ABSTRACT
Objective: The experiment was carried out to learn about the metallographic sample
preparation process as well as the basic functions and use of an optical microscope.
Furthermore, the experiment was carried out in order to perform microstructure
analysis and, finally, to comprehend the theoretical context of sample preparation
and metallographic specimens. A rigid step by step procedure must be followed
when preparing metallographic specimens to determine microstructure and material.
To achieve a good microscopic image, the metal used must be carefully prepared
and polished. Methods: There are six process was conducted during the experiment
which are cutting, mounting, grinding, polishing, and etching were used to prepare
the sample, which was then observed using a metallurgical microscope. The thin,
highly deformed layer added during grinding and polishing is removed by etching.
After the etching process is completed, the selected sample can be examined under
an optical microscope. It was observed with varying magnifications of x50, x100,
x200, and x400 under an optical microscope. To show accurate microstructures,
specimens must be kept clean and the preparation process meticulously followed.
Results: The photomicrograph obtained during the metallographic analysis will be
identified. As per the obtained photomicrograph, the results of the metallographic
observation reveal the grain structure consist of ferrite and pearlite. As the
magnification increases, the grain size becomes larger. Conclusion: Finally, in order
to produce a good microscopic image, the preparation process is the most important
process in metallography analysis. Therefore, it is essential to classify the
photomicrograph obtained from the metallographic test.
