Forged Overlay Hard Particle Embedding for Wear Resistance
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Solution Overview
Problem
Machine components with overlays containing hard particles dispersed in a matrix suffer from wear resistance deterioration due to the hard particles falling off during use.
Innovation Solution
A machine component with a forged overlay surface where hard particles are embedded side by side within an average particle diameter from the surface, and protrusions at the interface with the base prevent the overlay from detaching, ensuring the hard particles remain embedded and enhancing wear resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If overlay with hard particles is formed by conventional welding method, then wear resistance is improved, but hard particles fall off during use causing deterioration in wear resistance
Solution Approach 1:
The invention changes the surface condition parameter of the overlay by forming a forged surface with specific roughness (Ra 1.6μm to 6.3μm) and controlling the embedding depth of hard particles (0.1 to 0.5 times average particle diameter). This parameter optimization ensures hard particles remain embedded during use, preventing fallout and maintaining wear resistance.
Solution Approach 2:
The invention creates a composite overlay structure consisting of a matrix material (steel or nickel-based alloy) combined with dispersed hard particles (carbide, oxide, or nitride). This composite structure provides both the toughness of the matrix and the wear resistance of the hard particles, while the controlled embedding prevents particle fallout.
2Stability of the object's composition
If hard particles are embedded deeply in the overlay, then particle retention is improved, but manufacturing complexity increases
Solution Approach 1:
The invention optimizes the embedding depth parameter to be 0.1 to 0.5 times the average particle diameter, which is sufficient to prevent fallout without requiring excessive embedding. The surface roughness is controlled within Ra 1.6μm to 6.3μm, providing an optimal balance between particle retention and manufacturing feasibility.
3Ease of manufacture
If overlay surface is made smooth, then manufacturing ease is improved, but hard particle embedding is insufficient causing particle fallout
Solution Approach 1:
The invention specifies an optimal surface roughness range of Ra 1.6μm to 6.3μm, which is not perfectly smooth but provides sufficient mechanical interlocking for hard particle retention. This roughness can be achieved through conventional forging or surface treatment methods, balancing manufacturing ease with particle embedding effectiveness.
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 solution effectively prevents hard particles from falling off, thereby improving the wear resistance of machine components, making them suitable for high-wear applications like tracked undercarriages, bucket teeth, and crusher teeth.
Implementation Method 1
The hard particles located in an overlay surface region are arranged side by side while being embedded in the overlay
Implementation Method 2
in a region including an interface between the overlay and the base, the overlay includes a protrusion that protrudes toward the base
Data Source
AI summary
A sprocket wheel, which is an example of the machine component, includes a base made of a first metal, and an overlay disposed in contact with the base to cover at least a part of a surface of the base. The overlay includes a matrix made of a second metal, and hard particles dispersed in the matrix. The surface of the overlay is a forged surface. The hard particles located in an overlay surface region within an average particle diameter of the hard particles from the surface of the overlay are arranged side by side while being embedded in the overlay.