Vacancy Type Defects in Oxide Dispersion Strengthened Steels

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 GEN IV reactors. The ODS steels are described in order to comparison of 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 highest presence of open volume 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). Other investigated steels demonstrated probably three- or four-vacancy clusters. Further, results from positron technique indicated proportionality of chromium content to defect concentration. Magnetic Barkhausen noise results also showed that Hpeak value (describing grain size) increased with growth of chromium content. However residual stress was independent on chromium level.

• Periodical: Materials Science Forum (Volume 733)
• Pages: 264-269
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.733.264
• Online since: November 2012
• Authors: Vladimir Slugeň, Jana Veterníková, Jarmila Degmová, S. Kilpeläinen, F. Tuomisto, V. Kršjak
• Keywords: Doppler Broadening Spectroscopy, Magnetic Barkhausen Noise (MBN), Oxide Dispersion Strengthened Steel, Positron Annihilation Lifetime Spectroscopy (PALS)

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