engleski

Influence of dominant mechanism and Dimensional criterion of seizure on the Choice of wear protection procedure

Some characteristic examples, with the components worn by the abrasion and fatigue of the surface layer, were chosen. The analysis of structure, wear marks and hardness measurement were conducted on the components with clad layers. It was found that the abrasion influences on a decrease of installed capacity efficiency as the result of pronounced local damage of components due to wear, and that the fatigue results in seizure of components and losses due to seizure. The possible causes could be in the type and distribution of carbides and the matrix of clad layers. By introducing a dimensional criterion of seizure of components, the preconditions for investigating the possibilities of using the carbonitrided layers were created. Considering the properties of samples achieved by the high temperature carbonitriding with a variable C and N potential, some advantages of its use on the components with the dimensional criterion of seizure up to 0, 2 ev. 0, 3 mm were emphasized. It was concluded that the cladding of protective layers is recommended in the cases where the dimensional criterion of seizure is a few millimetres with the condition that carbides/carbonitrides are distributed as evenly as possible in the tough matrix. The high temperature carbonitriding, with a variable C and N potential, is recommended for the conditions where the dimensional criterion of seizure is up to 0, 3 mm.

dominant wear mechanism; dimensional criterion of seizure; wear protection

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