γ-TiAl Alloy Forging via Phase Composition Control
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Solution Overview
Problem
The high production costs and process unreliability of forging γ-TiAl-based alloy materials for gas turbine components, particularly due to the need for isothermal or hot-die forging of extruded semi-finished products, hinder the development of efficient and cost-effective manufacturing methods for these components.
Innovation Solution
A γ-TiAl-based alloy material with specific phase compositions at room and eutectoid temperatures, allowing forging within a broader temperature range using conventional methods, and utilizing cast materials to reduce production costs, along with a forging method that includes thermal barrier coating and heat treatment for enhanced microstructure and properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If isothermal forging or hot-die forging of extruded semi-finished products is used to forge γ-TiAl-based alloy materials, then the forging process can be completed, but the production costs increase and process reliability decreases
Solution Approach 1:
The patent modifies the phase composition parameters of the γ-TiAl-based alloy by controlling the β-stabilizer content (0.05-5 wt%) and Al content (38-45 at%), which changes the material's phase transformation behavior and enables reliable forging within a broader temperature range without requiring complex isothermal or hot-die processes
Solution Approach 2:
The patent creates a multi-phase composite microstructure consisting of γ-TiAl, α2-Ti3Al, and β/B2-Ti phases with specific volume proportions. This composite phase structure combines the benefits of each phase: γ for strength, α2 for creep resistance, and β for ductility and forgeability, enabling conventional forging methods to achieve reliable results
2Ease of manufacture
If isothermal forging or hot-die forging of extruded semi-finished products is used to forge γ-TiAl-based alloy materials, then the forging process can be completed, but the production costs increase
Solution Approach 1:
The patent adjusts the chemical composition parameters to enable conventional forging, eliminating the need for expensive extrusion processes and complex isothermal/hot-die forging equipment. The controlled β-phase content allows standard forging machinery to achieve the required microstructure and properties
Solution Approach 2:
The patent replaces expensive extruded semi-finished products with more economical cast or rolled primary materials. By modifying the alloy composition to accommodate conventional processing, the invention eliminates the need for costly intermediate extrusion steps while maintaining final component quality
3Ease of manufacture
If a broader temperature range for forging is used, then cast materials can be used as primary material, but the microstructure control becomes more challenging
Solution Approach 1:
The patent establishes specific composition ranges (β-stabilizer: 0.05-5 wt%, Al: 38-45 at%, Ti: balance) that create a eutectoid system with controlled phase transformation temperatures. This parameter optimization ensures that even with broader forging temperature ranges, the material transforms to the desired multi-phase microstructure
Solution Approach 2:
The patent exploits the eutectoid phase transition behavior of the modified γ-TiAl alloy, where a specific phase transformation occurs at a defined temperature range. By designing the alloy to undergo this controlled phase transition during forging, the invention ensures consistent microstructure formation regardless of the exact forging temperature within the broader range
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables reliable and cost-effective production of gas turbine components with improved microstructure and performance, specifically enabling the use of cast materials and reducing the need for expensive extruded semi-finished products, while maintaining high creep resistance and ductility.
Implementation Method 1
the material has a) in the range of room temperature, the β/B2-Ti phase, the α2-Ti3Al phase and the γ-TiAl phase with a proportion of the β/B2-Ti phase of at most 5% by volume; b) in the range of the eutectoid temperature, has the β/B2-Ti phase, the α2-Ti3Al phase and the γ-TiAl phase with a proportion of the β/B2-Ti phase of at least 10% by volume
Data Source
AI summary
A material for a gas turbine component, to be specific a titanium-aluminum-based alloy material, including at least titanium and aluminum. The material has a) in the range of room temperature, the β/B2-Ti phase, the α2-Ti3Al phase and the γ-TiAl phase with a proportion of the β/B2-Ti phase of at most 5% by volume, and b) in the range of the eutectoid temperature, the β/B2-Ti phase, the α2-Ti3Al phase and the γ-TiAl phase, with a proportion of the β/B2-Ti phase of at least 10% by volume.