During the development of the technological process, metallographic studies of the castings of the pilot batch are carried out:
The study of the structure of metals and alloys with the naked eye or at low magnification, using a magnifying glass, is carried out after preliminary preparation of the investigated surface (grinding and etching with special reagents). As a result, the following are installed:
Study of a surface using light microscopes. Microsections are preliminarily prepared (grinding and polishing to a mirror surface). To reveal the microstructure, the surface is etched with reagents depending on the composition of the metal. After preliminary preparation, cracks, non-metallic inclusions, metal structure before and after heat treatment, etc. can be observed on microsections. It is possible to reveal the shape, size and orientation of grains, individual phases and structural components. Magnification - 50 ... 1000 times allows detecting structural elements up to 0.2 microns in size.
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