Electron Beam Atomization for Nickel-Base Superalloy Preforms
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Solution Overview
Problem
Conventional alloy production techniques, such as cast-and-wrought metallurgy and powder metallurgy, face challenges in producing nickel-base superalloys with fine-grained microstructures, homogeneity, and low segregation, leading to defects like freckles and voids, which are detrimental to critical engineering applications.
Innovation Solution
A solid-spray-forming process involving the production of a stream of molten alloy, electron beam atomization, and acceleration of electrically-charged particles within electrostatic and electromagnetic fields to achieve solidification and bonding on a substrate, reducing segregation and porosity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional cast-and-wrought alloy production processes are used, then the production process is relatively simple, but the alloy cannot achieve fine-grained microstructures and homogeneous composition
Solution Approach 1:
The patent replaces conventional mechanical casting and working processes with an electron beam-based atomization and deposition system. Electrons are used to melt, atomize, and re-deposit alloy material, enabling fine-grained microstructure formation without traditional mechanical processing
Solution Approach 2:
The patent changes the fundamental processing parameters by using electron beam energy density, electron current, and controlled deposition conditions to achieve fine-grained microstructures. The rapid cooling rates and controlled solidification parameters enable microstructure control unattainable by conventional methods
2Manufacturing precision
If powder metallurgy processes are used to achieve fine-grained microstructures, then fine-grained microstructures can be produced, but the process complexity increases and voids and porosity are introduced
Solution Approach 1:
The patent replaces powder metallurgy's mechanical powder handling and consolidation processes with direct electron beam-based material deposition. This eliminates the need for powder compaction and sintering operations that create voids and porosity
Solution Approach 2:
The patent extracts and eliminates the intermediate powder handling steps from the manufacturing process. By directly depositing atomized material in a controlled environment, the process removes the source of voids and porosity inherent in powder metallurgy
3Manufacturing precision
If powder metallurgy processes are used, then fine-grained microstructures can be achieved, but impurities and contaminants are introduced during powder production and handling
Solution Approach 1:
The patent employs an inert or vacuum environment for the electron beam processing and material deposition. This controlled atmosphere prevents oxidation and contamination of the molten and atomized material, eliminating impurity introduction during processing
Solution Approach 2:
The patent replaces mechanical powder handling operations with electron beam-based direct deposition. This eliminates contact with processing equipment and environment that would otherwise introduce impurities and contaminants
4Ease of manufacture
If conventional alloy production techniques are used, then the production process is straightforward, but segregation and defects like freckles occur
Solution Approach 1:
The patent replaces conventional melting and casting mechanics with electron beam-based atomization and deposition. This enables precise control over material placement and composition, preventing segregation and freckle formation
Solution Approach 2:
The patent maintains continuous material flow and deposition without interruption or re-melting cycles. This continuous process prevents the thermal gradients and solidification issues that cause segregation and compositional inhomogeneity
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 process enables the production of premium quality nickel-base superalloy preforms with fine-grained microstructures and high density, minimizing segregation and defects, suitable for critical applications like turbine components.
Implementation Method 1
Electrically-charged particles of the molten alloy are produced by impinging electrons on at least one of the stream of molten alloy and the series of droplets of molten alloy to atomize the molten alloy
Implementation Method 2
The electrically-charged molten alloy particles are accelerated with at least one of an electrostatic field and an electromagnetic field
Implementation Method 3
The electrically-charged molten alloy particles are accelerated with at least one of an electrostatic field and an electromagnetic field
Implementation Method 4
The molten alloy particles are cooled to a temperature less than a solidus temperature of the molten alloy particles so that the molten alloy particles solidify while accelerating
Data Source
AI summary
Processes, systems, and apparatuses are disclosed for forming products from atomized metals and alloys. A stream of molten alloy and/or a series of droplets of molten alloy are produced. The molten alloy is atomized to produce electrically-charged particles of the molten alloy by impinging electrons on the stream of molten alloy and/or the series of droplets of molten alloy. The electrically-charged molten alloy particles are accelerated with at least one of an electrostatic field and an electromagnetic field. The accelerating molten alloy particles are cooled to a temperature that is less than a solidus temperature of the molten alloy particles so that the molten alloy particles solidify while accelerating. The solid alloy particles are impacted onto a substrate and the impacting particles deform and metallurgically bond to the substrate to produce a solid alloy preform.