Titanium Alloy Turbine Disk Partial Hydrogenation for Dual Structure
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Solution Overview
Problem
Conventional methods for manufacturing titanium alloy dual-structure turbine disks face challenges in achieving a strong, continuous structural transition between the wheel hub and wheel rim, leading to potential fractures and defects due to weak connections and complex processing requirements.
Innovation Solution
A method involving partial hydrogenation of titanium alloy billets, where a glass coating is applied to prevent hydrogen diffusion on certain surfaces, allowing controlled hydrogen distribution through hydrogenation, followed by high-temperature die forging to achieve equiaxed and Widmanstatten structures in the wheel hub and rim respectively, with a simplified process that eliminates the need for gradient thermal processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gradient heat treatment is performed to achieve smooth structural transition, then structural continuity is improved, but manufacturing complexity and temperature control precision requirements increase
Solution Approach 1:
The patent changes the chemical composition parameter by introducing hydrogen elements with specific concentration gradients (0.05-0.15wt% in wheel rim, 0.01-0.05wt% in transition region, <0.01wt% in wheel hub) to achieve different microstructures and mechanical properties, replacing the need for complex gradient heat treatment processes
Solution Approach 2:
The patent divides the turbine disk into three distinct regions with different hydrogen concentrations: wheel rim portion, transition region, and wheel hub portion. Each region is treated differently during hydrogenation to achieve the desired dual-structure with smooth transitions
2Strength
If dual alloy method is used to meet different performance requirements, then wheel hub and wheel rim performance are improved, but connection strength and structural transition smoothness deteriorate
Solution Approach 1:
The patent applies local quality by creating different hydrogen concentration zones in different regions of the same alloy material. The wheel rim has higher hydrogen content for fracture toughness, the wheel hub has lower hydrogen content for yield strength, and the transition region has intermediate hydrogen content for smooth structural transition and strong connection
3Manufacturing precision
If multiple local loads and multiple forgings are applied to control transition region structure, then structural precision is improved, but manufacturing complexity and process steps increase
Solution Approach 1:
The patent performs preliminary hydrogenation treatment on the round billet before forging to establish the desired hydrogen concentration distribution. This preliminary action of hydrogen diffusion control simplifies subsequent forging operations and eliminates the need for multiple local loads and repeated forgings to achieve the target microstructure
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
This method ensures continuous structural performance across the transition region, simplifies the manufacturing process, and achieves the required structural properties of high yield strength, low-cycle fatigue strength, and creep resistance for the wheel hub and rim, while avoiding weak connections.
Implementation Method 1
the hydrogen element diffuses inward from the lateral side of the titanium alloy billet, so that the content of hydrogen in the titanium alloy billet is distributed in gradient from outside to inside along radial direction
Implementation Method 2
a glass coating is applied to prevent hydrogen diffusion on certain surfaces
Data Source
AI summary
The invention provides a method and a product for manufacturing a titanium alloy dual-structure turbine disk based on partial hydrogenation, which includes the following steps: coating a glass coating on the partial surface of a titanium alloy billet where hydrogen-blocking is required, and sintering the titanium alloy billet coated with the glass coating; performing hydrogenation treatment on the titanium alloy billet, such that the hydrogen concentration at the hydrogenation-required portion reaches the predetermined level; removing the glass coating from the titanium alloy billet; preheating the titanium alloy billet, and then performing high temperature die forging in the forging dies; performing vacuum dehydrogenation treatment on the forged turbine disk to remove hydrogen element inside the forging, so that the hydrogen content is 0.015 wt. % or less.