P/M processing of rare earth modified high strength steels. Technical report, 1 October 1979-30 September 1980

Technical Report · Mon Dec 01 04:00:00 EST 1980

OSTI ID:6045341

Sheinker, A A

Material processing studies were continued directed toward developing powder metallurgy methods for producing rare earth modified high strength 4340 steel with improved resistance to hydrogen embrittlement. Three different methods of making rare earth modified 4340 steel powders were investigated: hydrogen gas atomization, mechanical alloying, and rapid solidification atomization. Hot extrusion consolidation of hydrogen gas atomized 4340 steel powders at 2150 F (1450 K) resulted in much better mechanical properties after heat treatment than hot isostatic pressing (HIP) consolidation at 2100 F (1420 K), but the ductility and impact resistance properties of the extruded powders were generally lower than those of similarly heat treated, rare earth modified, wrought 4340 steels evaluated previously, at approximately the same rare earth (cerium) content.

• Research Organization: TRW, Inc., Cleveland, OH (USA)
• OSTI ID: 6045341
• Report Number(s): AD-A-094185
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360101* -- Metals & Alloys-- Preparation & Fabrication
360103 -- Metals & Alloys-- Mechanical Properties
ALLOYS
ATOMIZATION
CERIUM ALLOYS
DUCTILITY
ELEMENTS
EMBRITTLEMENT
EXTRUSION
FABRICATION
HEAT TREATMENTS
HYDROGEN EMBRITTLEMENT
IMPACT STRENGTH
IRON ALLOYS
IRON BASE ALLOYS
LANTHANUM
MATERIALS WORKING
MECHANICAL PROPERTIES
METALLURGY
METALS
NICKEL ALLOYS
PHASE TRANSFORMATIONS
POWDER METALLURGY
PROCESSING
RARE EARTH ALLOYS
RARE EARTHS
SOLIDIFICATION
STEELS
TENSILE PROPERTIES