Disclosed herein are embodiments of a nickel-based alloy. In particular embodiments, the nickel-based alloy is configured for use in applications involving supercritical fluids. The disclosed nickel-based alloy embodiments are highly resistant to corrosion and exhibit high stability and thus are suited for use in vessels, boilers, piping, and other receptacles that contain or are used with supercritical fluids. Method embodiments of making the nickel-based alloy also are disclosed.

The present invention relates to a method for producing metal-comprising geometrically complex pieces and/or parts. The method is specially indicated for highly performant components. It is disclosed a method for the production of complex geometry, and even large, highly performant metal-comprising components in a cost effective way. The method is also indicated for the construction of components with internal features and voids. The method is also beneficial for light construction. The method allows the reproduction of bio-mimetic structures and other advanced structures for topological performance optimization.

Disclosed herein are embodiments of a nickel-based alloy. In particular embodiments, the nickel-based alloy is configured for use in applications involving supercritical fluids. The disclosed nickel-based alloy embodiments are highly resistant to corrosion and exhibit high stability and thus are suited for use in vessels, boilers, piping, and other receptacles that contain or are used with supercritical fluids. Method embodiments of making the nickel-based alloy also are disclosed.

A heat treatment method for an additive manufactured object formed of a laminate-molded Ni-base alloy includes: a heat treatment step for carbide precipitation optimization of heating the additive manufactured object for 1 hour or longer and 100 hours or shorter at a temperature which is equal to or higher than a temperature T1 determined by Formula (1) according to amounts of component elements and is equal to or lower than 1,350° C.; and an aging treatment step of heating the additive manufactured object for 1 to 30 hours at a temperature of 800° C. to 950° C. after the heat treatment step for carbide precipitation optimization.
T1 (° C.)=177×Ni (%)+176×Co (%)+172×Cr (%)+178×Mo (%)+174×W (%)+171×Al (%)+170×Ti (%)+168×Ta (%)+163×Nb (%)+307×C (%)−16259  (1)

An austenitic alloy based on nickel, chromium and iron, and having a high aluminum content, intended for use at a given operating temperature (Ts) between 900° C. and 1200° C., the alloy comprising the following elements, in weight percent: chromium between 20% and 32%, nickel between 30% and 60%, aluminum between 3.5% and 6%, carbon between 0.4% and 0.7%, titanium between 0.05% and 0.3%, niobium and/or tantalum between 0.6% and 2%, an element, composed of at least one rare earth and/or hafnium, between 0.002% and 0.1%, silicon between 0 and 0.5%, manganese between 0 and 0.5%, tungsten between 0 and 2%, and iron as the balance of the elements in the alloy. The alloy has less than 1% by volume of an intermetallic B2-NiAl phase and less than 1% by volume of an alpha prime phase rich in chromium, after subjecting the alloy to an operating temperature (Ts).

An alloy that may include nickel, aluminum from 4.8 wt. % to 5.15 wt. %; cobalt from 18 wt. % to 19 wt. %, chromium from 11.9 wt. % to 12.9 wt. %, molybdenum from 2.8 wt. % to 3.6 wt. %, and niobium from 0.05 wt. % to 0.1 wt. %. The alloy may further include tungsten from 0.05 wt. % to 0.1 wt. %. The alloy may further include tantalum from 0.05 wt. % to 0.1 wt. %.

A method of processing a metal alloy includes heating to a temperature in a working temperature range from a recrystallization temperature of the metal alloy to a temperature less than an incipient melting temperature of the metal alloy, and working the alloy. At least a surface region is heated to a temperature in the working temperature range. The surface region is maintained within the working temperature range for a period of time to recrystallize the surface region of the metal alloy, and the alloy is cooled so as to minimize grain growth. In embodiments including superaustenitic and austenitic stainless steel alloys, process temperatures and times are selected to avoid precipitation of deleterious intermetallic sigma-phase. A hot worked superaustenitic stainless steel alloy having equiaxed grains throughout the alloy is also disclosed.

The present invention relates to a Ni-based heat-resistant alloy including Ir: 5.0 mass % or more and 50.0 mass % or less, Al: 1.0 mass % or more and 8.0 mass % or less, W: 5.0 mass % or more and 25.0 mass % or less, and balance Ni, having an L1.sub.2-structured γ′ phase present in the matrix, and including at least one of Zr: 0.01 mass % or more and 3.0 mass % or less and Hf: 0.01 mass % or more and 3.0 mass % or less. This Ni-based heat-resistant alloy has improved toughness over a conventional Ni-based heat-resistant alloy based on a Ni—Ir—Al—W-based alloy, and is also excellent in ambient-temperature strength.

Electric-powered, closed-loop, continuous-feed, endothermic energy-conversion systems and methods are disclosed. In one embodiment, the presently disclosed energy-conversion system includes a shaftless auger. In another embodiment, the presently disclosed energy-conversion system includes a drag conveyor. In yet another embodiment, the presently disclosed energy-conversion system includes a distillation and/or fractionating stage. The endothermic energy-conversion systems and methods feature mechanisms for natural resource recovery, refining, and recycling, such as secondary recovery of metals, minerals, nutrients, and/or carbon char.

In a non-limiting example, an article having a body including a nickel-based superalloy is provided. The nickel-based superalloy has a microstructure that includes a gamma phase matrix and a gamma prime phase including a plurality of rafting-resistant gamma prime particles dispersed in the gamma phase matrix. The plurality of the rafting-resistant gamma prime particles has an average particle perimeter of about 3 microns to about 15 microns, an average aspect ratio of about 1.2 to about 3, and where the microstructure of the nickel-based superalloy is substantially uniform throughout the body.