The hot deformation behavior of an as-cast alloy 718 ingot
The hot deformation characteristics of an as-cast 406mm diameter vacuum induction melted-vacuum arc remelted alloy 718 ingot were investigated as a function of strain, strain rate, and temperature with high temperature compression tests between 950/degree/C and 1150/degree/C. The compression data exhibited a peak in the flow stress followed by extensive strain softening at low temperatures and essentially constant flow stresses at high temperatures. The observed transition in deformation behavior was attributed to the effects of temperature on strain softening mechanisms, primarily dynamic recovery, adiabatic heating and its effects on dynamic recovery, and shear band formation. The data suggest that hot working in the temperature range of 1050--1150/degree/C will enhance uniform breakdown through larger sections. Microstructural analysis with both light and electron microscopy, showed that limited dynamic recrystallization occurred. The results are analyzed to identify mechanisms for microstructural refinement in cast ingots. 26 refs., 17 figs.
- Research Organization:
- Rockwell International Corp., Golden, CO (USA). Rocky Flats Plant
- DOE Contract Number:
- AC04-76DP03533
- OSTI ID:
- 6001579
- Report Number(s):
- RFP-4330; CONF-890646-3; ON: DE89010427
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
CHROMIUM ALLOYS
COMPRESSION
CRYSTAL STRUCTURE
DEFORMATION
FABRICATION
HOT WORKING
IRON ALLOYS
MATERIALS WORKING
MICROSTRUCTURE
NICKEL ALLOYS
NICKEL BASE ALLOYS
NIOBIUM ALLOYS
RECRYSTALLIZATION
STRAIN RATE
STRAINS
TEMPERATURE EFFECTS
VERY HIGH TEMPERATURE