The role of modification processes in ledeburitic class cast steel tribological properties

The work focuses on tribological tests of G200CrNiMo4-3-3 cast steel in the state without modification as well as after modification with FeSi and FeB. The FeSi modification reduced the secondary cementite precipitation in the Widmanstätten pattern and the FeB modification eliminated it. The increase in hardness and the reduction of the cementite content in the Widmanstätten pattern obtained as a result of the modification did not increase abrasion resistance. The FeSi modification resulted in an increase of the mean friction coefficient.
The obtained test results point to the fact that the modification process itself (limiting the amount of the secondary cementite precipitations) is not sufficient to improve tribological properties. It seems necessary to apply (beside modification) also heat treatment resulting in secondary cementite precipitation in the area of primary austenite grain.

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