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Under the optical microscope, the science of studying the rules of the structure and morphology of metal materials is called metallography. Metallographic analysis is an indispensable and important means for testing material structure and ensuring product quality. With the development of science and technology, especially optical technology, the performance of optical microscopy is expanding gradually, such as dark field, polarization, phase contrast, differential interference, infrared and ultraviolet light applications, etc. to improve the clarity and resolution of metallographic structure.

Analysis of projects and standards

Test process

In metallographic analysis, samples should be prepared according to various inspection standards and regulations. If improperly prepared, false phenomena may occur, thus drawing wrong conclusions. Therefore, the preparation of metallographic samples is very important. Usually, the preparation steps of metallographic samples are sampling, mosaic, labeling, grinding, polishing and etching. But not every metallographic specimen must go through the above steps. If the selected sample is suitable in shape and size for grinding, no mosaic is necessary. If non-metallic inclusions in metal materials or graphite in cast iron are examined, no etching is necessary. In a word, the procedure of sample preparation should be determined according to the purpose of inspection.

Test equipment

The Metal Laboratory is equipped with a complete set of Buehler's metallographic sample preparation equipment and Zeiss's positive metallographic microscope in Germany, which can realize professional metallographic analysis from ferrous to non-ferrous metals.