Vacancy type defects in oxide dispersion strengthened steels

V. Slugeň*, J. Veterníková, J. Degmová, S. Kilpeläinen, V. Kršjak

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Abstract

This study was focused on commercial oxide-dispersion strengthened (ODS) steels - MA 956 (20%Cr), PM 2000 (19%Cr), ODM 751 (16%Cr) and MA 957 (14%Cr) developed for fuel cladding of Generation IV reactors. The ODS steels are investigated in order to compare their microstructure features. Vacancy defects were observed by Doppler broadening spectroscopy and positron annihilation lifetime spectroscopy. Residual stress proportional to all kinds of defects was investigated by magnetic Barkhausen noise measurement. The highest presence of vacancy defects was found in MA 956 and the lowest defect concentration in MA 957, although this steel contains the largest defects (six-vacancies together with dislocations or mono-vacancies). Other investigated steels contained probably three- or four-vacancy clusters. Further, the results from the positron techniques indicated a relation between the chromium content and the defect concentration. The magnetic Barkhausen noise results also showed that a peak position (describing a grain size) increased with the chromium content. However residual stress was independent of a chromium level.

Original languageEnglish
Title of host publicationPositron and Positronium Chemistry X
Pages264-269
Number of pages6
DOIs
Publication statusPublished - 2013
MoE publication typeA4 Article in a conference publication
EventInternational Workshop on Positron and Positronium Chemistry - Smolenice Castle, Smolenice, Slovakia
Duration: 5 Sep 20119 Sep 2011
Conference number: 10

Publication series

NameMaterials Science Forum
Volume733
ISSN (Print)02555476

Conference

ConferenceInternational Workshop on Positron and Positronium Chemistry
Abbreviated titlePPC
CountrySlovakia
CitySmolenice
Period05/09/201109/09/2011

Keywords

  • Doppler broadening spectroscopy
  • Magnetic barkhausen noise
  • ODS steels
  • Positron annihilation lifetime spectroscopy

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