Abstract
Laser-alloyed layer with boron and CaF2 self-lubricating addition was produced on 100CrMnSi6-4 bearing steel. The produced layer was free of cracks or gas pores and uniform in respect of the thickness because of the high overlapping (86%). The microstructure consisted of re-melted zone and heat-affected zone. The re-melted zone included dendritic or globular iron borides with limited percentage of eutectic mixture in which CaF2 particles were located. Martensite and retained austenite occurred in heat-affected zone. Tribofilm, consisting of CaF2, was observed on the worn surface and was the reason for improved wear resistance compared to the laser-alloyed layer with boron only. In areas, in which tribofilm was thin or almost invisible, an intensive abrasive or oxidative wear proceeded.
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