Modelling of cutting induced surface phase transformations considering friction effects

Depending on machining process, machined material, cutting and tool parameters as well as the resulting heating and cooling rates the heat in cutting processes can lead to phase transformations in the work piece surface layer. This paper presents an approach to predict and analyze cutting induced phase transformations in surface layers. Therefore a 2D-FE-cutting simulation model has been developed for the steel 42CrMo4 (AISI4140). The model includes remeshing for the material separation and a material model considering short time austenization and transformation plasticity. To verify the simulations and to determine necessary input data, orthogonal turning experiments are done and furthermore a laboratory tribometer is used to measure the friction coefficient of the sliding pair between the hard metal cutting tool (WC-6Co) and the steel as a function of sliding speed and temperature.