COMPARISON OF MICROSCOPIC OBSERVATION TECHNIQUES TO DETERMINE VICKERS INDENTATION DIAGONAL LENGTH

S. Takagi, Y. Tanaka, Y. Seino

Abstract

In order to investigate the best way to determine the diagonal length of a Vickers indentation, bright-field (BF), dark-field (DF), differential interference contrast (DIC) and confocal scanning microscopy is utilized to observe indentations on various samples. Each of BF, DF and DIC methods has advantage and disadvantage and evaluated values should be considered carefully. 3D feature of indentation evaluated with a confocal microscope gives useful information about it. To eliminate the effect of focusing error, focus stacking technique is quite efficient and expected to reduce the uncertainty of measurement of diagonal length. The roughness of sample surface should be taken into account but not only the amplitude parameter, Ra, but also the wavelength parameter, RSm.

Keywords

Vickers hardness; diagonal length measurement; optical microscopy; focus stacking; confocal scanning microscopy

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IMEKO-TC5-2022-049.pdf

DOI

10.21014/tc5-2022.049

IMEKO TC

TC5 - Hardness Measurement

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