Microstructural observations on nickel--chromium--iron alloy 718 (LWBR Development Program)
Characteristic microstructures of sheet, wire, and bar are presented, as influenced by material processing conditions and as revealed by various metallographic techniques. The conditions and techniques described result from development work on NiCrFe Alloy 718 in conjunction with the LWBR Development Program. The amount of niobium carbide precipitate at grain boundaries after aging appeared to be strongly influenced by solution annealing temperature and relatively small differences in chemical composition. Fine precipitate was observed at grain boundaries after 1860/sup 0/F braze/heat treatment. During the 1800 to 1860/sup 0/F solution anneals, recrystallization and/or grain growth moved the grain boundaries from prior carbide networks, and coarse grains in duplex structures in bar underwent a refinement of grain size through recrystallization.
- Research Organization:
- Bettis Atomic Power Lab., Pittsburgh, PA (USA)
- DOE Contract Number:
- AT(11-1)-GEN-14
- OSTI ID:
- 6747212
- Report Number(s):
- WAPD-TM-1077
- Country of Publication:
- United States
- Language:
- English
Similar Records
Mechanical properties of Inconel 718 and Nickel 201 alloys after thermal histories simulating brazing and high temperature service
Effect of the pre-existing carbides on the grain boundary network during grain boundary engineering in a nickel based alloy
Related Subjects
210500* -- Power Reactors
Breeding
36 MATERIALS SCIENCE
360102 -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
BREEDER REACTORS
CHROMIUM ALLOYS
CRYSTAL STRUCTURE
DATA
INCONEL 718
INCONEL ALLOYS
INFORMATION
LWBR TYPE REACTORS
MICROSTRUCTURE
MOLYBDENUM ALLOYS
NICKEL ALLOYS
NICKEL BASE ALLOYS
NIOBIUM ALLOYS
REACTOR MATERIALS
REACTORS
THERMAL REACTORS
WATER COOLED REACTORS
WATER MODERATED REACTORS