化学液相法制备氧化物弥散强化(ODS)铁基合金的组织与再结晶

Microstructure characteristic and recrystallization of oxide dispersion strengthened(ODS) iron based materials prepared by chemical liquid phase method

采用化学液相法结合放电等离子烧结技术(SPS)制备氧化物弥散强化(ODS)铁基合金,将合金经过40%和70%变形量冷轧变形之后在900~1200℃进行保温60~150 min退火热处理,之后随炉冷却至室温。通过场发射扫描电镜(FE-SEM)和硬度仪观察并分析了合金的微观组织和再结晶行为。结果表明,采用化学液相法制备的(ODS)铁基合金微观组织均匀细小,平均晶粒度约10μm,纳米级的弥散相粒子均匀分布于基体中,其平均直径为20 nm,粒子间距为50~200 nm;开始再结温度超过900℃,再结晶温度在1000~1100℃之间;高形变量(70%)合金在1200℃及150 min保温后,晶粒尺寸均匀稳定性较好。

Oxide dispersion strengthened( ODS) iron-based alloys were prepared by chemical liquid phase method conbined with spark plasma sintering( SPS). The alloys were deformed by 40% and 70% and then annealed at 900-1200 ℃ for 60-150 min,and furnace cooling to room temperature. Microstructure and recrystallization behavior of the alloys were studied by means of field emission scanning electron microscope( FE-SEM) and hardness test. The results show that the microstructure of the alloy prepared by chemical liquid phase method is uniformly and fine,with an average grain size of about 10 μm,and the dispersed nano-phase particles are uniformly distributed in the matrix with an average diameter of 20 nm,particle spacing is 50-200 nm. The start temperature of recrystallization of the alloy exceeds 900 ℃,and the recrystallization temperature range is between 1000-1100 ℃. The grain size uniform stability of the alloy with deformation of 70% after annealing at 1200 ℃ for 150 min is good.