Kennametal Inc.

Martin G Perez

Michael J Meyer

Qingjun Zheng

Abdelhakim Belhadjhamida

Paul D Prichard

Kevin Michael Gamble

Matthew Yao

Loretta M Bell

John Skwara

Robert W Monds

Michael Meyer

Powder alloy compositions and associated additive manufacturing techniques are described herein for production of sintered articles with microstructure and/or enhanced wear and corrosion resistance. In some embodiments, an article comprises sintered cobalt-based alloy having chromium carbide precipitates dispersed therein, the chromium carbide precipitates having an average size less than 4 μm.

Sintered alloy articles and methods of making the same

Wear resistant articles are described herein which, in some embodiments, mitigate CTE differences between wear resistant components and metallic substrates. In one aspect, an article comprises a layer of sintered cemented carbide bonded to a layer of iron-based alloy via a metal-matrix composite bonding layer, wherein coefficients of thermal expansion (CTE) of the sintered cemented carbide layer, metal matrix composite bonding layer, and iron-based alloy layer satisfy the relation: wherein 0.5&#x2264;x&#x2264;2 and CTE WC, CTE MMC and CTE Fe are the CTE values for the sintered cemented carbide, metal matrix composite, and iron-based alloy in 1/K respectively at 900&#xb0; C. to 1100&#xb0; C.

Wear resistant articles and applications thereof

In one aspect, composite preforms are provided for imparting wear resistance to superalloy articles. The composite preforms can be employed for metallurgically bonding alloy wear plates or pads to superalloy articles. A composite preform, in some embodiments, comprises a powder alloy composition comprising 1-30 wt. % nickel, 0.05-2 wt. % iron, 15-25 wt. % chromium, 10-30 wt. % molybdenum, 0-1 wt. % carbon, 1-5 wt. % silicon, 0.05-2 wt. % boron, 0-5 wt. % tungsten, 0-3 wt. % tantalum, 0-0.1 wt % manganese, 0-3 wt. % aluminum, 0-0.1 wt % yttrium and the balance cobalt.

Imparting wear resistance to superalloy articles

Methods of superalloy article repair are provided. In some embodiments, a method for repairing a nickel-based superalloy article comprises providing a layered assembly over a damaged region of the nickel-based superalloy article, the layered assembly comprising a nickel-based superalloy preform, an infiltration alloy preform and a melting point depressant component. The layered assembly is heated to form a nickel-based filler alloy metallurgically bonded to the damaged region, wherein primary carbide and secondary carbide phases are present in the nickel-based filler alloy in a combined amount of 0.5 to 10 vol. %.

Layered assemblies for superalloy article repair

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Latrobe, PA, United States of America

Martin G Perez