Abstract
In this paper, the effects of turning and surface polishing treatments on surface integrity and fatigue properties of superalloy GH4169 were investigated. Finish turning (FT), surface circumferential polishing treatment (TCP), surface oblique texture (TCPO), and surface axial texture (TCPA) were applied to GH4169 superalloy. The surface roughness, surface topography, residual stress, microhardness, and microstructure after different processes were studied. Rotating bending fatigue tests were carried out to investigate the effects of surface integrity and surface texture direction on the fatigue performance of GH4169. The experiments reveal that the TCPA specimens present the longest fatigue life of 15.01 × 104 cycles. By comparison with the FT, TCP, and TCPO specimens, the fatigue lives of TCPA specimens are increased by 134.2%, 183.7%, and 96.2%, respectively. Single crack initiation source is observed for TCPA specimen. It is mainly attributed to the small surface stress concentration factor and surface axial texture.
Highlights
Because of the good mechanical properties, the GH4169 superalloy is widely used to manufacture the hottest end parts of aero-engines and various industrial gas turbines, such as the turbine blades, guide vanes, turbine disks, and combustion chambers
TCPA specimen present the longest fatigue are increased by 134.2%, 183.7%, and 96.2%, respectively
The surface texture direction for are increased by 134.2%, 183.7%, and 96.2%, respectively
Summary
Because of the good mechanical properties, the GH4169 superalloy is widely used to manufacture the hottest end parts of aero-engines and various industrial gas turbines, such as the turbine blades, guide vanes, turbine disks, and combustion chambers. Fatigue fracture is the most extensive failure mode for the aerospace components. The component surface is the boundary between the contact components and its surroundings, and many fatigue cracks initiate from the machined surface of the component. The surface state of component has been found to be the dominant factor affecting the fatigue performance. The surface integrity and fatigue properties of GH4169 alloy have received extensive attention from scholars in various countries. Kamata et al [1] reported that
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