论文部分内容阅读
Nanocrystalline oxide dispersion strengthened (ODS) ferritic steel powders with nominal composition of Fe-14Cr-3W-0.3Ti-0.4Y2O3 are synthesized using sol-gel method and hy-drogen reduction.At low reduction temperature the impurity phase of CrO is detected.At higher reduction temperature the impurity phase is Cr2O3 which eventually disappears with increasing reduction time.A pure ODS ferritic steel phase is obtained after reducing the sol-gel resultant products at 1200℃ for 3h.The HRTEM and EDS mapping indicate that the Y2O3 particles with a size of about 15nm are homogenously dispersed in the alloy matrix.The bulk ODS ferritic steel samples prepared from such powders exhibit good mechanical performance with an ultimate tensile stress of 960 MPa.
Nanocrystalline oxide dispersion strengthened (ODS) ferritic steel powders with nominal composition of Fe-14Cr-3W-0.3Ti-0.4Y2O3 were synthesized using sol-gel method and hy-drogen reduction. At low reduction temperature the impurity phase of CrO is detected. At higher reduction temperature the impurity phase is Cr2O3 which eventually disappears with increasing reduction time. A pure ODS ferritic steel phase is obtained after reducing the sol-gel resultant products at 1200 ℃ for 3h. HRTEM and EDS mapping indicate that the Y2O3 particles with a size of about 15 nm are homogenously dispersed in the alloy matrix. The bulk ODS ferritic steel samples were prepared from such powders exhibit good mechanical performance with an ultimate tensile stress of 960 MPa.