Investigation of the Wear Behavior of Forging Tool by Ball on Disc and Impact Sliding Tribometer

DIN 1.2714 steel is frequently used as a die material in forging applications. The dies used in the forging process are exposed to both impact and sliding effect during the manufacturing. Therefore, the wear tests of such tools will be possible with a setup that can reflect the process with quantitatively identical resemblance on a laboratory scale. Accordingly, the differences in terms of wear mechanism between the impact sliding wear test setup designed by our team and the conventional ball disc wear setup were evaluated. Moreover, DIN 1.2714 steels are coated with an innovative (TiCrNb-hBN) PVD layer using a high impulse closed field unbalanced magnetron sputtering method to improve their wear performance. Structural investigations of coatings were evaluated using Scanning electron microscope. It was observed that the coatings grown on the surface in granular and columnar structure. Hardness and adhesion strength values were determined by microhardness and scratch tests, respectively. Hardness value of the steel has been increased by approximately 90% owing to TiCrNb-hBN layer. In the wear tests of the specimens under different principles, distinctly different wear mechanisms occurred. While plastic deformation, flaking and groove mechanisms were dominant in impact sliding wear, adhesive and abrasive wear showed itself in ball on disc. It has been demonstrated that the impact sliding wear assembly can better reflect the forging process.