Enhancing cutting performance of micro-textured and coated tool by synergistically improving coating adhesion strength and debris capture-storage capacities

Abstract

A TiAlN-coating with laser-induced depth-graded micro-textured substrate was produced by combination of ultra-fast laser and vacuum cathodic arc. The depth-graded micro-textures (DGMTs) with gradual changes in depth improve synergistically coating adhesion strength and debris capture-storage capacities, showing a better adaptability with TiAlN coating as compared to the single-scale MTs with a same size. In addition, the DGMTs can produce additional cuttings on wear counterpart, obtaining a higher material removal rate. The DGMTs parallel to and vertical to the main cutting edge (named as DGMTs-P and DGMTs-V, respectively) on flank face were carried out to high-speed dry cut precipitation hardening stainless steel. The tool lifespan are: TiAlN＜TiAlN/DGMTs-P＜TiAlN/DGMTs-V. The wear mechanisms for the TiAlN/DGMTs tools are shown.