Influence of Reducing Gases on the Reduction Behavior of Water-Atomized Fe-Cr-Mo Powder

다국어 초록 (Multilingual Abstract)

In this study, Fe-based powder of composition Fe-3 wt% Cr-0.5 wt% Mo was prepared using a water atomizationprocess. After atomization, the total oxide content of the powder was calculated as ca. 2.09 wt%. Gasreduction of the as-atomized powder using CO, CH4, and H2 gases was carried out in a horizontal vacuum tubetypefurnace at 900 °C. Thermodynamic and kinetic calculations for the reduction reactions were carriedout using FactSage and HSC Chemistry programs. The results showed that the reduction proceeded in twostages: from Fe3O4 to FeO, and finally to Fe. Each reducing gas was evaluated and compared based on theoxide reduction capability. The lowest oxygen content was achieved for CH4 (0.49 wt%). However, with CH4,cementite (Fe3C) was also detected due to cracking of CH4.

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