The cavitation damage of the slurry pump is mainly reflected in the damage to the flow parts. Therefore, the material properties of the overflow will also affect the cavitation of the centrifugal pump to a certain extent. Using materials with good cavitation resistance to make the overflow parts is an effective measure to reduce the impact of cavitation on the centrifugal pump.
Material hardness: Taking the impeller made of AISI304 as an example, cavitation will cause work hardening of the impeller material and phase change induced martensitic steel. This change will in turn prevent further cavitation of the material. The cavitation corrosion resistance of work hardening and phase transformation induced martensite steel mainly depends on the hardness of the impeller material.
Work hardening and fatigue resistance: The higher the work hardening index of the material, the better the fatigue resistance, and the better the cavitation resistance of the material.
Influence of crystal structure: When other conditions are determined, the anti-cavitation rate is a function of the crystal structure. In the cubic crystal system, because the metal with a body-centered cubic lattice has a high strain rate sensitivity, when the strain rate increases, it will cause rapid transgranular brittle fracture and cleavage fracture, which will lead to the formation of pitting corrosion, resulting in greater Large abrasion rate.