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United Technologies Corporation

Youping Gao

Sergey Mironets

Agnes Klucha

Jeffrey D Haynes

Michael C Reiter

John J Keremes

Joel G Landau

Methods of fabricating objects using additive manufacturing are provided. The methods create in situ dispersoids within the object. The methods are used with refractory alloy powders which are pretreated to increase the oxygen content to between 500 ppm and 3000 ppm or to increase the nitrogen content to between 250 ppm and 1500 ppm. The pretreated powders are then formed into layers in an environmentally controlled chamber of an additive manufacturing machine. The environmentally controlled chamber is adjusted to have between 500 ppm and 200 ppm oxygen. The layer of pretreated powder is then exposed to a transient moving energy source for melting and solidifying the layer; and creating in situ dispersoids in the layer.

Methods for in situ formation of dispersoids strengthened refractory alloy in 3D printing and/or additive manufacturing

A pulverant material supply system has an outer shell, an inner shell, and a plurality of openings to a passage within the inner shell to allow a reducing fluid into the pulverant material contained therein. The liner is made from a non-evaporable getter alloy.

Absorbed impurities reduction in additive manufacturing systems

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Thousand Oaks, CA, United States of America

Youping Gao