Abstract The oxidation resistance of novel γ / ’-strengthened Co-base superalloys is clearly outmatched by their Ni-base counterparts within the high-temperature regime. Therefore, surface modification strategies to foster protective alumina growth seem auspicious. This study elucidates impact fluorination and shot-peening on formation at 900 °C for a quaternary model alloy (Co-Al-W-Ta system) ...

The objective of this paper is to discuss the application calibration methodology exposed in previous part shot-peened Inconel 718 specimens. Shot peening commonly used increase fatigue life critical parts such as turbine discs. This surface treatment induces residual stresses, work hardening and possibly, gradients microstructures that, turn, affect life. Work a quantity that represents set ph...

We report the role of ultrasonic shot-peening (SP) and laser-shock peening (LSP) on insertion atmospheric nitrogen during high temperature oxidation pure titanium improvement its resistance. Ion Beam analysis showed that for short durations, a layer Ti2N is formed at oxide-metal interface. However, only LSP treatment leads to formation long-term stable nitrogen-rich which acts as barrier diffus...

Abstract Shot peening processes are commonly used for improving the fatigue properties of steels. introduces a compressive residual stress field in near surface steel, which can reduce or stop growth cracks and improve properties. This study experimentally investigated effect shot on 50CrV4 steel alloys with different artificial defects. Drilling tools were to introduce defects root radii 0.585...

Shot peening (SP) is frequently used as a palliative measure against metal fatigue in many engineering components. The performance of this surface treatment depends on different factors including the material, shape and loading conditions component, well process parameters. Fatigue improvement due to SP great extent upon in-depth compressive residual stress profile produced specimen. In work, w...

Controlled, uniform, peening has been used to impose precise cov onto mild steel plate specimens. This was achieved by using an the specimens under a single, precision-loaded, 2mm diameter studies have revealed a surprising relationship between percent surface residual stress. Stress increases almost linearly with low coverages but reaches a maximum at about 80% coverage. At 100% coverage the i...