Comparison of Methods for Determining the Ferrite Content in Duplex Cast Steels

The paper is concerned with comparing the methods for determining the ferrite content in castings from duplex stainless steels. It uses Schaeffler diagram, empirical formula based calculation, image analysis of metallographic sample, X-ray diffraction and measurement with a feritscope. The influence...

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Bibliographic Details
Published in:Archives of foundry engineering 2019-01, Vol.19 (2), p.85
Main Authors: Kaňa, V, Pernica, V, Zadera, A, Krutiš, V
Format: Article
Language:English
Subjects:
Castings
Duplex stainless steels
Empirical analysis
Ferrite
Image analysis
Mathematical analysis
Measurement methods
Wall thickness
X-ray diffraction
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Summary:The paper is concerned with comparing the methods for determining the ferrite content in castings from duplex stainless steels. It uses Schaeffler diagram, empirical formula based calculation, image analysis of metallographic sample, X-ray diffraction and measurement with a feritscope. The influence of wall thickness of the casting on the ferrite content was tested too. The results of the experiments show that the casting thickness of 25 or 60 mm does not have a significant effect on the measured amount of ferrite. The image analysis of metallographic sample and the measurement with the feritscope appear to be the most suitable methods. On the contrary, predictive methods, such as Schaeffler diagram or empirical formula based calculation are only indicative and cannot replace the real measurements. X-ray diffraction seems to be the least suitable measuring method. Values of ferrite content measured in such a way often deviated from the values measured by image analysis and with feritscope.
ISSN:1897-3310
2299-2944
DOI:10.24425/afe.2019.127121