Ductility in hot isostatically pressed 250-grade maraging steel

Journal Article · Wed Mar 01 04:00:00 EST 1978 · Metall. Trans., A; (United States)

DOI:https://doi.org/10.1007/BF02646392· OSTI ID:6517162

German, R M ^[1]; Smugeresky, J E

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1. Mott Metallurgical Corp., Farmington, CT

Prealloyed 250-grade maraging steel powder produced by the rotating electrode process was fully consolidated by hot isostatic pressing (HIP) at 1100 and 1200/sup 0/C. The strength following aging (3 h 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 power 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.

• OSTI ID: 6517162
• Journal Information: Metall. Trans., A; (United States), Journal Name: Metall. Trans., A; (United States) Vol. 9:3; ISSN MTTAB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360101 -- Metals & Alloys-- Preparation & Fabrication
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
DUCTILITY
EXTRUSION
FABRICATION
FAILURES
FRACTURES
HOT PRESSING
IRON ALLOYS
IRON BASE ALLOYS
MARAGING STEELS
MATERIALS WORKING
MECHANICAL PROPERTIES
METALLURGY
NICKEL ALLOYS
POWDER METALLURGY
POWDERS
PRESSING
STEELS
SURFACES
TENSILE PROPERTIES
TITANIUM ADDITIONS
TITANIUM ALLOYS