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Ferrite Phase Fraction Quantification in Stress Corrosion Cracked Duplex Welds

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Recent experiences with duplex 2205 stainless steel welds have shown that stress corrosion cracking can occur which may lead tocatastrophic failures. Known microstructural parameters such as ferrite phase fraction seems to play a significant role in crack propagation. Therefore quantifying ferrite phase fraction is an important step in ensuring weld quality. Several methods such as ASTM E562 point count electro-etching color-etching and optical image analysis as well as electron backscattred diffraction (EBSD) are utilized to quantify the ferrite fraction in duplex welds that have failed in service. Results of quantification by these methods are compared in terms of accuracy versatility and ability to apply in-field. Quantification results in cross-sectional samples indicate that local ferrite phase fraction is more meaningful than average fraction as cracks tend to propagate along high ferrite regions. Investigations on a number of cracked welds reveal that initiated cracks from the root pass reach the high ferrite region in coarse-grained heat affected zone (CGHAZ) and propagate along this region into filling passes. Further detailed microstructural results will be presented and discussed.Keywords: Duplex 2205 Stainless Steel; Welding; Ferrite Fraction; Stress Corrosion Cracking (SCC).

Product Number: 51319-13263-SG
Author: Majid Abbasi
Publication Date: 2019
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Picture for Study on Ferrite Measurement Methods for Duplex Stainless Steel Welds
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51318-10634-Study on Ferrite Measurement Methods for Duplex Stainless Steel Welds

Product Number: 51318-10634-SG
Author: Nozomi Satake / Mikihiro Sakata / Tomoaki Kiso / Toshiaki Okabe /
Publication Date: 2018
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Ferrite measurements are used during welding procedures on duplex stainless steel. We studied the effects on the measured ferrite contents of (1) grid size, (2) number of fields and (3) measurement locations.

 
Picture for Ferrite Measurement in Duplex Stainless Steels
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Ferrite Measurement in Duplex Stainless Steels

Product Number: 51319-13437-SG
Author: Kasra Sotoudeh
Publication Date: 2019
$20.00

Duplex stainless steels typically contain 50% austenite and 50% ferrite. Phase balance is important in duplex stainless steels as it helps to impart optimum mechanical properties and corrosion resistance. Welding may alter the phase balance and so it is necessary to assure that phase balance is still within acceptable ranges. Ferrite measurement practice will be reviewed in terms of existing established techniques and recent advances in materials characterisation tools. Measurement precision and accuracy will be discussed.
Picture for 06497 EFFECT OF WELDING RELATED MICROSTRUCTURE
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06497 EFFECT OF WELDING RELATED MICROSTRUCTURE ON STRESS CORROSION CRACKING SUSCEPTIBILITY IN CAUSTIC SOLUTIONS

Product Number: 51300-06497-SG
ISBN: 06497 2006 CP
Author: Ananya Bhattacharya, Preet M Singh, Heikki Leinonen, Jamshad Mahmood
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Stress Corrosion Cracking in the weld and heat affected zones of Duplex Stainless Steels has been experienced in different industries.  In this paper, an attempt has been made to study the various aspects of this type of corrosion, brought about by welding.  Results show duplex stainless steel base metal is also susceptible.
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