1. Wear failure
Wear failure is the main method of failure of all metal surfaces such as wear-resistant castings, especially in strong abrasive wear, the wear-resistant steel is gradually worn and eventually fails. The hardness of wear-resistant steel is an important factor affecting its wear.
Generally speaking, the hardness of the wear-resistant part is more than 1 times higher than the hardness of the material in order to obtain better wear resistance. The hardness is the hardness of the working surface of the wear-resistant part after wear rather than the initial hardness before wear. But it is not that the higher the hardness, the better, because the higher the hardness, the more brittle the wear parts are and the easier it is to break.
2. Fracture failure
The fracture of the wear-resistant part is often caused by a greater impact during its use. If the wear-resistant part is improperly installed, such as when the liner is installed, the back and the cylinder are not in contact with the surface but in partial contact, which is very easy to cause fracture. To improve the impact and toughness of wear-resistant parts, reducing the crack growth rate will be beneficial to fracture resistance. At present, surfacing-type wear-resistant materials have replaced wear-resistant casting products
3. Deformation failure:
Deformation failure is the low yield strength of wear-resistant parts, so that severe macroscopic plastic deformation occurs due to external force during use, and the shape of the casting changes and fails. Failures are more common in wear-resistant manganese steel parts with low yield strength, such as high-impact ball mill working conditions. The severe reverse bow deformation of the manganese steel liner can break the bolt or cause the liner to shift and fall off.
