Creep resistant rhenium-free nickel based superalloy

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This invention describes a nickel-based superalloy that does not contain the expensive and scarce element rhenium, but still achieves high creep resistance at elevated temperatures suitable for demanding applications such as turbine blades. The alloy uses a carefully balanced composition of elements such as aluminum, cobalt, chromium, molybdenum, tantalum, titanium, and tungsten, with tungsten distributed predominantly in the alloy matrix. The unique composition and microstructure provide high strength and temperature resistance, similar to or exceeding existing rhenium-containing superalloys.

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• Turbine blades in gas turbines for power generation or aviation
• Jet engine components exposed to extreme temperatures and mechanical stresses
• Stationary or industrial gas turbines
• High-temperature structural components requiring long-term durability
• Aerospace engine parts subjected to high creep and thermal loads

BenefitsContent extracted from patent full text and abstract with AI.

• Eliminates the need for rhenium, reducing material costs and dependency on scarce elements
• Provides high creep resistance and mechanical stability at temperatures above 1300°C, matching or surpassing conventional rhenium-based superalloys
• Facilitates the production of cast, single-crystal, or directionally solidified turbine components
• Supports efficient and economical manufacturing due to improved castability and reduced reliance on critical raw materials
• Enables reliable operation of turbine components under extreme service conditions, improving engine life and performance

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Patent Abstract

The nickel-based alloy comprises 11-13 atomic% aluminum, 4-14 atomic% cobalt, 6-12 atomic% chromium, 0.1-2 atomic% molybdenum, 0.1-3.5 atomic% tantalum, 0.1-3.5 atomic% titanium, 0.1-3 atomic% tungsten, and nickel and unavoidable impurity as remainder. The nickel-based alloy consists of a matrix (gamma ) containing 50 volume% precipitated (gamma )-phase and 0.15-0.25 volume% precipitated (gamma /gamma )-phase at a temperature of 1050-1100[deg] C. The nickel-based alloy does not contain rhenium, and has a solidus temperature of more than 1320[deg] C. The nickel-based alloy comprises 11-13 atomic% aluminum, 4-14 atomic% cobalt, 6-12 atomic% chromium, 0.1-2 atomic% molybdenum, 0.1-3.5 atomic% tantalum, 0.1-3.5 atomic% titanium, 0.1-3 atomic% tungsten, and nickel and unavoidable impurity as remainder. The nickel-based alloy consists of a matrix (gamma ) containing 50 volume% precipitated (gamma )-phase and 0.15-0.25 volume% precipitated (gamma /gamma )-phase at a temperature of 1050-1100[deg] C. The nickel-based alloy does not contain rhenium, and has a solidus temperature of more than 1320[deg] C. The amount of tungsten contained in the matrix (gamma ) is higher than the amount of tungsten contained in the (gamma )-phase. An independent claim is included for article.