Additive Manufacturing Hot-Cracking Evaluation Under Controlled Tension
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Solution Overview
Problem
Existing methods for evaluating hot cracking in additive manufacturing are inconsistent, labor-intensive, and prone to missing small cracks, making it difficult to determine the susceptibility of hot cracking in additive manufacturing processes.
Innovation Solution
A device and method involving a deposition device, base, connection arrangements, and a central processing unit to control the deposition and pulling of material layers on a substrate, allowing for controlled variation of parameters to evaluate hot cracking susceptibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If samples are cut, polished and etched to examine fracture surfaces, then hot cracking detection is attempted, but small cracks are difficult to open up and confirm, leading to missed detections
Solution Approach 1:
The patent applies preliminary action by pre-processing the substrate surface through roughening or coating with a contrasting material before deposition. This creates enhanced surface characteristics that make subsequent crack detection easier, as cracks will be visible against the roughened or contrasting background without requiring extensive post-processing examination
Solution Approach 2:
The patent utilizes color changes by applying a coating material with contrasting optical properties to the substrate before deposition. This contrast makes cracks visually detectable through optical methods, transforming the detection problem from one requiring physical sectioning to one solvable through optical inspection
2Reliability
If multiple samples are tested to determine hot cracking susceptibility, then evaluation data is obtained, but the process is labor-intensive and inconsistent
Solution Approach 1:
The patent establishes a universal evaluation method that can be applied consistently across different additive manufacturing processes and materials. The standardized procedure involving substrate preparation, controlled deposition parameters, and systematic examination creates a repeatable protocol that reduces variability and labor intensity while maintaining reliability
Solution Approach 2:
The patent systematically varies deposition parameters such as deposition rate, layer thickness, and thermal conditions to evaluate their effect on hot cracking susceptibility. This controlled parameter variation approach enables consistent comparison across different process conditions while reducing the need for extensive manual testing
3Manufacturing precision
If the substrate is heated to elevated temperature before deposition, then hot cracking evaluation is improved, but the process complexity increases
Solution Approach 1:
The patent applies preliminary heating to the substrate before material deposition to simulate service conditions and enhance the detection of hot cracking susceptibility. This pre-heating step is integrated into the evaluation protocol, allowing accurate assessment of cracking behavior under thermally elevated conditions without requiring excessively complex equipment
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
Provides a consistent, repeatable, and cost-effective method for evaluating hot cracking susceptibility by systematically varying deposition parameters and analyzing resulting layers for cracks, enabling the determination of optimal manufacturing conditions.
Implementation Method 1
additive manufacturing is a process whereby a three-dimensional object is created by depositing successive layers of a melted or partially-melted material
Implementation Method 2
Each layer bonds to a preceding layer of the melted or partially-melted material as the melted or partially-melted material cures, thereby fusing the layers together
Implementation Method 3
A drive mechanism is operatively connected to one of the base and the deposition device and is configured to axially move the one of the base and the deposition device in a first direction at a speed as the layer of material is being deposited
Implementation Method 4
The puller mechanism pulls the second connection arrangement away from the first connection arrangement
Implementation Method 5
heating the substrate to an elevated temperature prior to the step of depositing the layer of material on the substrate
Data Source
AI summary
A device and method are provided for evaluating the susceptibility of hot cracking in an additive manufacturing process. A first end of a substrate is interconnected to a base and one of the base and a deposition device is moved in a first direction and the second end of the substrate is pulled. A powder is dispensed at a selected rate and an energy bean having an adjustable power density is direct at the powder to melt the powder to form a material which is deposited as a layer of a material on the substrate. During the deposition process or during the deposition of the material on a subsequent substrate, one or more parameters/conditions are varied to determine the point at which hot cracking occurs during the deposition process.