连续冷却过程中铜含量对析出的影响

Effect of Cu Content on Precipitation During Continuous Cooling

研究了一系列含铜钢在连续冷却过程中的析出行为。采用1℃/s的冷却速度以及中间淬火取样方法获得铁素体组织。利用金相显微镜和透射电镜研究不同铜含量对析出的影响。结果表明:当铜的质量分数高于1.5%时,随着铁素体的产生,在铁素体内产生第二相析出颗粒。当铜的质量分数低于1%时,并未观察到第二相析出。第二相析出物为富铜颗粒,以相间沉淀方式析出。

The precipitation behavior of Cu-bearing steels during continuous cooling was investigated.Microstructure of ferrite was obtained by using 1 ℃/s cooling rates and interrupted cooling.The optical microscope and TEM were used to study the effect of different Cu content on the precipitation process.The results show that when the steels was cooled at 1 ℃/s,the second-phase precipitates occurs in the steels which Cu content is higher than 1.5%.However there are no obvious precipitates in the steels which Cu content is lower than 1%.The second-phase precipitates are copper-rich particles in the way of phase precipitation.