Structure and Property Control through Rapid Quenching of Liquid Metals
Final technical rept.
MASSACHUSETTS INST OF TECH CAMBRIDGE CENTER FOR MATERIALS SCIENCE AND ENGINEERING
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The report summarizes the results and accomplishments of a three year research program investigating the processing of billets from rapidly quenched liquid metals. 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 atomization, and the rotating electrode process, were consolidated into dense billets by hot isostatic pressing HIP andor extrusion. The hot working properties of PM billets quench-cast bars were evaluated by 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. Detailed analyses of microstructures, heat treatments and mechanical properties are presented for all PM alloys and compared to equivalent cast materials.
- Properties of Metals and Alloys
- Fabrication Metallurgy