Fe-Al Alloy Vibration-Damping Component with Large Grains
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Solution Overview
Problem
The rapid melting and solidification process in additive manufacturing methods for Fe—Al-based alloy vibration-damping components often generates minute defects and inclusions, hindering the movement of magnetic domain walls and reducing vibration-damping effectiveness.
Innovation Solution
A Fe—Al-based alloy vibration-damping component with an average crystal grain size ranging from 700 μm to 2000 μm and a sectional defect rate of less than 0.1%, manufactured using a method that involves melting and solidifying metal powder with a scanning rate of 700 mm/s to 1700 mm/s and subsequent annealing at 800 to 1200°C, resulting in an irregular sectional shape and improved vibration-damping characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If additive manufacturing method with rapid melting and solidification is used, then design freedom and complex shape capability are improved, but minute defects and inclusions are generated that hinder magnetic domain wall movement
Solution Approach 1:
The patent changes the scanning rate parameter to a specific range (700-1700 mm/s) to control the solidification process. This parameter adjustment optimizes the balance between maintaining design freedom of additive manufacturing and reducing defects that would harm vibration-damping performance
Solution Approach 2:
The patent utilizes controlled phase transitions during additive manufacturing by managing the melting and solidification processes. The specific scanning rate controls the phase transition speed, enabling complex shape fabrication while minimizing harmful solidification defects
2Reliability
If crystal grain size is increased to enhance magnetostriction and vibration-damping, then vibration-damping effect is improved, but cold workability and strength are reduced
Solution Approach 1:
The patent establishes a specific crystal grain size range (300-700 μm) that optimizes the trade-off between vibration-damping effect and mechanical strength. This parameter range allows sufficient magnetostriction for good damping while maintaining adequate strength for structural applications
Solution Approach 2:
The patent combines the benefits of both fine and coarse grain structures by controlling the additive manufacturing process to produce a mixed grain size distribution, copying the advantageous features of both grain size regimes
3Reliability
If scanning rate is decreased to reduce defects, then solidification quality is improved, but productivity is reduced
Solution Approach 1:
The patent identifies an optimal scanning rate range (700-1700 mm/s) that balances solidification quality and manufacturing efficiency. This parameter optimization ensures acceptable defect levels while maintaining practical productivity for industrial application
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 approach results in a component with few solidification defects, maintaining or enhancing vibration-damping characteristics despite minute defects, and achieving ductility and strength comparable to conventionally plastic-worked products.
Implementation Method 1
a shaping step in which metal powder including 4.0 to 12.0% by mass of Al with the balance being Fe and inevitable impurities is melted and solidified using a heat source with a scanning rate set to 700 mm/s to 1700 mm/s
Implementation Method 2
an annealing step in which the shaped product is annealed at a temperature of 800 to 1200° C.
Implementation Method 3
A magnetic domain wall in the material is moved by the magnetostriction corresponding to the magnitude of a strain caused by vibration, and thereby an elastic energy of the vibration is absorbed
Data Source
AI summary
Provided is a Fe—Al-based alloy vibration-damping component including 4.0 to 12.0% by mass of Al with the balance being Fe and inevitable impurities, having an average crystal grain size in the range of over 700 μm to 2,000 μm and a sectional defect rate of lower than 0.1%, and having an irregular sectional shape. Also provided is a method for manufacturing a Fe—Al-based alloy vibration-damping component. The method obtains a vibration-damping component having an irregular sectional shape, and includes a shaping step in which metal powder including 4.0 to 12.0% by mass of Al with the balance being Fe and inevitable impurities is melted and solidified using a heat source with a scanning rate set to 700 to 1700 mm/second to obtain a shaped product and an annealing step in which the shaped product is annealed at a temperature of 800 to 1200° C.