Micro Examination Test
Microscopic Examination is conducted to study the microstructural features of the material under magnification. The properties of a material determine how well it will perform under a given application, and these properties are dependent on the structure of the material.
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Case Depth
Case depth is the thickness of the hardened layer on a specimen. Case hardening improves both the wear resistance and the fatigue strength of parts under dynamic and/or thermal stresses.
Grain Size
These test determination of average grain size in metallic materials are primarily
measuring procedures and, because of their purely geometric basis, are independent of the metal or
alloy concerned.
Decarb Layer
Decarburization is a surface degradation phenomenon in the forging and heat treating of steels. Decarburization may be described as a metallurgical process in which the surface of steel is depleted of carbon, by heating above the lower critical temperature or by chemical action. Steel forgings are usually decarburized. This process can happen as a side effect during a process, or can be performed intentionally.
Inclusion Rating
Microscopic methods are used to characterize the size,
distribution, number, and type of inclusions on a polished
specimen surface. This may be done by examining the specimen
with a light microscope and reporting the types of
inclusions encountered, accompanied by a few representative
photomicrographs. This method, however, does not lend itself
to a uniform reporting style. Therefore, standard reference
charts depicting a series of typical inclusion configurations
(size, type, and number) were created for direct comparison
with the microscopic field of view.
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