Analysis of material response to ultrasonic vibration loading in turning Inconel 718

Analysis of ultrasonic-assisted drilling of Ti6Al4V

“…This experimental evidence confirms the FEM-simulated results found in the literature [34,38], where ultrasonic-assisted machining over Inconel 718 test samples presented higher temperatures than conventional machining samples. When USassisted drilling was applied, FEM simulations carried out by Mitrofanov have shown that the mean level of stress in the primary shear zone was lower than when ultrasonic-assisted machining was applied [39].…”

Modelling tool wear in cemented-carbide machining alloy 718

“…Thus, it is necessary to capture these dependencies in the material model used, in order to correctly predict the chip formation. Here, neglecting a slight (about 10% between 1/s and 10 4 /s at room temperature according to [18] and nearly zero between 10 2 /s and 10 5 /s at 300 1C according to [19]) strain rate dependency, a rate-independent piecewise linear plasticity model was used. Instead, the flow stress curve after [18] for high strain rate (10 4 /s) was used, see Fig.…”

Surface Integrity of Broached Inconel 718 and Influence of Thermal Exposure

“…It has been shown that the nano-indentation technique is frequently engaged in characterizing the machining induced work-hardened layer beneath the machined surface [94][95][96]. In addition, nano-indentation also provides an alternative approach to estimate other surface integrity issues which have an influence on the micro-mechanical behavior of the machined alloy, such as residual stresses [97] and phase transformations [98] The nano-indentation tests in this thesis were performed at Lund University in order to characterize the machining induced work-hardening beneath the broached surface, and to investigate the effect of thermal exposure on the sub-surface mechanical behavior of broached Inconel 718 as well.…”