Wear of Mo- and W-alloyed TiAlN coatings during high-speed turning of stainless steel

This study investigates the wear of W- and Mo-alloyed Ti1-x-yAlxMeyN coatings (Me = W, Mo) with x asymptotic to 0.55 and y asymptotic to 0.10 during high-speed turning of stainless steel 316L. A difference in the crater wear rate was observed between TiAlN and Ti1-x-yAlxMeyN coatings. The wear behavior in the sliding area is characterized in detail for two different regions by scanning and transmission electron microscopy and energy dispersive X-ray spectroscopy. A thin adhered layer constituted of elements from the workpiece material is observed on the top of all coatings, followed by diffusion of species from the stainless steel 316L into the coatings. Co from the cemented carbide substrate also diffuses through column boundaries of the coating. The temperature varies in the sliding area. The presence of Mo or W retards the spinodal decomposition and the formation of h-AlN as compared to TiAlN coatings, leading to lower crater wear rate in alloyed coatings.

Automated summary

This study investigates the wear behavior of W- and Mo-alloyed Ti1-x-yAlxMeyN coatings during high-speed turning of stainless steel 316L, and finds that the crater wear rate of alloyed coatings is lower. The wear behavior in the sliding area is characterized in detail using microscopy and spectroscopy techniques.