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Kowalska-Mori, A.
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article
Effect of post annealing on microstructure and mechanical properties in Ni-free N-containing ODS steel
Abstract
The precipitation behavior of Y2O3 and MnO nanoparticles after isothermal treatment, in a Ni-free N-containingoxide dispersion strengthened (ODS) steel was studied by wide-angle X-ray scattering (WAXS), ultra-small-angleand small-angle X-ray scattering (USAXS/SAXS), small angle neutron scattering (SANS) and scanning transmissionelectron microscopy (STEM). Mechanical properties were investigated via tensile and micro-hardnesstesting. Additional precipitation occurred during annealing, in addition to the precipitates formed during sintering.The highest volume distribution of Y2O3, with average size of 6 nm, was determined by alloy contrastvariation (ACV) analysis of SAXS and SANS for the sample annealed at 800 °C; this sample shows the highesthardness and ultimate tensile strength. Above that temperature, coarsening of both matrix and precipitates anddepletion of nitrogen from matrix degraded the mechanical properties. The very fine nanoparticles and thermallyinduced dissolution of nitrogen influenced mechanical properties.