Study of residual stress and vacancy defects in oxide dispersion strengthened steels

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A4 Artikkeli konferenssijulkaisussa
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Date

2012

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Department of Applied Physics

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Language

en

Pages

6

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Positron Studies of Defects 2011, pp. 98-103, Physics Procedia ; Volume 35

Abstract

This study was focused on commercial oxide-dispersion strengthened (ODS) steels - MA 956 (20%Cr), ODM 751 (16%Cr) and ODS Eurofer (9%Cr), developed for fuel cladding of GEN IV reactors. The ODS steels are described in order to comparison their microstructure features. Vacancy defects were observed by Doppler Broadening Spectroscopy (DBS) and Positron Annihilation Lifetime Spectroscopy (PALS). Residual stress proportional to all kinds of defects was investigated by Magnetic Barkhausen Noise (MBN) measurement. The positron techniques demonstrated the highest defect concentration for ODS Eurofer followed by MA 956. The lowest defect density belongs to ODM 751; although these defects are the largest (three or four vacancy clusters). MA 956 and ODS Eurofer have di-vacancies in predominance. MBN results are in a good accordance with positron techniques. The highest residual stress is for ODS Eurofer, followed by MA 956. Finally, the lowest residual stress proportional to hardness is found for ODM 751. (c) 2012 The Authors Published by Elsevier B.V. Selection and/or peer-review under responsibility of Organizing Committee.

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Keywords

ODS steels, Positron Annihilation Lifetime Spectroscopy, Doppler Broadening Spectroscopy, Magnetic Barkhausen Noise, SLOW POSITRON BEAM, ANNIHILATION, ALLOYS

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DOI

10.1016/j.phpro.2012.06.018

Citation

Sluge, V, Veternikova, J & Kilpeläinen, S 2012, Study of residual stress and vacancy defects in oxide dispersion strengthened steels . in S Eijt & H Schut (eds), Positron Studies of Defects 2011 . Physics Procedia, vol. 35, Elsevier, pp. 98-103, International Workshop on Positron Studies of Defects, Delft, Netherlands, 28/08/2011 . https://doi.org/10.1016/j.phpro.2012.06.018

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https://urn.fi/URN:NBN:fi:aalto-201705113944

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[article-cris] Perustieteiden korkeakoulu / SCI