Abstract Oxidation diagram of the Fe-Mn-Cr-O system was determined using Scanning Electron Microscopy equipped with Energy Dispersive X-ray Spectrometer and X-ray power diffraction. The 1000 °C isothermal section of the Fe-Mn-Cr-O system was investigated experimentally. The oxide phases, Spinel, Monoxide and Corundum can equilibrate with the Fe-Mn-Cr alloys. Two three-phase equilibrium regions (two oxide phases coexist with alloy phase), Corundum + Spinel + Bcc and Monoxide + Spinel + Fcc, have been detected. The oxide phase boundary of Spinel and Monoxide was obtained. Thermodynamic computations of the Fe-Mn-Cr-O oxidation diagram at 1000 °C and 800 °C were performed. In comparison with the calculated phase diagram, the experimental oxide phase boundary of Spinel and Monoxide turns towards the Fe-Cr side partially. The phase diagram can be used to predict the oxidation of high-strength steel.

中文翻译：

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Fe-Mn-Cr-O体系相平衡的热力学分析与实验研究

摘要 Fe-Mn-Cr-O 体系的氧化图是使用配备能量色散 X 射线光谱仪和 X 射线功率衍射仪的扫描电子显微镜确定的。实验研究了 Fe-Mn-Cr-O 系统的 1000 °C 等温截面。氧化物相、尖晶石、一氧化物和刚玉可以与 Fe-Mn-Cr 合金平衡。已检测到两个三相平衡区（两个氧化物相与合金相共存），刚玉+尖晶石+ Bcc 和一氧化碳+尖晶石+ Fcc。获得了尖晶石和一氧化物的氧化物相界。进行了 1000 °C 和 800 °C 下 Fe-Mn-Cr-O 氧化图的热力学计算。与计算的相图相比，尖晶石和一氧化碳的实验氧化物相界部分转向铁铬侧。