AbstractModelling and simulation of microstructural development is of increasing interest especially for the production of critical components for aeronautical applications such as turbine discs. In this paper a model is presented which can predict microstructural changes of nickel base Inconel 718 during hot forming by means of semi-empirical equations. To determine the necessary parameters for reliable prediction, hot compression tests were carried out in a temperature range of 950 to 1150°C for strain rates of 0·005 to 10 s−1. The measured data and the derived characteristic equations for the description of the hot deformation behaviour were incorporated into a finite element program and two industrial forging strategies for the production of turbine discs were simulated. The finite element program used was extended by a module to take the velocity characteristics of a counterblow hammer into account. Thus, a prediction of grain size evolution and recrystallised volume fraction during industrial hot wo...
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