低。纳米级的Fe3C伴随过时效开始温度的降低而大量析出,且弥散分布在铁素体基体内,对钢板的强度有较大影响。
Effects of continuous annealing process on microstructure and mechanical properties of electrolytic tinplate were investigated by continuous annealing experiment machine. The resuhs show that the grain size increases gradually and the hardness decreases as the annealing temperature increases from 660 ℃ to 740℃. At the heating rate of 24℃/s, recrystallization process nearly completes before reaching the annealing temperature 700 ℃. After 5 s annealing, the growth rate of grain size slows down and the hardness changes little as the annealing time extends to 45 s. The overaging process has significant effects on mechanical properties. As overaging temperature changes, solid solution strengthening and precipitation strengthening show competition relationship. Hardness and strength first decreases and then increases with the overaging temperature decreases from 480 to 350 ℃, and the elongation begin to decrease when the overaging temperature drops to 400℃. Nanometer-sized Fe3C precipitates rapidly from ferrite grains as the overaging temperature decreases. These Fe3 C uniformly distributes and disperses within ferrite grains and affects the strength significantly.
出处
《金属热处理》
CAS
CSCD
北大核心
2013年第6期49-54,共6页
Heat Treatment of Metals
关键词
连续退火
电镀锡板
晶粒尺寸
力学性能
过时效
continuous annealing
electrolytic tinplate
grain size
mechanical properties
overaging
