Grain growth behavior of extrusion consolidated centrifugally atomized Type 304 stainless steel powder

Technical Report · Sun Nov 01 04:00:00 EST 1987

OSTI ID:5419537

Flinn, J E; Wright, R N; Korth, G E

A study was performed to assess the role of entrapped helium in stabilizing the microstructure. Type 304 stainless steel powders produced by centrifugal atomization (CA) were consolidated by hot extrusion. The powders contain approx.7 appM He which was retained during extrusion. Isothermal heat treatments were performed on the CA 304 SS extruded powder as well as on the attached wrought ingot metallurgy (I/M) can and a filler plug of Type 304 SS for comparisons. Compared with the wrought I/M Type 304 SS, the CA Type 304 SS extruded powder exhibited considerable grain growth retardation. Grain growth was shown to be independent of the means used for powder consolidation, including hot isostatic pressing and dynamic consolidation. Also, other CA consolidated alloy powders exhibited grain growth resistance equal to the CA Type 304 SS extruded powder. Results indicate that the entrapped helium in the CA consolidated powder materials plays a significant role in retarding grain growth. 23 figs., 5 tabs.

• Research Organization: EG and G Idaho, Inc., Idaho Falls (USA)
• DOE Contract Number: AC07-76ID01570
• OSTI ID: 5419537
• Report Number(s): EGG-SCM-7219; ON: DE88006788
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
CORROSION RESISTANT ALLOYS
CRYSTAL STRUCTURE
ELEMENTS
EXTRUSION
FABRICATION
FLUIDS
GASES
GRAIN GROWTH
GRAIN SIZE
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
HEAT TREATMENTS
HELIUM
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
MATERIALS WORKING
MICROSTRUCTURE
NICKEL ALLOYS
NONMETALS
POWDERS
RARE GASES
SIZE
STAINLESS STEEL-304
STAINLESS STEELS
STEELS