SYMPOSIA PAPER Published: 01 January 1994
STP23961S

Microstructural Studies in Fast Reactor Irradiated FV448 Ferritic-Martensitic Alloy Plate and Weldment

Source

The microstructure of an off-normal 12%Cr FV448-grade ferritic-martensitic weldment with 4.7 wt.% nickel addition has been compared with that of parent plate following fast reactor irradiation at 465°C to damage levels in the range 28–46 dpa. The fully martensitic weld metal exhibits instability under irradiation and transforms to a duplex austenitic/-martensitic structure with high void swelling in the austenite. Irradiation-induced precipitation differs between weldment and parent plate. M6X and G-phase are dominant phases formed in the plate; however, large δ-ferrite grains in the heat-affected zone contain only G-phase. Differences in precipitation in FV448 observed in earlier studies can be rationalized in terms of parameters which influence radiation-induced segregation.

Author Information

Morgan, TS
Institute of Polymer Technology and Materials Engineering, University of Technology, Loughborough, Leicestershire, United Kingdom
Little, EA
Materials and Chemistry Division, Harwell Laboratory, Oxfordshire, United Kingdom
Faulkner, RG
Institute of Polymer Technology and Materials Engineering, University of Technology, Loughborough, Leicestershire, United Kingdom
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Details
Developed by Committee: E10
Pages: 607–621
DOI: 10.1520/STP23961S
ISBN-EB: 978-0-8031-5262-5
ISBN-13: 978-0-8031-1488-3