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Ferrite Phase Fraction Quantification in Stress Corrosion Cracked Duplex Welds

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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$20.00
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