Ductility in hot isostatically pressed 250-grade maraging steel

Conference · Tue Mar 01 04:00:00 EST 1977

OSTI ID:7308117

German, R M; Smugeresky, J E

Prealloyed 250-grade maraging steel powder produced by the rotating electrode process was fully consolidated by hot isostatic pressing (HIP) at 1100/sup 0/ and 1200/sup 0/C. The strength following aging (3 hr at 480/sup 0/C) equalled that of wrought material; however, ductility was negligible. This lack of ductility in the powder metallurgy product was traced to titanium segregation which occurred at the powder surface during powder production. The formation of a titanium intermetallic at the prior particle boundaries during aging caused failure at low plastic strains. Altered aging treatments successfully broke up the embrittling film and resulted in a significant ductility recovery for the HIP material. Analysis of the fracture process indicates that further ductility gains are possible by reducing the titanium content, refining the particle size, and optimizing the thermal cycles.

• Research Organization: Sandia Labs., Albuquerque, NM (USA)
• OSTI ID: 7308117
• Report Number(s): SAND-76-8516; CONF-7609106-6
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360101* -- Metals & Alloys-- Preparation & Fabrication
360103 -- Metals & Alloys-- Mechanical Properties
ALLOYS
ALUMINIUM ADDITIONS
ALUMINIUM ALLOYS
COBALT ALLOYS
DUCTILITY
FABRICATION
HOT PRESSING
IRON ALLOYS
IRON BASE ALLOYS
MANGANESE ADDITIONS
MANGANESE ALLOYS
MATERIALS WORKING
MECHANICAL PROPERTIES
METALLURGY
MOLYBDENUM ALLOYS
NICKEL ALLOYS
POWDER METALLURGY
PRESSING
SILICON ADDITIONS
SILICON ALLOYS
SINTERED MATERIALS
TENSILE PROPERTIES
TITANIUM ADDITIONS
TITANIUM ALLOYS
VERY HIGH TEMPERATURE