64 Prakt. Met. Sonderband 50 (20146)
It is not possible to determine the amount of retained austenite metallographically, as the Mögli
majority of it is present in the form of nano-thin films between the bainitic ferrite plates.
Examination of the light etched regions of the steel KAB 1 yield values close to 8%, whereas il
XRD measurements determine it to be 21%. The measured fraction of retained austenite using Gabriele
XRD is generally influenced by the method of specimen preparation, in the current study
however the austenite is highly stable, and not particularly sensitive to the method of In vielen
specimen preparation. zung zu
diese, ei
Conclusions keine Er
o The color contrast obtained via tint etching of the studied steels with 7% Na2S20s has nicht det
been shown to yield reliable and repeatable results, of the martensite volume fraction, Getiigeb
especially when martensite is present in appreciable amounts, it would seem that very setzen ZI
small regions of martensite can also be identified. Tint etching can therefore be Die Fart
deemed a suitable method for analyzing low temperature microstructures in KAB bei Gus:
steels. grenzen,
The retained austenite content cannot be determined with metallographic techniques und Lot
due to the fine scale of the microstructure, but it is useful for determining the coarse untersch
blocky regions detrimental to the overall mechanical properties. aussche
Tint etching has been shown to be advantageous for image analysis compared to attack
etchants. due to a more distinct phase contrast.
Ansetz
Acknowledgement Ansetze
The authors would like to thank dr. Henrik Kaker for performing the XRD measurments. Für das
Natrium
References 5H,0) i
ca. 1kg)
diss ; dann ids
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out une
