- Descrição
Placa de sobreposição: Wear Resistance Mechanism of Hardfaced Weld Layers
Overlay plate (also called hardfaced plate or weld overlay wear plate) is a composite steel product that achieves high wear resistance by depositing a hard alloy layer onto a steel base plate through welding. Its excellent performance does not come from the base steel, but from the metallurgical structure of the overlay layer.
The wear resistance mechanism is mainly based on the interaction between hard carbides, alloy matrix, and surface stress behavior.
1. Hard Carbide Reinforcement Mechanism
| Elemento / Phase | Function in Wear Resistance |
|---|---|
| Carbonetos de cromo (CR7C3, Cr23C6) | Primary hard phase resisting abrasion |
| Carbono (C) | Forms carbide structures with chromium |
| Iron-based matrix | Supports and holds carbides in place |
| Elementos de liga (N.º, Mo, V) | Refines carbide distribution and improves stability |
The hard carbides act like “micro cutting tools” that resist scratching and cutting from abrasive particles.
2. Two-Phase Composite Wear Structure
The overlay layer is a dual-phase structure:
- Hard phase: Carbides (alta dureza, resist wear)
- Tough matrix: Metal binder (absorbs impact and holds structure)
This combination provides both hardness and limited toughness, which is essential for industrial wear conditions.
3. Abrasive Wear Resistance Mechanism
| Wear Type | How Overlay Layer Works |
|---|---|
| Abrasão deslizante | Carbides resist cutting and micro-scratching |
| Erosão de partículas | Hard surface reduces material loss from impact particles |
| Friction wear | Reduces surface deformation and groove formation |
4. Stress Distribution and Crack Behavior
Durante a soldagem, controlled micro-cracks may form on the surface:
- They help release residual stress
- They prevent large-scale fracture
- They do not reduce wear performance
This stress-relief behavior helps maintain long-term stability under heavy wear conditions.
5. Bonding Strength Mechanism
Overlay plates are not mechanically attached—they are ligado metalurgicamente.
- Strong fusion between overlay and base plate
- No delamination under normal working conditions
- Improved load transfer capability
6. Why Overlay Plates Last Longer Than Ordinary Steel
| Fator | Effect on Service Life |
|---|---|
| Alta dureza superficial | Reduces material loss rate |
| Reforço de carboneto | Prevents cutting wear |
| Composite structure | Balances wear resistance and toughness |
| Controlled alloy design | Improves stability in harsh conditions |
7. Teda Ganghua Overlay Plate Supply Capability
Como fornecedor profissional de aço resistente ao desgaste, Teda Ganghua provides high-performance overlay plates with optimized carbide structures for mining, cimento, aço, e indústrias de energia. We focus on improving wear resistance through controlled alloy design and stable welding processes.
We also support customized cutting, fabricação, and wear system engineering based on real working environments.
Explore nossos produtos de aço resistentes ao desgaste aqui:
Placa de sobreposição de carboneto de cromo
Conclusão
The wear resistance of overlay plates comes from hard carbide reinforcement, composite dual-phase structure, and metallurgical bonding. These mechanisms work together to significantly reduce material loss under abrasion, making overlay plates one of the most effective industrial wear solutions.
