DED Repair Microstructure Control for Aerospace Part Restoration
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Solution Overview
Problem
Existing repair techniques for aerospace components, such as gas turbine engine components, are inadequate for achieving desired structural and functional requirements, limiting the ability to repair and extend the life of these components.
Innovation Solution
A directed energy deposition (DED) process is used to control the microstructure of each repair layer by adjusting parameters like powder feed rate, energy intensity, traversal rate, and auxiliary heating/cooling, ensuring each layer has a pre-determined microstructure to meet specific structural and functional needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional repair techniques are used on aerospace components, then the repair process is simple, but the structural and functional requirements are not met
Solution Approach 1:
The repair process is segmented into multiple sequential steps: depositing powder material, melting it with directed energy, and consolidating it layer by layer. This segmentation allows precise control over the microstructure of each repair layer, ensuring structural and functional requirements are met while managing complexity through systematic process breakdown
Solution Approach 2:
The invention controls the microstructure by changing key process parameters including powder feed rate, energy intensity, traversal rate, and auxiliary heating/cooling conditions. These parameter adjustments enable tailoring of each repair layer's microstructure to meet specific structural and functional requirements, transforming a simple repair process into a controlled manufacturing process
2Manufacturing precision
If directed energy deposition is used to control microstructure of repair layers, then the microstructure control is improved, but the process complexity increases
Solution Approach 1:
The invention systematically controls four main parameters: powder feed rate, energy intensity, traversal rate, and auxiliary heating/cooling. By establishing desired values for each parameter as part of a repair development process, the invention achieves pre-determined microstructures in each repair layer, transforming complexity into controllable variables
Solution Approach 2:
The invention incorporates a feedback mechanism where the microstructure of each repair layer is analyzed and used to adjust subsequent deposition parameters. This closed-loop control ensures that each layer achieves the desired microstructure while accounting for variations in the repair process, maintaining precision despite increased complexity
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 DED process enables effective repair of aerospace components by providing controlled microstructures, expanding the range of repair methods and extending the service life of repaired parts.
Implementation Method 1
depositing, using the DED energy/powder head, a first layer of DED powder material in the repair region; melting and consolidating, using energy from the DED energy/powder head, the first layer of DED powder material
Implementation Method 2
intensity of energy directed from the DED energy/powder head to the repair region
Implementation Method 3
auxiliary heating and/or cooling provided to the repair region
Implementation Method 4
auxiliary heating and/or cooling provided to the repair region
Data Source
AI summary
An aerospace part, which is made from a base material, is inspected to identify a worn or defective repair region that requires repair. A repair procedure is performed on the repair region using a directed energy deposition (DED) energy/powder head. The repair procedure includes depositing, using the DED energy/powder head, a first layer of DED powder material in the repair region; melting and consolidating, using energy from the DED energy/powder head, the first layer of DED powder material to form a first repair layer having a first pre-determined microstructure; and repeating the depositing and melting and consolidating steps to create a desired plurality of repair layers. Each of the plurality of repair layers has a pre-determined microstructure. The microstructure of each of the plurality of repair layers is imparted using selected levels of DED powder material feed to the repair region, intensity of energy directed from the DED energy/powder head to the repair region, rate at which the DED energy/powder head traverses the repair region, and auxiliary heating and/or cooling provided to the repair region. The aerospace part is returned to service after completion of the desired repair.