Material Card Index
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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 of the measuring function you must activate Javascript in your Browser.
Measuring precision at the different magnifications:

12,5 : 1          ca. 9 µm
50 : 1          ca. 2 µm
100 : 1          ca. 1 µm
200 : 1          ca. 0,5 µm
500 : 1          ca. 0,2 µm
1000 : 1          ca. 0,1 µm 

Material selection

Analyses selection

Material information