Oxides formation mechanism of oxide dispersion strengthened12Cr steel by complex sol gel method
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摘要: 以乙二胺四乙酸(EDTA)为络合剂, 采用EDTA络合溶胶-凝胶法向氩气雾化制备的预合金粉末中添加Y2O3, 复合粉通过热等静压致密化, 锻造后固溶处理, 制得化学成分为Fe-12Cr-2.5W-0.25Ti-0.2V-0.4Y2O3 (0.4Y2O3/12Cr, 质量分数, %)的氧化物弥散强化(ODS) 铁素体钢(12Cr)。采用SEM、FE-SEM、XRD对复合粉末、热等静压态和锻造态Y2O3/12Cr铁素体钢中的氧化物的形成过程和行为进行了分析和表征。结果表明: 化学法制备的Y2O3弥散强化0.4Y2O3/12Cr铁素体钢中氧化物的形成机制有络合热分解机制、界面反应机制和再析出机制。通过选择合适的工艺参数和机械分散作用可获得细小均匀的氧化物强化相。Abstract: An oxide dispersion strengthened(ODS) ferritic steel with nominal composition of Fe-12Cr-2.5W-0.25Ti-0.2V-0.4Y2O3 (0.4Y2O3/12Cr, mass fraction, %) was produced by using ethylene diamine tetraacetic acid(EDTA) complex method to add Y2O3 particles to an argon atomized steel powder, followed by hot isostatic pressing, forging and heat treatment. The formation process and behavior of oxides in the composite powder, the 0.4Y2O3/12Cr steels in hot isostatic pressing and under forged conditions were characterized by using SEM, FE-SEM and XRD. The results show that the oxides formation mechanisms of 0.4 Y2O3/12Cr steel by EDTA complex method are complex thermal decomposition mechanism, interfacial reaction mechanism, and reprecipitation mechanism. The fine and uniform oxide dispersoids distributtion in the ferrite matrix could be obtained by choosing appropriate parameters and mechanical dispersing effect.
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