The represented materials with micrographs, which you
can see in the following, are represented unbiasedly. In detail only the sample state,
the etching process, the photo enlargement and the assessment according to a testing
method are indicated. An assessment as "well" or "bad" was not
done. Because there are different operational areas and ranges of applications for
each material, such a classification is possible only under knowledge of all environment
factors. The pictures give only an overview of possible crystalline structures or other
metallographic characteristics. All photos can be seen in an extended scale by a click
on the magnifying glass. The pictures in the normal representation have an after-extension
on the screen of ca. 40 % (related to 17 " monitor at 1024 x 768 pixels).
The photos were taken at materials in the dimensions
of 5 to 30 mm, deviations of it are noted on the individual pages.
In some cases the assessment according to a testing
method is not completely corresponding to the rules. In particular this applies to
evaluations of the crystalline structure after the steel-iron specification 1520. Actually
the range of validity is reduced to steel with a maximum amount of 5 % alloying additions.
The operational area of SEP 1520 is very frequently extended because of the missing
reference rows for the highly alloyed steels. I think , with appropriate arrangements
of customer and supplier of the steel and with adaptation of microstructural specialities
and appropriate adjustments of the evaluation the material can be tested in such ways.
This comparison method is frequently applied in the following micrographs.
The materials shown in the picture documentations can
be seen over the selection "Material
selection" (sorted by material
groups) or over "Analysis selection" (sorted by material numbers). General material information can be found
under the link of the same name.
At the enlarged views a measuring function is available.
The measuring spots 1 and 2 get specified with the left mouse button and the distance
between them gets computed on base of the magnification scale. An optical measuring
point marking takes place on the screen by means of little measuring crosses. For use
Measuring precision at the different magnifications:
12,5 : 1 ca.
50 : 1 ca.
100 : 1 ca.
200 : 1 ca.
500 : 1 ca.
1000 : 1 ca.