| 摘要 |
The present invention relates to a coated cemented carbide insert (cutting tool), particularly useful for milling of stainless steels and super alloys but also milling of steels in toughness demanding applications. The cutting tool insert is characterised by a cemented carbide body comprising WC, NbC and TaC, a W-alloyed Co binder phase, and a coating comprising an innermost layer of TiC<SUB>x</SUB>N<SUB>y</SUB>O<SUB>z </SUB>with equiaxed grains, a layer of TiC<SUB>x</SUB>N<SUB>y</SUB>O<SUB>z </SUB>with columnar grains and a layer of alpha-Al<SUB>2</SUB>O<SUB>3</SUB>. |
