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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.
Microwave heating with calcium carbonated high-carbon ferrochrome powder can achieve high-speed solid-phase decarburization of high-carbon ferrochrome powder to obtain medium and low carbon ferrochrome containing CaO. Select microwave heating 900,1000,1100,1200 ℃, and were incubated After decoloration for 60min, the carbon content of ferrochrome powder was determined by metallographic examination, electron probe microscope and XRD. The results show that the carbon content of high carbon ferrochrome powder can be reduced from 8.16% to 5.06%, 2.24%, 1.71% and 1.39% respectively by microwave heating temperature from 900 ℃ to 1200 ℃, The carbide phase (Cr, Fe) 7C3 gradually changed into CrFe (Fe) 23C6 and CrFe phase. The microstructure of the microstructure changed from (Cr, Fe) 7C3 coarse grain structure to , Fe) 23C6 honeycomb corrosion, CrFe grainy encroachment structure change, the main chromium oxide in the decarburized material is Cr2O3, CaCr2O4 and CaCr2O7. Considering, the optimum solid state decarburization process conditions are 1100 ℃ 60min.