Specific features of hydroabrasive wear of high chromium cast irons

The fracture mechanism (wear) of high-chromium cast irons in a hydroabrasive environment was studied. The grades of cast irons for parts which require mechanical cutting were determined. It is shown that the character of hydroabrasive wear of high-chromium cast irons depends on their chemical composition, structure, properties of the environment and is largely determined by the Rebinder’s effect, which enhances due to the presence of abrasive particles up to 1 m size (pulp). Different wear mechanisms of high-chromium cast irons with different content of carbon (carbides) and chromium are considered. During the surface fracture, along the dendritic structure, a flow of abrasive particles (pulp) is formed, which creates main cracks. It is found that high-chromium cast irons with a minimum carbon content (amount of carbides) demonstrate minimal mass loss in an environment with pulp. The high-chromium cast iron grades for cast parts are proposed, taking into account the conditions of manufacture and operation.