Layered Single-Crystal Manufacturing with Precise Orientation Control
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Solution Overview
Problem
Conventional methods for producing single crystals, such as the Bridgman method, lack precision in adjusting crystal orientation, leading to deviations in the desired crystal orientation during solidification, which affects the quality of the produced single crystals.
Innovation Solution
A method involving thermomechanically activated successive anisotropic plastic deformation is used to produce single crystals by heating and melting metallic material in a linear region, allowing for precise adjustment of crystal orientation through mechanical stresses generated by controlling the extension direction, speed, and temperature of the melted region, enabling precise control over primary and secondary crystal orientations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional methods like Bridgman method are used for single crystal production, then the production process is established and can produce single crystals, but the crystal orientation precision is insufficient with deviations of a few degrees from desired orientation
Solution Approach 1:
The invention changes the parameters of the melting process by controlling the movement speed, temperature, and extension direction of the linear melting region. By adjusting these parameters, the mechanical stresses during solidification are controlled to achieve precise crystal orientation (within 0.1 degrees) without requiring complex additional equipment beyond the additive manufacturing system.
2Manufacturing precision
If Bridgman method with spiral selector is used, then grain selection is achieved, but the secondary crystal orientation cannot be influenced and remains random
Solution Approach 1:
The invention replaces the mechanical spiral selector system with a thermomechanical field-based approach. By controlling the linear melting region's movement and temperature parameters, both primary and secondary crystal orientations are determined through the direction and magnitude of mechanical stresses during solidification, eliminating the need for geometric selectors and achieving precise control of all orientation components.
3Manufacturing precision
If additive manufacturing with linear region melting is used, then precise crystal orientation can be achieved, but the process requires precise control of extension direction, speed and temperature parameters
Solution Approach 1:
The additive manufacturing system performs multiple functions simultaneously: it melts the material, controls the thermal field, generates mechanical stresses through controlled solidification, and determines crystal orientation all in one integrated process. The linear melting region's parameters are controlled through the existing additive manufacturing software and hardware, eliminating the need for separate orientation control systems.
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 improves the quality of single crystals by allowing precise adjustment of crystal orientation, enhancing the production of single crystals with controlled orientations, suitable for high-temperature applications and components like turbine blades.
Implementation Method 1
The metallic material is heated during the construction of a new layer, with the result that the metallic material is melted in a linear region
Implementation Method 2
During heating, in particular melting, and subsequent cooling, in particular solidification, thermal expansions can occur, which cause the mechanical stresses
Implementation Method 3
subsequent cooling, in particular solidification
Data Source
AI summary
The invention relates to a method for producing a component by means of layered construction, by combining a plurality of crystallites of a metallic material to form a single crystal. The single crystal is formed by thermomechanically activated successive anisotropic plastic deformation. The metallic material is heated during the construction of a new layer, with the result that the metallic material is melted in a linear region. The linear region is moved in order to construct the new layer.