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

A. Kowalska-Mori , H. Mamiya , M. Ohnuma , J. Ilavsky , E.P. Gilbert , Piotr Bazarnik , H. Kitazawa , Małgorzata Lewandowska

Abstract

The precipitation behavior 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.
Author A. Kowalska-Mori
A. Kowalska-Mori,,
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, H. Mamiya
H. Mamiya,,
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, M. Ohnuma - Hokkaido University
M. Ohnuma,,
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, J. Ilavsky
J. Ilavsky,,
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, E.P. Gilbert
E.P. Gilbert,,
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, Piotr Bazarnik (FMSE / DMD)
Piotr Bazarnik,,
- Division of Materials Design
, H. Kitazawa
H. Kitazawa,,
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, Małgorzata Lewandowska (FMSE / DMD)
Małgorzata Lewandowska,,
- Division of Materials Design
Journal seriesMaterials Characterization, ISSN 1044-5803, (A 45 pkt)
Issue year2019
Vol153
Pages339-347
Publication size in sheets0.5
Keywords in EnglishODS austenitic steel Nanoparticle Small-angle neutron scattering (SANS), Ultrasmall- angle X-ray scattering (USAXS) Alloy contrast variation (ACV)
ASJC Classification2210 Mechanical Engineering; 2211 Mechanics of Materials; 3104 Condensed Matter Physics; 2500 General Materials Science
DOIDOI:10.1016/j.matchar.2019.05.008
Languageen angielski
File
2019 Mat Charct Mori.pdf 3.27 MB
Score (nominal)45
ScoreMinisterial score = 45.0, 05-09-2019, ArticleFromJournal
Publication indicators Scopus SNIP (Source Normalised Impact per Paper): 2017 = 1.545; WoS Impact Factor: 2017 = 2.892 (2) - 2017=3.036 (5)
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