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《The Chinese Journal of Nonferrous Metals》 2010-05
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Effect of addition manner of oxygen on mechanical properties of iron-based alloy 14YWT

LIU Dong-hua,LIU Yong,ZHAO Da-peng,LIU Zu-ming,HAN Yun-juan(State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China)  
The effects of the oxygen addition manner on microstructures and mechanical properties of Fe-based alloy were investigated by oxygen analysis,X-ray diffractometry(XRD),scanning electron microscopy(SEM),energy spectrum analysis and microhardness test.The results show that the oxygen atom is incorporated into the alloy when the atomized droplet contacts with oxygen during the condensation process.The existing manner of oxygen in the atomized powders is solid solution.The oxygen dissolves uniformly in the oxidized powder and a very thin layer of oxides forms on the powder surface after sintering at 500 ℃ for 4 h.The solid solubility of oxygen in the iron-based powder increases after the mechanical alloying(MA).The oxygen as solid solute distributes evenly in the fractured atomized powders.The oxygen content increases at the grain boundary of the elongated grains composed by the unfractured MA powder.The precipitated phase preferentially forms at the grain boundary which strengthens the iron-based alloy with oxidized powder,therefore the microhardness increases.The oxygen content in the equaixed grain composed of fine particles is very low,and the microhardness of the alloy decreases.The oxygen of the MA atomized powder distributes evenly,and the microhardness of the iron-based alloy also distributes evenly.
【Fund】: 国家自然科学基金创新群体资助项目(50721003) 国家自然科学基金资助项目(50634060)
【CateGory Index】: TG131
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