- 描述
覆盖板: 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
| 元素 / Phase | 耐磨性能 |
|---|---|
| 碳化铬 (三价铬, Cr23C6) | Primary hard phase resisting abrasion |
| 碳 (C) | Forms carbide structures with chromium |
| Iron-based matrix | Supports and holds carbides in place |
| 合金元素 (铌, 莫, 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:
- 硬相: Carbides (高硬度, 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 |
|---|---|
| 滑动磨损 | Carbides resist cutting and micro-scratching |
| 颗粒侵蚀 | Hard surface reduces material loss from impact particles |
| Friction wear | Reduces surface deformation and groove formation |
4. Stress Distribution and Crack Behavior
焊接时, 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 冶金结合.
- 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
| 因素 | Effect on Service Life |
|---|---|
| 表面硬度高 | Reduces material loss rate |
| 硬质合金强化 | 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
作为专业耐磨钢供应商, Teda Ganghua provides high-performance overlay plates with optimized carbide structures for mining, 水泥, 钢, 和电力行业. We focus on improving wear resistance through controlled alloy design and stable welding processes.
We also support customized cutting, 制造, and wear system engineering based on real working environments.
在这里探索我们的耐磨钢产品:
碳化物覆盖板
结论
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.
