Comparative study of finishing techniques for age-hardened Inconel 718 alloy.
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Fecha
2021-11-20Autor
Sarasua Miranda, Jon Ander
Trinidad Cristobal, Ander
Fernández de Lucio, Pablo
Gómez Escudero, Gaizka
Madariaga, Aitor
Arrazola, Pedro José
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Journal of Materials Research and Technology 15 : 623-5634 (2021)
Resumen
Inconel 718 is a widely used alloy in the aeronautic sector due to its excellent mechanical
and corrosion wear resistance under high temperature conditions. However, its good
mechanical properties can be a double edge sword in terms of manufacturing, especially in
those processes based in mechanical principles, such as machining or forming. Considering
that most aeronautic components are exposed to cyclic load and temperature, fatigue
resistance becomes critical, and therefore, the finishing processes. The surface integrity of
a component plays an important role on its fatigue behaviour, as the most common crack
initiation area is usually the surface. The present work compares three different
mechanical finishing processes that confer better surface properties to the component:
polishing, burnishing, and hammer-peening. Each one achieves different degrees of
roughness, and residual stress on the surface. The study is not only focused on the
resultant mechanical properties, but also in productivity and process robustness. It is
concluded that each technology excels in a different property.