Manufacturing and characterization of Ni-free N-containing ODS austenitic alloys

Journal Article · Wed Jan 17 00:00:00 EST 2018 · Journal of Nuclear Materials

DOI:https://doi.org/10.1016/j.jnucmat.2018.01.025· OSTI ID:1420074

Kowalska-Mori, A. ^[1]; Mamiya, H. ^[2]; Ohnuma, M. ^[3]; Ilavsky, Jan ^[4]; Ohishi, K. ^[5]; Wozniak, J. ^[6]; Olszyna, A. ^[6]; Watanabe, N. ^[2]; Suzuki, J. ^[5]; Kitazawa, H. ^[2]; Lewandowska, M. ^[6]

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1. National Inst. for Materials Science (NIMS), Tsukuba (Japan); Warsaw Univ. of Technology (WUT), Warsaw (Poland)
2. National Inst. for Materials Science (NIMS), Tsukuba (Japan)
3. Hokkaido Univ., Sapporo (Japan). Faculty of Engineering
4. Argonne National Lab. (ANL), Argonne, IL (United States). X-Ray Science Division
5. Neutron Science and Technology Center, Comprehensive Research Organization for Science and Society (CROSS), Tokai-mura, Naka-gun (Japan)
6. Warsaw Univ. of Technology (WUT), Warsaw (Poland)

Ni-free N-containing oxide dispersion strengthened (ODS) austenitic alloys were manufactured by mechanical alloying (MA) followed by spark plasma sintering (SPS). The phase evolutions during milling under a nitrogen atmosphere and after sintering were studied by X-ray diffraction (XRD). Transmission electron microcopy (TEM) and contrast variation analysis (ACV), including small-angle neutron scattering (SANS) and ultra-small X-ray scattering (USAXS), revealed the existence of nanoparticles with a diameter of 3-51 nm for the samples sintered at 950 ºC. Sintering at 1000 ºC for 5 and 15 min caused slight growth and a significant coarsening of the nanoparticles, up to 70 nm and 128 nm, respectively. The ACV analysis indicated the existence of two populations of Y2O3, ε-martensite and MnO. The dispersive X-ray spectrometry (EDS) confirmed two kinds of nanoparticles, Y2O3 and MnO. The material was characterized by superior micro-hardness, of above 500 HV0.1.

• Research Organization: Argonne National Lab. (ANL), Argonne, IL (United States)
• Sponsoring Organization: USDOE Office of Science - Office of Basic Energy Sciences - Scientific User Facilities Division; Warsaw University of Technology (Politechnika Warszawska)
• Grant/Contract Number: AC02-06CH11357
• OSTI ID: 1420074
• Journal Information: Journal of Nuclear Materials, Vol. 501; ISSN 0022-3115
• Publisher: Elsevier
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
Mechanical alloying
Nanoparticle
ODS austenitic steel
Small-angle neutron scattering (SANS)
Spark plasma sintering (SPS)
contrast variation analysis