Ion damage microstructures in a Fe-10Cr-6Mo-0. 5Nb ferritic steel
An annealed-and-aged ferritic steel containing fine NbC precipitates and relatively coarse particles of Laves phase was bombarded with 4-MeV iron ions to 100 displacements per atom (dpa) at 400 to 600/sup 0/C. Much of the damage structure consisted of dislocation tangles that coarsened with increasing temperature. Cavity formation began at 450/sup 0/C, peaked at 500 to 550/sup 0/C and was absent at 600/sup 0/C. Maximum swelling was only 0.2%. The Laves particles exhibited recoil dissolution and restructuring. Bombardments with Fe + He + D or Fe + He beams at ratios of 10 atomic parts per million (appM) He/dpa and 45 appM D/dpa introduced high concentrations of very small bubbles and comparatively few larger, bias-driven cavities. The latter were initiated at bubble clusters on NbC particles. Maximum swelling of 0.75% occurred at 550/sup 0/C. Recoil dissolution of the Laves phase was retarded by the gases. Large critical cavity sizesand unbalanced dislocation and cavity sink strengths contribute to low swelling of this alloy.
- Research Organization:
- Oak Ridge National Lab., TN (USA)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 5831734
- Report Number(s):
- CONF-860605-11; ON: DE86008500
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360106* -- Metals & Alloys-- Radiation Effects
ALLOYS
BEAMS
CHARGED PARTICLES
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-MOLYBDENUM STEELS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DISLOCATIONS
ENERGY RANGE
FERRITIC STEELS
ION BEAMS
IONS
IRON ALLOYS
IRON BASE ALLOYS
IRON IONS
LAVES PHASES
LINE DEFECTS
MEV RANGE
MEV RANGE 01-10
MICROSTRUCTURE
NIOBIUM ADDITIONS
NIOBIUM ALLOYS
PHYSICAL RADIATION EFFECTS
RADIATION EFFECTS
STEELS