Tensile properties of extrusion consolidated Type 304 SS rapidly solidified powders
Rapidly solidified Type 304 SS powders prepared by centrifugal atomization (CA) using helium as a quench gas and having a dendritic microstructure were hot extruded, resulting in fully consolidated bars with a recrystallized fine grain size. The extruded bar, as well as the powder, contained 8 appM of entrapped helium acquired during powder processing. Prior to tensile testing, the specimens were given various preconditioning heat treatments (PCHTs). The tests were conducted in air over a temperature range of 24 to 800/sup 0/C at a strain rate of approximately 10/sup -4//s. The tensile properties of the CA 304 SS extruded powders were compared to an ingot metallurgy (I/M) Type 304 SS material with a similar chemistry. The tensile strengths and reductions in area were superior for the powders, compared to the I/M material, but uniform and total elongations were slightly lower. There were no obvious helium influences associated with the ductilities, e.g., embrittlement. The preconditioning heat treatments for the powder specimens had a significant influence on the strength properties. Strengthening mechanisms are discussed, including grain size, entrapped helium influences and apparent carbide effects. 6 refs., 14 figs., 1 tab.
- Research Organization:
- EG and G Idaho, Inc., Idaho Falls (USA)
- DOE Contract Number:
- AC07-76ID01570
- OSTI ID:
- 5906327
- Report Number(s):
- EGG-M-27186; CONF-861063-9; ON: DE87014875
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360101 -- Metals & Alloys-- Preparation & Fabrication
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
CARBIDES
CARBON COMPOUNDS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
COMPARATIVE EVALUATIONS
CORROSION RESISTANT ALLOYS
CRYSTAL STRUCTURE
ELEMENTS
ELONGATION
EMBRITTLEMENT
EXTRUSION
FABRICATION
FLUIDS
GASES
GRAIN SIZE
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
HEAT TREATMENTS
HELIUM
HIGH TEMPERATURE
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
MATERIALS WORKING
MECHANICAL PROPERTIES
MEDIUM TEMPERATURE
METALLURGY
MICROSTRUCTURE
NICKEL ALLOYS
NONMETALS
PHASE TRANSFORMATIONS
POWDER METALLURGY
POWDERS
PROCESSING
RARE GASES
SIZE
SOLIDIFICATION
STAINLESS STEEL-304
STAINLESS STEELS
STEELS
STRAIN RATE
STRAINS
TEMPERATURE EFFECTS
TENSILE PROPERTIES
VERY HIGH TEMPERATURE