Microstructural investigation and identification of intermetallic σ-phase in solution annealed 316L-type austenitic stainless steel

نویسندگان

چکیده

MYRRHA (Multi-purpose hYbrid Research Reactor for High-tech Applications) is an accelerator driven system, currently under development at SCK CEN in Mol, Belgium. This nuclear system will use liquid Lead-Bismuth eutectic alloy as a spallation target fast neutron production and coolant. The ideal structural material metal cooled reactor should be unsusceptible to both embrittlement corrosion, while possessing high toughness. Nuclear grade austenitic stainless steels similar AISI 316L have therefore been chosen the main candidate materials MYRRHA. In framework of qualification those candidates, specific batch this has shown unexpectedly poor mechanical properties, which triggered need in-depth microstructural analysis. behaviour was attributed unexpected undesired presence intermetallic σ-phase. σ-phase identified with confidence by combining data chemical composition from energy-dispersive X-ray spectroscopy crystallographic information electron backscatter diffraction comparing simulated Kikuchi patterns experimentally recorded ones. At first sight optical appearance resembles δ-ferrite islands, results risk overlooking when only classical methods are used. When left undetected, testing including brittle environment, combination miniature test specimens, could lead misinterpretation matrix.

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ژورنال

عنوان ژورنال: Materials Characterization

سال: 2021

ISSN: ['1044-5803', '1873-4189']

DOI: https://doi.org/10.1016/j.matchar.2021.111524