中文摘要：

微波加热内配碳酸钙高碳铬铁粉可实现高碳铬铁粉快速固相脱碳,获得含CaO的中低碳铬铁粉.选取微波加热900,1000,1100,1200℃,并分别保温脱碳60min的系统样品,在测定其铬铁粉碳含量的基础上,采用金相、电子探针显微镜及XRD对比分析,研究了固相脱碳过程中铬铁粉的碳含量与物相之间关系.结果表明,微波加热温度从900℃提高到1200℃,样品中高碳铬铁粉的碳含量可由8.16%分别降至5.06%,2.24%,1.71%,1.39%,其相变由富碳碳化物相（Cr,Fe）7C3逐步向富金属碳化物相（Cr,Fe）23C6、铬铁素体相CrFe变化;金相组织结构由（Cr,Fe）7C3粗晶粒状结构向（Cr,Fe）23C6蜂窝状溶蚀、CrFe粒状蚕食结构转变,脱碳物料中的铬氧化物主要有Cr2O3,CaCr2O4和CaCr2O7.综合考虑,最佳固相脱碳工艺条件为1100℃保温60min.

英文摘要：

Medium and low-carbon ferrochrome powder containing CaO was obtained by fast solid-phase decarburization of high-carbon ferrochrome powder with CaCO3 by microwave heating. High-carbon ferrochrome powder with calcium carbonate was decarburized at 900, 1000, 1 100, 1200℃ for 60 min. The carbon content of decarburized material was measured. The microstructure and phase composition of this new metallurgical material were studied by metallography, electron probe and XRD phase analyzers, the carbon content and phases change during the solid-phase decarburization were also analyzed. The results show that carbon content of high-carbon ferrochrome powder was 5.06%, 2.24%, 1.71% and 1.39% at 900, 1000, 1100 and 1200 ℃. Compared with original carbon content of 8.16%, it was obviously reduced during the decarburization, carbon-rich carbide phase （Cr, Fe）TC3 changed gradually to metal-rich carbide phase （Cr, Fe）23C6 and ferrochrome ferrite phase CrFe; Coarse grain structure （Cr, Fe）7C3 changed to honeycomb dissolution structure （Cr, Fe）23C6 and granular encroach structure CrFe. Chromium oxides in the decarburized material were mainly Cr203, CaCr204 and CaCr2OT. Generally, the optimum conditions of solid phase decarburization were decarburization temperature of 1 100 ℃ and 60 min heating.