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›› 2013, Vol. 13 ›› Issue (3): 415-423.

• 过程与工艺 • Previous Articles     Next Articles

Phase Structure of Decarburized Product from High-carbon Ferrochrome Powder Added with Calcium Carbonate by Microwave Heating

WANG Long CHEN Jin HAO Jiu-jiu LIN Wan-ming LI Kai DENG Yong-guang   

  1. College of Materials Science and Engineering, Taiyuan University of Technology College of Materials Science and Engineering, Taiyuan University of Technology College of Materials Science and Engineering, Taiyuan University of Technology College of Materials Science and Engineering, Taiyuan University of Technology CITIC Dameng Mining Industries Limited
  • Received:2013-06-17 Revised:1900-01-01 Online:2013-06-20 Published:2013-06-20
  • Contact: CHEN Jin

微波加热内配碳酸钙高碳铬粉脱碳物料的物相结构

王龙 陈津 郝赳赳 林万明 李凯 邓永光   

  1. 太原理工大学材料科学与工程学院 太原理工大学材料科学与工程学院 太原理工大学材料科学与工程学院 太原理工大学材料科学与工程学院 中信大锰矿业有限责任公司
  • 通讯作者: 陈津

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Abstract: 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, 1100, 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)7C3 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 Cr2O3, CaCr2O4 and CaCr2O7. Generally, the optimum conditions of solid phase decarburization were decarburization temperature of 1100℃ and 60 min heating.

Key words: microwave heating, high-carbon ferrochrome powder, calcium carbonate, solid-state decarburization, microstructure

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60 min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60 min.

关键词: 微波加热, 高碳铬铁粉, 碳酸钙, 固相脱碳, 显微结构

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