Structure and Property Control through Rapid Quenching of Liquid Metals
Semi-annual technical rept. no. 3, 1 Jul-31 Dec 1971
MASSACHUSETTS INST OF TECH CAMBRIDGE CENTER FOR MATERIALS SCIENCE AND ENGINEERING
Pagination or Media Count:
Various powder metallurgy PM and quench-casting techniques were employed to generate extremely fine dendrite arm spacings and homogeneous structures. Iron, nickel and cobalt-base alloy powders, produced by steam atomization coarse powders, argon atomization, vacuum atmoization, and the rotating electrode process, were consolidated into dense billets by hot isostatic pressing HIP andor extrusion. New powder processes based on separating solid nodules from a liquid-solid mixture and random break up of a fine stream of liquid metal into spherical particles are being evaluated. The hot working properties of PM billets and quench-cast bars were evaluated by hot rolling, high strain rate tests, and creep superplastic testing. Two PM superalloys, MAR-M-509 cobalt-base and IN-100 nickel-base after HIP and hot extrusion demonstrated excellent hot workability under high strain rate and creep forming conditions, respectively.
- Properties of Metals and Alloys
- Fabrication Metallurgy