Modelling and Analysis of Tool Wear on a Cryogenically Treated Cnmg120408smrh13a Insert in the Turning of Aisi4340 Steel Using Response Surface Methodology

The aim of this study is the modelling and analysis of tool wear on cryogenically treated CNMG120408SMRH13A inserts. Cryogenic treatment is carried out at -196°C for 48 hours, followed by tempering at 200°C for 2 hours. The AISI4340 steel is machined with cryogenically treated inserts by the turning process. Parameters, namely cutting speed, feed rate, and depth of cut, are selected as the input parameters at three levels. The flank and the crater wear are considered as output responses. The Scanning Electron Microscope (SEM) and X-Ray Diffraction analyses (XRD) confirm the formation of η-phase carbides on the treated surfaces. It is found that the results obtained from this model are sufficiently accurate for the prediction of tool wear. A good correlation is shown between the theoretical predictions and the experimental data. Direct and interaction effects of process parameters on the responses are studied by plotting graphs. As a result, it is found that cryogenically treated inserts have superior tool wear resistance, which has been confirmed by conducting confirmation tests.