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오버레이 플레이트: 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
| 요소 / Phase | Function in Wear Resistance |
|---|---|
| 크롬 탄화물 (Cr7C3, Cr23C6) | Primary hard phase resisting abrasion |
| 탄소 (기음) | Forms carbide structures with chromium |
| Iron-based matrix | Supports and holds carbides in place |
| 합금 원소 (NB, 모, 다섯) | 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 (높은 경도, 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 |
|---|---|
| 슬라이딩 마모 | Carbides resist cutting and micro-scratching |
| 입자 침식 | Hard surface reduces material loss from impact particles |
| Friction wear | Reduces surface deformation and groove formation |
4. Stress Distribution and Crack Behavior
용접 중, 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 야금학적으로 결합된.
- Strong fusion between overlay and base plate
- 정상적인 작업 조건에서 박리 없음
- Improved load transfer capability
6. Why Overlay Plates Last Longer Than Ordinary Steel
| 요인 | Effect on Service Life |
|---|---|
| 높은 표면 경도 | Reduces material loss rate |
| 초경보강 | 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
전문적인 내마모성 강철 공급업체로서, 테다강화 provides high-performance overlay plates with optimized carbide structures for mining, 시멘트, 강철, 및 전력 산업. We focus on improving wear resistance through controlled alloy design and stable welding processes.
맞춤형 커팅도 지원합니다, 제작, and wear system engineering based on real working environments.
여기에서 내마모성 강철 제품을 살펴보세요.:
크롬 카바이드 오버레이 플레이트
결론
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.
