Nickel-based high temperature alloy and design method thereof

Abstract

The invention relates to a nickel-based high temperature alloy and a design method thereof, and relates to the technical field of alloy design and additive manufacturing. According to the main adopted technical scheme, the nickel-based high temperature alloy is prepared through an additive manufacturing process, and the contents of alloy elements, used for promoting precipitation of a gamma'-Ni3Al second phase, in the nickel-based high temperature alloy meet the conditions that the volume fraction of the gamma'-Ni3Al second phase in the nickel-based high temperature alloy ranges from 45% to 60%, and the content of a Ti element in the nickel-based high temperature alloy ranges from 0 to 4 wt%; and the alloy elements, used for promoting precipitation of the gamma'-Ni3Al second phase, in the nickel-based high temperature alloy comprise an Al element, and preferably, the alloy elements further comprise the Ti element and/or a Ta element. According to the nickel-based high temperature alloy, the content of the gamma'-Ni3Al second phase in the nickel-based high temperature alloy serves as a key parameter for balancing the high-temperature mechanical property and the additive manufacturing formability, the gamma'-Ni3Al phase content is controlled within the range of 45%-60%, and therefore the mechanical property and the formability of the nickel-based high temperature alloy are both considered. A guiding idea can be provided for research and development of the high-performance nickel-based high temperature alloy special for additive manufacturing.

Description

Technical field [0001] The present invention relates to an alloy design and a fabrication technique, in particular, to a nickel-based high temperature alloy and its design method thereof. Background technique [0002] The nickel-based high-temperature alloy has excellent physical and mechanical properties, which can be used for long-term reliability of high temperatures and complex stresses, and is widely used in the manufacture of aerospace, aerospace, and ship engines. [0003] At present, the preparation technique of nickel-based high-temperature alloy members mainly includes three types of melting casting techniques, powder metallurgy technology and deformation technology. In order to adapt to different preparation techniques, researchers have developed different types of alloy materials such as K465, K438, K417 and other cast alloys, FGH95, FGH96, FGH97 and other powders, GH4169, GH3536, GH3230 and other deformation alloys. Different kinds of alloys have unique components an...

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Problems solved by technology

When using alloys developed for traditional preparation technologies for additive manufacturing, such as deformed alloys such as GH4169 and GH3536, although they can be formed, these alloys have low high-temperature strength and are not suitable for components that require high-temperature mechanical properties; However, cast superalloys such as K465, K438, and K417 with high high-temperature performance are prone to cracks and other defects during the additive manufacturing process, and the formability is extremely poor.

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