| At first, nuclear fusion and ITER program were introduced in the paper. Then,Focused on the existing form and oxide strengthening mechanism of oxide in RAFMsteel, The First Wall materials and RAFM steel were systematically presented; finally,the research content and technology route were put forward.The exploration and preparation of Fe-Si-Y2O3solid solution powder were studiedin the paper. Fe-3Si-10.7Y2O3composition was selected as research object. Consideringthe effect on powder at different milling time, it was found that the degree of mechanicalalloying was relatively higher after48hour. When the powder annealed at1000℃,compared to the powder before annealing, the results show that the main peak of Fe wasshifted, accompanied with smaller particle size and spheroidal particle. The annealedpowder was inlaid in phenolic resin, revealed the content of Si and Y elements were veryhigh in particles sectional, there may be speculated that the precipitates were rich in Siand Y elements.In this paper, the preparation and properties of Fe-Cr-W-Si-Y2O3alloys were alsostudied. Work on the precipitated phase of2%Y2O3contented alloy, found that the size ofnano-precipitates was less than10nm. The size distribution of precipitated phases wassummarized. Considering the effect on relativity density and microhardness of alloys atdifferent sintering temperature and Si content, found that the relativity density andmicroharness of0.5%Si contented alloy were97.6and278.3HV at1370℃. Work on themicrostructure of alloy by EDS analysis, revealed that the precipitated phases were richin Si and Y elements. The effect on the tensile strength and elongation at differenttemperature and Si content were studied, found that the tensile strength and elongation of0.5%Si contented alloy were545.7MPa and23.6%. After analysis of the fracture surfaceof Fe-Cr-W-Si-Y2O3alloy, dimple size of the content of0.5%Si alloys were smaller anddeeper at1370℃. The second phase precipitates of fracture were spheroidal and had uniform distribution. |
