Metal Multiphase Material Local Melting Oxygen Control
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Solution Overview
Problem
Current methods for producing hard multiphase materials with high carbide content face challenges in achieving a balance between wear resistance and fracture toughness due to the presence of non-metallic inclusions and coarse carbides, which are detrimental to material properties like impact toughness and fatigue resistance.
Innovation Solution
A method involving local melting of metal powder in an oxygen-free environment using an energy beam to reduce oxygen content and control carbide size, resulting in a metallic multiphase material with carbides less than 20 μm in size and oxygen content below 30 ppm, allowing for the production of clean, high-carbide materials with improved toughness and wear resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high carbide content and coarse carbide size are used, then wear resistance is improved, but fracture toughness deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling carbide size (0.5-5 μm instead of coarse carbides) and oxygen content (<30 ppm), transforming the material properties to achieve both wear resistance and fracture toughness. The fine carbide dispersion combined with low oxygen content creates a microstructure that resists both wear and fracture.
Solution Approach 2:
The patent uses an inert atmosphere (oxygen-free environment) during the melting and solidification process to prevent oxidation and control carbide formation. This inert environment ensures that carbides form with controlled size and distribution, preventing the formation of coarse carbides that would reduce fracture toughness while maintaining wear resistance.
2Ease of manufacture
If conventional melting and solidification is used, then manufacturing simplicity is maintained, but carbide size becomes coarse and oxygen content increases
Solution Approach 1:
The patent changes the thermal processing parameters by using controlled melting and solidification cycles with specific temperature profiles and cooling rates. This controlled parameter change enables fine carbide formation (0.5-5 μm) and low oxygen content (<30 ppm) while maintaining a relatively simple manufacturing process.
Solution Approach 2:
The patent utilizes controlled phase transitions (melting and solidification) to control carbide formation. By managing the solidification process parameters, the patent achieves fine carbide dispersion and low oxygen content, transforming a simple melting process into a precision manufacturing method.
3Reliability
If high oxygen content is present, then material purity is reduced, but fracture toughness and fatigue resistance deteriorate
Solution Approach 1:
The patent employs an inert atmosphere (oxygen-free environment) during the melting and solidification process to prevent oxidation. This inert environment ensures oxygen content remains below 30 ppm, which is critical for achieving high fracture toughness and fatigue resistance while maintaining material purity.
Solution Approach 2:
The patent converts the potential harm of oxygen into a benefit by controlling the melting and solidification process in an oxygen-free environment. The low oxygen content (<30 ppm) that results from this process becomes a key factor in achieving high fracture toughness and fatigue resistance, turning a potential defect into a strength.
4Strength
If fine carbide size is achieved, then fracture toughness is improved, but wear resistance may be compromised
Solution Approach 1:
The patent optimizes the parameter combination of carbide size (0.5-5 μm) and oxygen content (<30 ppm) to achieve both fracture toughness and wear resistance. This specific parameter range creates a microstructure where fine carbides provide toughness while the low oxygen content ensures proper carbide distribution and matrix quality for wear resistance.
Solution Approach 2:
The patent creates a composite microstructure with fine carbides dispersed in a low-oxygen metal matrix. This composite structure combines the benefits of fine carbides (fracture toughness) with the advantages of a clean matrix (wear resistance), achieving both properties simultaneously.
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 approach enables the production of materials with enhanced fracture toughness and wear resistance by limiting carbide growth and reducing oxygen content, facilitating the creation of complex geometries and improving material purity, while minimizing tool wear and energy consumption in machining.
Implementation Method 1
The powder of the initial metallic multiphase material is locally melted in a first portion by exposing the first portion of the powder of the initial metallic multiphase material to an energy beam
Implementation Method 2
The local melting allows at least a part of an oxygen content of the melted initial metallic multiphase material to react with carbon of the melted initial metallic multiphase material into oxides of carbon
Implementation Method 3
exposing the first portion of the powder of the initial metallic multiphase material to an energy beam
Data Source
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Figure 1B
Figure 2
AI summary
A method for manufacturing of a metallic multiphase material comprises providing (210) of a powder of an initial metallic multiphase material. The material comprises a metal matrix in which carbides are embedded. The material has a carbon content over 0.6 % by weight. The powder is placed (220) in an oxygen-free environment and melted (230) locally in a first portion by exposing the first portion of the powder of the initial metallic multiphase material to an energy beam during a first time period. The local melting allowing at least a part of an oxygen content of the melted initial metallic multiphase material to react with carbon of the melted initial metallic multiphase material into oxides of carbon. This gives a final metallic multiphase material in the first portion that has an oxygen content less than 50 ppm by weight. The final metallic multiphase material is solidified (240).