Discussion on metal wear-resistant materials
There is no universal wear-resistant material in the world. As the saying goes, the best is the one that is suitable. There are many types of wear-resistant materials, and it sounds like a lot. As a user, how to choose and use wear-resistant materials is also a science.
First of all, hardness is an important index to distinguish grinding bodies. After strict quenching, the grinding bodies have good wear resistance only when the HRC hardness reaches 58 or more. However, the hardness of wear-resistant materials is not as high as possible. Some working conditions Under the condition of high hardness, it is easy to cause the initiation of microcracks. Since the wear process is a complex process of multi-factor interaction, it is not only related to the characteristics of the grinding body's own material, but also related to the friction form, surface state, and service conditions (such as pressure and temperature, etc.).
When choosing a grinding body, it should be considered according to the working conditions of the grinding body. For example, for the abrasive wear of the micro-cutting mechanism, increasing the hardness of the wear-resistant casting is conducive to the improvement of wear resistance; for the fatigue spalling mechanism In terms of abrasive wear, the combination of high hardness of wear-resistant materials (castings) and good plasticity and toughness, especially in combination with good fracture toughness, low crack growth rate and high impact fatigue resistance, is beneficial to wear resistance. Improved abrasiveness.
Principles of wear-resistant material selection
Fatigue wear: For fatigue wear, it should be considered to have better organizational continuity and crack growth resistance.
Abrasive wear: It is necessary to choose a material with high hardness to improve wear resistance. In the case of a large impact, first consider the toughness, and then consider its hardness.
Corrosive wear: In general, the good corrosion performance of wear-resistant materials should be considered first.
