Abstract

The machining of Inconel 718 with high surface integrity and long fatigue life is a challenging work in aero-industry due to their difficult-to-cut properties. Both the surface integrity and service performance for machined Inconel 718 components need further improvements. In this study, the combined finish turning (FT) and low plasticity burnishing (LPB) surface modification processes has been proposed for the sake of improving surface integrity and fatigue performance of machined Inconel 718. Firstly, the surface integrity characteristics such as surface topography, roughness, micro-hardness, phase change and principal residual stress of machined Inconel 718 through the combination of FT with LPB processes are investigated. Subsequently, the fatigue performance of machined Inconel 718 is systematically evaluated by uniaxial tension-tension fatigue tests. Finally, the effect of surface integrity evolution on fatigue performance of Inconel 718 is revealed. The fatigue life can be improved by 82.4% with the combination of FT and LPB-18 process in comparison with FT process. The improved fatigue life dependence on the decreased surface roughness and the enhanced minimum principal residual stress field can be concluded by comparing different LPB processes.

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