DEVELOPMENT OF LOW ACTIVATION MARTENSITIC STAINLESS STEELS
An evaluation has been made of the properties obtainable from elementally substituted martensitic stainless steels, the objective being to achieve properties comparable with those of an established 12%CrMoVNb steel in a composition that would allow hands-on recycling after 100y storage. Tungsten and increased contents of vanadium have been identified as alternative strengthening additions and their effects on the structure and properties of 0.15%C, 9 and 11%Cr steels have been studied. The closest approach to the reference steel was obtained with a composition of 11% Cr, 3% W and 0.24% V, which gave 0.1% proof strengths of 100 MPa and 490 MPa and room temperature and 500 degrees C. In all the steels studied, the principal precipitate at 675 degrees C was M|2|3C|6 carbide. The Laves phase M|2W was formed in the 3%W steels averaged at 675 degrees C and this, together with the relatively coarse prior austenite grain size, probably accounts for the comparatively low toughness in the averaged condition. It is concluded that 9 and 11%Cr, 1- 3.0%W, 0.25-0.5%V steels form the basis for further development of low activity martensitic alloys.
Bibliographic Reference: WRITE TO THE LIBRARIAN, UKAEA, CULHAM LABORATORY, ABINGDON, OXON OX14 3DB (UK), MENTIONING REPORT CLM-P771, 1986
Record Number: 1989124095200 / Last updated on: 1987-01-01
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