Abstract
Scanning probe microscopy techniques are widely applied as three-dimensional (3D) metallography methods in studying metallic microstructures. While providing high lateral and vertical resolutions, these techniques suffer from a limited field-of-view, which is a crucial requirement in many metallurgy studies. Moreover, they are complex and expensive, and need a complicated specimen preparation procedure. In this paper, we utilized reflective digital holographic microscopy for 3D microstructural characterization of metallic surfaces within an adjustable field-of-view and a resolution close to diffraction-limit. Polished and etched CK45 plain carbon steel and AISI 304 stainless steel samples have been studied with the presented method. The experimental results show the capability of the method for metallurgic granular and intergranular studies. The method has the potential to be used in a variety of metallurgic phenomena such as crystal plasticity, microstructural oxidation, and intergranular corrosion.
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