Additive Manufacturing Melt Pool Control for Low-Segregation Superalloys

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Solution Overview

Problem

Conventional manufacturing processes like ESR and VAR lead to chemical segregation of heavy elements in molybdenum-containing superalloys, resulting in non-uniform microstructures and mechanical properties, which are undesirable for applications requiring uniform performance.

Innovation Solution

Utilizing additive manufacturing (AM) techniques to create a plurality of shallow melt pools instead of a single deep melt pool, reducing the segregation of heavy elements like molybdenum in superalloys by employing processes such as laser beam or electron beam powder bed fusion, and direct energy deposition.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If conventional consumable electrode remelting processes (ESR/VAR) are used to manufacture molybdenum-containing superalloys, then the manufacturing process is well-established and relatively simple, but chemical segregation of heavy elements occurs resulting in non-uniform microstructures and mechanical properties

Engineering Contradiction:

Improveuniformity of microstructure and mechanical propertiesVSAvoidcomplexity of manufacturing process

Core Design Contradiction:

Manufacturing precisionVSEase of manufacture

Solution Approach 1:

The patent applies segmentation by dividing the manufacturing process into controlled additive layers rather than creating a single large melt pool. Each layer is deposited and solidified separately, preventing the chemical segregation that occurs in conventional bulk remelting processes. This layer-by-layer approach ensures uniform distribution of heavy elements like molybdenum throughout the component.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent changes key process parameters by transitioning from conventional remelting parameters to additive manufacturing parameters. This includes controlling melt pool size, cooling rates, and deposition parameters to prevent chemical segregation. The specific control of energy input, deposition rate, and layer thickness are parameter changes that achieve uniform microstructure while maintaining manufacturing feasibility.

Inventive Principle:

Principle #35Parameter changes

2Manufacturing precision

If additive manufacturing with controlled melt pools is used to reduce material segregation, then manufacturing precision and uniformity are improved, but the process complexity and programming requirements increase

Engineering Contradiction:

Improvereduction of material segregationVSAvoidprogramming complexity of AM apparatus

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent manages programming complexity by establishing specific parameter ranges for additive manufacturing processes. By defining controlled parameter windows for energy input, deposition rates, and layer thickness, the complex programming requirements are standardized into repeatable process specifications that achieve the desired reduction in material segregation.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If additive manufacturing is used to produce uniform microstructures, then the mechanical property consistency is improved, but the manufacturing time and process complexity increase

Engineering Contradiction:

Improveconsistency of mechanical propertiesVSAvoidmanufacturing time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent applies continuity by maintaining continuous or near-continuous additive manufacturing operations. The process minimizes interruptions and maintains steady-state deposition conditions, allowing uniform microstructure formation without excessive manufacturing time. This continuous action approach builds components layer-by-layer without the need for repeated conventional remelting cycles.

Inventive Principle:

Principle #20Continuity of useful action

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 AM method produces components with more uniform microstructures and mechanical properties, ensuring consistent performance across the part, suitable for critical applications like gas turbine components.

Implementation Method 1

employing processes such as laser beam or electron beam powder bed fusion

Methodology Applied

Scientific EffectLaser heating: Laser

Implementation Method 2

employing processes such as laser beam or electron beam powder bed fusion

Methodology Applied

Scientific EffectElectron beam heating: Electron Beam

Implementation Method 3

create a plurality of shallow melt pools instead of a single deep melt pool

Methodology Applied

Scientific EffectMelting and solidification: Melting

Data Source

PatentUS20260001133A1Additive manufacturing techniques to reduce chemical segregation

Publication Date: 2026.01.01 RTX CORP

AI summary

A method of making a component using additive manufacturing (AM) techniques that selecting an AM manufacturing process suitable for making the component; selecting a material for the component that is compatible with the AM manufacturing component; selecting and programming AM process steps into a selected AM apparatus; and building the component on the selected AM apparatus using the selected AM process steps. The AM process steps are selected to produce a plurality of melt pools that reduce material segregation in the finished part. The component exhibits reduced material segregation compared to making the material with a consumable electrode remelting process. The component made with AM techniques includes a region exhibiting reduced material segregation compared to making the material with a consumable electrode remelting process.