Optimization of the wear behavior of uncoated, TiN and AlTiN coated cold work tool steel 1.2379 using response surface methodology

In this study, the wear behavior of uncoated, TiN and AlTiN coated cold work tool steel 1.2379 which is widely used in the mold industry was investigated experimentally. Heat treatment was applied to the specimens, then TiN and AlTiN PVD coating process was performed. The wear tests were carried out at 0.5 m x s(-1) sliding speed, 5, 10 and 15 N loads and 120 m sliding distance by using reciprocating abrasion device. The microhardness was measured and metallographic tests of the samples were investigated by SEM and EDS analysis. In order to examine the effect of process parameters on wear results, a statistical method such as analysis of variance (ANOVA) was employed. A mathematical model was created by using regression analysis based on both linear model and quadratic model for predicted wear value. Process parameters were optimized using response surface methodology with desirability function analysis. It is observed that the uncoated specimens worn approximately two times more than AlTiN coated and one time more than TiN coated. In the SEM images and EDS analysis, it is seen that the coating is spread uniformly on the materials.