Abstract
A brief description of surface nanosrystallization process via severe plastic deformation is presented. To come to the point different shot peening methods which have proved to be able to create nanocrystalline layers are demonstrated clarifying the actual state of the art. Then the influence of the process is reviewed on material behavior and a wide range of affected properties are investigated. On this basis some possible addresses for future research in this field are drawn and underlined.
Highlights
I n the last few decades, ultrafine-grained materials, especially nanocrystalline (NC) characterized by crystal grains with dimensions up to 100 nm, have attracted considerable scientific interest, since nanostructured materials are expected to possess superior mechanical properties in simple chemical compositions fundamentally different from their conventional coarse-grained polycrystalline counterparts [1,2,3,4,5,6,7,8,9,10]
The present study focuses on the application of shot peening processes to obtain NC surfaces as this technique is a popular process in industries widely used due to its flexibility, which makes it possible to be used for components of almost any shape
Fewer investigations are performed on fatigue and in this case all the results demonstrate an improved behavior after formation of NC layers
Summary
I n the last few decades, ultrafine-grained materials, especially nanocrystalline (NC) characterized by crystal grains with dimensions up to 100 nm, have attracted considerable scientific interest, since nanostructured materials are expected to possess superior mechanical properties in simple chemical compositions fundamentally different from their conventional coarse-grained polycrystalline counterparts [1,2,3,4,5,6,7,8,9,10]. Jiang et al carried out corrosive immersion tests on sand blasted 35A commercially pure titanium specimens (treated with SiO2 particles of 200–300 μm in diameter and compressed air pressure of about 300 psi followed by a recovery treatment below 300 °C, for 30 min with subsequent air cooling).The results indicated that in the surface nano-crystalline layer, the high density of grain boundaries was beneficial to the formation of a thin passive film, which could restrict the movement of metal ions from metal surface to the solution, minimizing corrosion and improving polarization behavior of the sandblast-annealed titanium [46]. The enhancement of material’s magnetic properties is significantly favorable for its application in several fields of engineering
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