Milad Karimi
Abstract
Introduction: Metallography in the general sense is the study of the internal structure of metals and alloys and the relationship of this structure with the composition, production ...
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Introduction: Metallography in the general sense is the study of the internal structure of metals and alloys and the relationship of this structure with the composition, production sample, and freezing conditions and their chemical and mechanical properties. One of the important tests of the quantitative and qualitative control unit of the metallographic casting production line, which today has both the quality control and research aspects. Gray cast iron will be produced from an alloy of iron and carbon that is about 2% more or a low cooling rate or silicon that causes instability of cementite. Now, if its carbon content is less than 4.3%, low carbon gray cast iron is obtained, which is easier to cast than steels, which may have merit and pearlite properties. Method: In the initial stages of cutting the sample from the main piece, we find out its clarity, softness and well-cut.Findings: After cutting, it can be filed easily, but sanding it was difficult due to its high softness, so that by spending about 1.3 of the time on sanding cast irons like before, we would reach a flat surface. We put all the files and polishes of the sample under the microscope.Conclusion: At first glance, the overly sanded lines and the polishing machine prevented one from seeing its graffiti. In equipment that wears, iron alloys with the most carbon have the best wear resistance, but due to the many stresses that occur during work, the material used should have sufficient toughness to prevent various defects.
