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Title: Effect of post annealing on microstructure and mechanical properties in Ni-free N-containing ODS steel

Abstract

The precipitation behaviour of Y2O3 and MnO nanoparticles after isothermal treatment, in a Ni-free N-containing oxide dispersion strengthened (ODS) steel was studied by wide-angle X-ray scattering (WAXS), ultra-small-angle and small-angle X-ray scattering (USAXS/SAXS), small angle neutron scattering (SANS) and scanning transmission electron microscopy (STEM). Mechanical properties were investigated via tensile and micro-hardness testing. 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 contrast variation (ACV) analysis of SAXS and SANS for the sample annealed at 800 °C; this sample shows the highest hardness and ultimate tensile strength. Above that temperature, coarsening of both matrix and precipitates and depletion of nitrogen from matrix degraded the mechanical properties. The very fine nanoparticles and thermally induced dissolution of nitrogen influenced mechanical properties.

Authors:
; ; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Warsaw University of Technology (Politechnika Warszawska)
OSTI Identifier:
1548292
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Materials Characterization
Additional Journal Information:
Journal Volume: 153
Country of Publication:
United States
Language:
English
Subject:
ODS austenitic steel; alloy contrast variation (ACV); nanoparticle; small-angle neutron scattering (SANS); ultra-small-angle X-ray scattering (USAXS)

Citation Formats

Kowalska-Mori, A., Mamiya, H., Ohnuma, M., Ilavsky, J., Gilbert, E. P., Bazarnik, P., Kitazawa, H., and Lewandowska, M. Effect of post annealing on microstructure and mechanical properties in Ni-free N-containing ODS steel. United States: N. p., 2019. Web. doi:10.1016/j.matchar.2019.05.008.
Kowalska-Mori, A., Mamiya, H., Ohnuma, M., Ilavsky, J., Gilbert, E. P., Bazarnik, P., Kitazawa, H., & Lewandowska, M. Effect of post annealing on microstructure and mechanical properties in Ni-free N-containing ODS steel. United States. doi:10.1016/j.matchar.2019.05.008.
Kowalska-Mori, A., Mamiya, H., Ohnuma, M., Ilavsky, J., Gilbert, E. P., Bazarnik, P., Kitazawa, H., and Lewandowska, M. Mon . "Effect of post annealing on microstructure and mechanical properties in Ni-free N-containing ODS steel". United States. doi:10.1016/j.matchar.2019.05.008.
@article{osti_1548292,
title = {Effect of post annealing on microstructure and mechanical properties in Ni-free N-containing ODS steel},
author = {Kowalska-Mori, A. and Mamiya, H. and Ohnuma, M. and Ilavsky, J. and Gilbert, E. P. and Bazarnik, P. and Kitazawa, H. and Lewandowska, M.},
abstractNote = {The precipitation behaviour of Y2O3 and MnO nanoparticles after isothermal treatment, in a Ni-free N-containing oxide dispersion strengthened (ODS) steel was studied by wide-angle X-ray scattering (WAXS), ultra-small-angle and small-angle X-ray scattering (USAXS/SAXS), small angle neutron scattering (SANS) and scanning transmission electron microscopy (STEM). Mechanical properties were investigated via tensile and micro-hardness testing. 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 contrast variation (ACV) analysis of SAXS and SANS for the sample annealed at 800 °C; this sample shows the highest hardness and ultimate tensile strength. Above that temperature, coarsening of both matrix and precipitates and depletion of nitrogen from matrix degraded the mechanical properties. The very fine nanoparticles and thermally induced dissolution of nitrogen influenced mechanical properties.},
doi = {10.1016/j.matchar.2019.05.008},
journal = {Materials Characterization},
number = ,
volume = 153,
place = {United States},
year = {2019},
month = {7}
}