Scientific paper ID 2305 : 2022/3

The present study aims to create a methodology for decision making in the process of designing the regime of the technological process of ion nitriding. The methodology is applied about the relative degree of wear Kv for grade tool steels for hot working BH10, BH11 and BH21 and thus the stages of its application are demonstrated. Main procedures such as Design of Experiment, single and multi-criteria optimization are used. With the help of the numerical methodology the tendency in the change is determined for establishing technological regimes and modeling properties of wear, which are finally clarified by nitride zone forming the layer. Since similar steels are analyzed in the study, the general treatment regime is established, which leads to the desired relative wear resistance. The result of the study is obtaining accurate values for the relative degree of wear Kv and their corresponding regimes for the three tested steels. A general range is determined for the whole grade, through the stages of the applied methodology, in which the steels have high wear resistance.