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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。
The oxide dispersion strengthening (ODS) iron-based alloy was prepared by chemical liquid phase method combined with spark plasma sintering (SPS). The alloy was cold rolled at 40% and 70% deformation temperature and then kept at 900-1200 ℃ for 60-150 min Annealing heat treatment, followed by cooling to room temperature with the furnace. The microstructure and recrystallization behavior of the alloy were observed and analyzed by field emission scanning electron microscope (FE-SEM) and hardness tester. The results show that the microstructure of (ODS) iron-based alloy prepared by chemical liquid-phase method is uniform and fine with an average grain size of about 10μm. The nano-sized dispersed phase particles are uniformly distributed in the matrix with an average diameter of 20 nm and the particle spacing is 50 ~ 200 nm. The initial recombination temperature was over 900 ℃ and the recrystallization temperature was between 1000 and 1100 ℃. The grain size uniformity of the high-strain (70%) alloy was better after being maintained at 1200 ℃ and 150 min.