TiAl Alloy Composition for Faster Hot Forging Without Creep Loss
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Solution Overview
Problem
Conventional titanium aluminide (TiAl) alloy materials have low ductility and processability, leading to low forging speed and manufacturing efficiency in hot forging processes, while improvements in forgeability often result in decreased strength.
Innovation Solution
A titanium aluminide alloy material with a chemical composition including 38.0% to 39.9% aluminum, 3.0% to 5.0% niobium, 3.0% to 4.0% vanadium, 0.05% to 0.15% carbon, and optional boron, designed to expand the β-phase region in the phase diagram, enhancing high-temperature forgeability without compromising creep strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional TiAl alloy material is used for hot forging, then the material maintains high creep strength, but the forging speed is low and manufacturing efficiency is poor due to low ductility and processability
Solution Approach 1:
The patent changes the chemical composition parameters of the TiAl alloy by precisely controlling the content of aluminum (38.0-39.9 at%), niobium (3.0-5.0 at%), vanadium (3.0-4.0 at%), and carbon (0.05-0.15 at%). This parameter optimization improves the material's ductility and processability during hot forging, enabling higher forging speeds while maintaining creep strength.
2Productivity
If the TiAl alloy material is modified to enhance forgeability, then the forging speed increases, but the strength of the TiAl alloy material decreases
Solution Approach 1:
The patent creates a composite alloy system by combining TiAl base material with specific amounts of niobium, vanadium, and carbon elements. This composite composition achieves a balance between forgeability and creep strength, allowing high-speed forging without compromising the material's high-temperature strength properties.
Solution Approach 2:
The patent optimizes the concentration parameters of alloying elements to simultaneously improve forgeability and maintain creep strength. The specific ranges of Nb (3.0-5.0 at%), V (3.0-4.0 at%), and C (0.05-0.15 at%) are carefully controlled to achieve this dual objective.
3Manufacturing precision
If the TiAl alloy material is processed by isothermal forging at low strain rate, then the material quality is maintained, but the manufacturing efficiency and economic efficiency are reduced
Solution Approach 1:
The patent modifies the material's inherent properties through optimized composition parameters, enabling it to withstand higher strain rates during forging. This allows the process to be executed at high speeds while maintaining product quality, thereby improving manufacturing efficiency.
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 improved TiAl alloy material achieves enhanced high-temperature forgeability and maintains high creep strength, allowing for faster and more efficient hot forging processes while ensuring the quality and strength of the forged products.
Implementation Method 1
designed to expand the β-phase region in the phase diagram, enhancing high-temperature forgeability
Data Source
AI summary
A titanium aluminide alloy material for hot forging has a chemical composition including, by atom, aluminum of 38.0% or greater and 39.9% or less, niobium of 3.0% or greater and 5.0% or less, vanadium of 3.0% or greater and 4.0% or less, carbon of 0.05% or greater and 0.15% or less, and titanium and an inevitable impurity as a residue.