Aluminium-alloy transfer to a CrN coating and a hot-work tool steel at room and elevated temperatures
Jerina, Jure ; Kalin, Mitjan
During the processes of forming aluminium alloys, adhesion, and in particular the formation of the aluminium-alloy transfer on the bearing surface of the die, is one of the main reasons for the ...failure of tools and the poor surface quality of products. The present work was focused on the transfer initiation of an aluminium alloy (EN AW-6060) and its evolution on a coated (CrN) and an uncoated, nitrided hot-work tool steel (AISI H13) at temperatures from room temperature to 500 °C. The contact was investigated in terms of the transferred aluminium alloy surface area size on the uncoated and coated tool-steel surfaces, the topography of the wear trace and the corresponding change in the coefficient of friction. The results show the strong dependence of the tribological properties of the hot-work tool steel and the CrN coating with respect to the aluminium alloy for the temperature together with a limited dependence on the sliding distance. At 20 °C the surface roughness was found to be the main initial cause of the aluminium alloy%s transfer via mechanical interlocking. At higher temperatures (400 °C), this transfer occurred predominantly due to strong adhesion. However, at the highest tested temperature (500 °C) the CrN coating showed a notable decrease of the adhesion with a consequent reduction in the transfer of the aluminium alloy and limited transfer-film formation.
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