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

Kaňa V., Pernica V., Zadera A., Krutiš V.

Archives of Foundry Engineering

2019

iss. 2

85--90

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.

Pomiar ferrytu w stali lean duplex S32101 i jej złączach spawanych

Niagaj J., Mazur Ł.

Biuletyn Instytutu Spawalnictwa w Gliwicach

2011

R. 55, nr 1

45-52

Przedstawiono wyniki badań zawartości ferrytu za pomocą ferrytoskopu w stali lean duplex S32101 i jej złączach spawanych oraz wpływ na wyniki pomiarów takich czynników, jak: grubość mierzonej próbki, stan i kształt powierzchni pomiarowej itp. Omówiono stosowanie współczynników korekcyjnych. Wyszczególniono problemy powstające podczas wykonywania pomiarów ferrytu w złączach spawanych oraz sposoby ich eliminowania. Przedstawiono wpływ parametrów spawania metodą MAG na zawartość ferrytu w doczołowych złączach spawanych stali lean duplex S32101.

It has been presented the results of testing the ferrite content in S32101 lean duplex steel and its welded joints by means of ferritoscope as well as the influence of such factors as the sample thickness, measurement area shape and state etc. on the test results. The application of correction coefficients has been discussed. The problems arising during measurements of ferrite content in welded joints and the ways of prevention of them have been specified. The influence of MAG welding parameters on the ferrite content in S32101 lean duplex steel butt welded joints has been also presented.