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Metallography examinations

Metallography is the study of the structure of metals and of metal alloys through the examination of specimens with a metallurgical microscope. The structures observed in the microscope are often recorded photographically.

General procedures for the metallographic examination:

  • Selecting a representative sample of the materials

  • Sectioning the sample to avoid altering or destroying the structure of interest

  • Mounting the section without damage to the sample

  • Grinding to achieve a flat sample with a minimum amount of damage to the sample surface

  • Polishing the mounted and ground sample

  • Etching in the proper etchant to reveal the microstructural details

Selecting a representative sample to properly characterize the microstructure or the features of interest is a very important first step. For example, grain size measurements are performed on transverse sections, whereas general microstructure evaluations are performed on longitudinal sections. Therefore, it is important for the laboratory personnel to be given information about the orientation or to be shown the rolling direction of the test specimen that the customer provides. 

Summary of Capabilities:

  • Apparatus for sample preparation : Metallography cutter machine, Mounting device, Automatic Grinder and Polisher machine, Fume hood for eatching

  • Professional Leica DMi8 microscope with sowftware

Laboratory offers you these services:

  • Microstructure examinations

  • Grain size analysis for Forged Steel according to ISO 643, ASTM 112 and DIN 50601

  • Cleanliness examination according to ISO 4967, DIN 50602 and ASTM E45

  • Carbide structure in steels according to SEP 1520

  • Depth of decarbon examination according to DIN 50192

  • Macroscopic examination (Baumann method)

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