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

被引：2
|
作者：
Kowalska-Mori, A. [1 ,2 ]
Mamiya, H. [1 ]
Ohnuma, M. [3 ]
Ilaysky, J. [4 ]
Gilbert, E. P. [5 ]
Bazarnik, P. [2 ]
Kitazawa, H. [1 ]
Lewandowska, M. [2 ]
机构：
[1] NIMS, 1-2-1 Sengen, Tsukuba, Ibaraki 3050047, Japan
[2] WUT, Fac Mat Sci & Engn, Woloska 141, PL-02507 Warsaw, Poland
[3] Hokkaido Univ, Fac Engn, Kita Ku, Kita 13,Nishi 8, Sapporo, Hokkaido 0608628, Japan
[4] Argonne Natl Lab, Adv Photon Source, Xray Sci Div, 9700 S Cass Ave,Bldg 433A002, Argonne, IL 60439 USA
[5] ANSTO, Australian Ctr Neutron Scattering, New Illawarra Rd, Lucas Heights, NSW 2234, Australia
来源：
MATERIALS CHARACTERIZATION | 2019年 / 153卷
关键词：
ODS austenitic steel; Nanoparticle; Small-angle neutron scattering (SANS); Ultra-small-angle X-ray scattering (USAXS); Alloy contrast variation (ACV); STRUCTURAL-MATERIALS; OXIDE PARTICLES; DISPERSION; TEMPERATURE; PRECIPITATION; STABILITY;
D O I：
10.1016/j.matchar.2019.05.008
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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 degrees 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.
引用
收藏
页码：339 / 347
页数：9
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