- Описание
Накладная пластина: 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
| Элемент / Phase | Функция износостойкости |
|---|---|
| Карбиды хрома (Кр7С3, Кр23С6) | Primary hard phase resisting abrasion |
| Углерод (С) | Forms carbide structures with chromium |
| Iron-based matrix | Supports and holds carbides in place |
| Легирующие элементы (Нб, Мо, В) | 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 (высокая твердость, 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 |
|---|---|
| Скользящее истирание | Carbides resist cutting and micro-scratching |
| Эрозия частиц | Hard surface reduces material loss from impact particles |
| Friction wear | Reduces surface deformation and groove formation |
4. Stress Distribution and Crack Behavior
Во время сварки, 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 металлургически связанный.
- Strong fusion between overlay and base plate
- Отсутствие расслаивания при нормальных условиях работы
- Improved load transfer capability
6. Why Overlay Plates Last Longer Than Ordinary Steel
| Фактор | Effect on Service Life |
|---|---|
| Высокая твердость поверхности | Reduces material loss rate |
| Карбидное армирование | 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
Как профессиональный поставщик износостойкой стали, Теда Ганхуа provides high-performance overlay plates with optimized carbide structures for mining, цемент, сталь, и энергетическая отрасль. We focus on improving wear resistance through controlled alloy design and stable welding processes.
Мы также поддерживаем индивидуальную резку, изготовление, and wear system engineering based on real working environments.
Ознакомьтесь с нашей продукцией из износостойкой стали здесь:
Хромий карбид накладка
Заключение
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.
