Abstract：Microstructural features of two oxide dispersion strengthened(ODS)ferritic steels by mechanical alloying using pure metal powders and nitrogen atomized powder as raw materials respectively were investigated.Microstructure analysis by SEM and X-ray diffraction,laser diffraction/scattering particle size distribution analyzer,and chemical analysis were used to compare the mechanical alloying effects between these two starting materials.The results show that the alloying elements distribute more homogeneous employing the nitrogen atomized powder as raw materials than that of using pure metal powders.Furthermore,mechanical alloying under high purified Ar atmosphere can better reduce the excess oxygen content than that of under vacuum mechanical alloying.
KAITO T,UKAI S,OHTSUKA S,et al.Development of ODS Ferritic Steel Cladding for the Advanced Fast Reactor Fuels[C].Tsukuba:Proceedings of GLOBAL 2005,2005.196. MUKHOPADHYAY D K,FROES F H,GELLES D S.Development of oxide dispersion strengthened ferritic steels for fusion[J].Journal of Nuclear Materials,1998,258-263(Part 2):1209-1215. CHO H S,KIMURA A,UKAI S,et al.Corrosion properties of oxide dispersion strengthened steels in super-critical water environment[J].Journal of Nuclear Materials,2004,329-333(Part 1):387-391. CHO H S,KIMURA A.Corrosion resistance of high-Cr oxide dispersion strengthened ferritic steels in super-critical pressurized water[J].Journal of Nuclear Materials,2007,367-370(Part 2):1180-1184. OHTSUKA S,UKAI S,FUJIWARA M,et al.Nano-structure control in ODS martensitic steels by means of selecting titanium and oxygen contents[J].Journal of Physics and Chemistry of Solids,2005,66(2-4):571-575. RAMAR A,OKSIUTA Z,BALUC N,et al.Effect of mechanical alloying on the mechanical and microstructural properties of ODS EUROFER 97[J].Fusion Engineering and Design,2007,82(15-24):2543-2549. IWATA N Y,KIMURA A,FUJIWARA M,et al.Effect of milling on morphological and microstructural properties of powder particles for high-Cr oxide dispersion strengthened ferritic steels[J].Journal of Nuclear Materials,2007,367-370(Part 1):191-195. 汤春峰,曲选辉,周霆,等.机械合金化ODS钴基合金粉末的放电等离子烧结[J].稀有金属材料与工程,2007,36(8):1461-1464. 关璐,曲选辉,贾成厂,等.用机械合金化法制备含氮不锈钢粉末[J].北京科技大学学报,2005,(6):692-694. KLIMIANKOU M,LINDAU R,MOESLANG A.Energy-filtered TEM imaging and EELS study of ODS particles and argon-filled cavities in ferritic-martensitic steels[J].Micron,2005,36(1):1-8.