Abstract
This work reports on the machinability differentiation in semi finishing of three carburizing steel grades that are used in transmission components such as gears, crown wheels and pinions. A reference steel grade of type 20NiCrMo was compared with a clean steel (S=40ppm) and an ultra-clean steel (S=10ppm). Attention is on the link between the characteristics of the non-metallic inclusions of the steel grades and the balance of the flank and rake face wear of the CVD Al2O3 and TiCN coatings. The interaction of abrasive wear and thermo-mechanical degradation of the Al2O3 upper layer will be described.
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