Characterization of Surface Oxides on Water-Atomized FeMn Powder before and after Reduction

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• 作者：LI Song-linLONG An-pingWANG HangCHEN Hui-zhu
• 会议时间：2013-11-01
• 关键词：FeMn pre-alloyed steel powder ; water atomization ; XPS analysis ; surface oxide ; high temperature reduction
• 作者单位：State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,P.R.China
• 母体文献：2013年全国粉末冶金学术会议及海峡两岸粉末冶金技术研讨会论文集
• 会议名称：2013年全国粉末冶金学术会议及海峡两岸粉末冶金技术研讨会
• 会议地点：厦门
• 主办单位：中国机械工程学会
• 语种：chi

摘要

Unreduced low-alloy steel powder containing manganese (≈ 0.3wt.%) were prepared by water atomization,while reduced FeMn pre-alloyed steel powder were obtained after reduction at 970oC in H2 for 2h.The composition,morphology,existing form,distribution of oxides and their evolution during high temperature reduction were analyzed by x-ray diffraction (XRD),scanning electron microscope (SEM) combined with energy disperse spectroscopy (EDS) and x-ray photoelectron spectroscopy (XPS).The results show that oxides exist in the forms of γ-Fe2O3,FeO,Mn2O3 and MnO in the unreduced and reduced FeMn powder.In the unreduced powder,γ-Fe2O3 exist in the 40nm outmost layer,while its thickness drops to lower than 10nm after reduction;Mn2O3 exists at any depth of the powder;MnO exists under more than 20nm beneath the surface of the powder.Most oxygen (96.5wt.%) can be reduced after high temperature reduction,with some complex oxides (Fe2O3,Mn2O3)remaining,and the thickness of oxygen-rich layer decreases to 1/22.5 of the original.