Microstructural evolution of martensitic steels during fast neutron irradiation

Conference · Sun Jan 01 04:00:00 EST 1989 · Transactions of the American Nuclear Society; (USA)

OSTI ID:6388605

Maziasz, P J ^[1]

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1. Oak Ridge National Lab., TN (USA)

Irradiation of martensitic/ferritic steels with fast neutrons (E > 0.1 MeV) to displacement damage levels of 30 to 50 displacements per atom (dpa) at temperatures of 300 to 500{degree}C produces significant changes in the as-tempered microstructure. Dislocation loops and networks can be produced, irradiation-induced precipitates can form, the lath/subgrain boundary structure and the thermal precipitates produced during tempering can become unstable, and if helium is present, bubbles and voids can form. These microstructural changes caused by irradiation can have important effects on the properties of this class of steels for both fast breeder reactor and magnetic fusion reactor applications. The purpose of this paper is to compare reactor-irradiated and long-term thermally aged 9Cr-1MoVNb specimens to distinguish effects due to displacement damage from those caused by elevated-temperature exposure alone.

• OSTI ID: 6388605
• Report Number(s): CONF-891103--
• Conference Information: Journal Name: Transactions of the American Nuclear Society; (USA) Journal Volume: 60
• Country of Publication: United States
• Language: English

Related Subjects

21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
210500* -- Power Reactors
Breeding
36 MATERIALS SCIENCE
360102 -- Metals & Alloys-- Structure & Phase Studies
360106 -- Metals & Alloys-- Radiation Effects
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700209 -- Fusion Power Plant Technology-- Component Development & Materials Testing
AGING
ALLOYS
BARYONS
BREEDER REACTORS
CARBON ADDITIONS
CHROMIUM ALLOYS
CHROMIUM STEELS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DISLOCATIONS
DISPLACEMENT RATES
ELECTRON MICROSCOPY
ELEMENTARY PARTICLES
EPITHERMAL REACTORS
FAST NEUTRONS
FAST REACTORS
FBR TYPE REACTORS
FERMIONS
FERRITIC STEELS
HADRONS
HEAT TREATMENTS
HIGH ALLOY STEELS
IRON ALLOYS
IRON BASE ALLOYS
IRRADIATION
LINE DEFECTS
LIQUID METAL COOLED REACTORS
LMFBR TYPE REACTORS
MARTENSITE
MATERIALS
MICROSCOPY
MICROSTRUCTURE
MOLYBDENUM ALLOYS
NEUTRONS
NIOBIUM ADDITIONS
NIOBIUM ALLOYS
NUCLEONS
PHYSICAL RADIATION EFFECTS
PRECIPITATION
RADIATION EFFECTS
REACTOR MATERIALS
REACTORS
SEPARATION PROCESSES
STAINLESS STEELS
STEEL-CR9MONBV
STEELS
TEMPERATURE DEPENDENCE
TEMPERING
THERMAL DEGRADATION
THERMONUCLEAR REACTORS
VANADIUM ADDITIONS
VANADIUM ALLOYS