Characterization of 14YWT As-Atomized, Milled, Milled and Annealed Powders and HIP Consolidated Alloys
作者： Nicholas J. Cunningham , Auriane Etienne , G. Robert Odette , Erich Stergar , Yuan Wu
DOI: 10.1557/OPL.2011.392
关键词: Ball mill 、 Precipitation (chemistry) 、 Transmission electron microscopy 、 Metallurgy 、 Atom probe 、 Materials science 、 Electron microprobe 、 Annealing (metallurgy) 、 Particle-size distribution 、 Dispersion (chemistry)
摘要: Nanostructured ferritic alloys (NFA) are Fe-Cr based stainless steels containing an ultrahigh density of very stable Y-Ti-O nanofeatures (NFs) that provide dispersion strengthening and radiation damage resistance for candidate Generation IV future fusion reactor materials. This work is a small focused part larger collaboration to produce large best practice NFA heats. The powders analyzed were rapidly solidified from melt Fe-14%Cr, 3%W, 0.4%Ti 0.2%Y by gas atomization in Ar, Ar/O, He atmospheres. Note this represents different processing path conventional production where metallic mechanically alloyed with Y2O3 ball milling. Electron probe microanalysis (EPMA), atom tomography (APT), transmission electron microscopy (TEM) angle neutron scattering (SANS) used characterize the as-atomized, milled annealed conditions. EPMA showed Y heterogeneously distributed phase separated all as atomized powders, but attritor milling 20 40 h required mix Y. Milling also creates significant quantity O well N contamination. Subsequent powder annealing treatments, typically at 1150°C, result precipitation high NFs. All variants show bimodal grain size distribution, TEM APT NFs both grains. Reducing content added during Ar increased precipitate decreased number density, adversely affecting hardness.
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