Experimental study of the connection between process parameters, thermo-mechanical loads and surface integrity in machining Inconel 718
| Autor: | Hui Liu, Markus Meurer, Thorsten Augspurger, Thomas Bergs, Patrick Mattfeld |
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| Rok vydání: | 2020 |
| Předmět: |
0209 industrial biotechnology
Materials science Normal force 02 engineering and technology 010501 environmental sciences Microstructure 01 natural sciences Superalloy 020901 industrial engineering & automation Machining Residual stress General Earth and Planetary Sciences Tool wear Composite material Inconel 0105 earth and related environmental sciences General Environmental Science Surface integrity |
| Zdroj: | Procedia CIRP. 87:59-64 |
| ISSN: | 2212-8271 |
| DOI: | 10.1016/j.procir.2020.02.081 |
| Popis: | The machining process has a major influence on the microstructure and the residual stresses of the manufactured surface and it’s final functionality. This functionality of surface integrity is of particular interest in safety critical aero engine parts made of temperature resistant super alloys such as nickel-chromium-based alloys. Besides the high tool wear, the machining of such materials is in particular challenging with regard to process induced microstructure alterations and the formation of low toughness and high hardness white layers. The current publication shows an experimental study and affiliated methodology in order to examine the influence of the process state conditions on the surface integrity, with regard to localized temperatures and forces causing white layer as well as residual stresses. On the experimental side a tailor made orthogonal milling setup was used in order to evaluate the transient temperature fields occurring in the workpiece together with the fluctuating process forces acting on its surface. This setup included a synchronized dynamometer, a thermal camera as well as a ratio pyrometer. The cutting forces and cutting normal forces under known engagement conditions were calculated from the transformed Cartesian dynamometer measurements and the measured cutter rotation angle. An evaluation of the surface integrity alteration was finally carried out analyzing the surface microstructure by light microscopy as well as residual stress measurements by X-ray diffraction. |
| Databáze: | OpenAIRE |
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