Directed Energy Surface Modifications: Ion Beam, Electron Beam, and Laser Beam (Texturing, Shock Peening, and Nitriding)

Abstract

Surface modification involves enhancing the functional properties of a material's surface through alterations in its topography or chemical composition. Common techniques employed in surface modification include surface texturing, engraving, shock peening, and nitriding. These methods are widely utilized to improve surface characteristics such as wear resistance, friction, and chemical reactivity, tailored to specific industrial applications including electronics, automobile, defense, marine, and aerospace industries. Surface texture refers to the micro-to nano-scale features arranged in a specific pattern and distribution on a surface. These textures are designed to enhance and increase functionality to the surface by modifying its physical and chemical interactions with its environment. Engraving is a technique analogous to surface texturing, wherein patterns, designs, or text are inscribed onto the material's surface. Shock peening is a strengthening process that induces compressive residual stress into the target surface using a flexible high-energy tool. Shock peening helps to improve the fatigue properties by delaying crack initiation and increases wear resistance of the metallic surface by modifying it. However, nitriding is a process of diffusing nitrogen into the surface of the metal to improve hardness, wear resistance, and corrosion resistance. This chapter provides an in-depth explanation of highly flexible directed energy surface modification processes, including ion-beam, electron-beam (e-beam), and laser-beam based surface modification. These methods are distinguished by their precision and adaptability to various surface engineering applications. The chapter also delves into the mechanisms of material removal/chemical change inherent to each process, offering insight into the interaction between the energy source and the material surface. Additionally, it discusses the selection of the appropriate surface modification process based on the material and its application. © 2027 selection and editorial matter, Jinoop Arackal Narayanan and Kanmani Subbu Subbian

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