Grain refinement during primary breakdown of alloy 718

Conference · Thu Jan 01 00:00:00 EST 1987

OSTI ID:5684665

Mataya, M C; Robinson, M L; Chang, D; Weis, M J; Edwards, G R; Matlock, D K

Grain refinement during primary breakdown of a production size alloy 718 ingot was investigated by compression testing of cylindrical specimens taken from various locations in the ingot cross section. Deformation was applied over a temperature range of 900 to 1150/sup 0/C, at strain rates from 0.1s/sup -1/ to 1.0s/sup -1/, and to strains of 0.25 to 1.0. Variations in grain morphology and orientation had a pronounced effect on the deformed sample geometry but little effect on recrystallization. Recrystallization was observed to nucleate at primary particles and high angle grain boundaries. Static recrystallization rather than dynamic recrystallization was the mechanism responsible for refinement of the coarse cast structure. The cycle time for one pass was identified as the criticl processing variable with respect to microstructural evolution for a set of deformation conditions typically used during breakdown by radial forging. 10 refs., 18 figs.

• Research Organization: Rockwell International Corp., Golden, CO (USA). Rocky Flats Plant; Carpenter Technology Corp., Reading, PA (USA); Colorado School of Mines, Golden (USA). Advanced Steel Processing and Products Research Center
• DOE Contract Number: AC04-76DP03533
• OSTI ID: 5684665
• Report Number(s): RFP-4123; CONF-8710264-1; ON: DE88005193
• Resource Relation: Conference: Iron and Steel Society of ATME, Toronto, Canada, 23 Oct 1987; Other Information: Portions of this document are illegible in microfiche products
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
INCONEL 718
DEFORMATION
GRAIN REFINEMENT
RECRYSTALLIZATION
MICROSTRUCTURE
STRAIN RATE
THERMOMECHANICAL TREATMENTS
ALLOYS
CHROMIUM ALLOYS
CRYSTAL STRUCTURE
FABRICATION
HEAT TREATMENTS
INCONEL ALLOYS
MATERIALS WORKING
MOLYBDENUM ALLOYS
NICKEL ALLOYS
NICKEL BASE ALLOYS
NIOBIUM ALLOYS
360102* - Metals & Alloys- Structure & Phase Studies