Effect of repeated TIG welding cycles on microstructure evolution and pitting corrosion behavior of UNS 32760 super duplex stainless steel

Microstructure evolution and pitting corrosion behavior in repeated TIG welding cycles of UNS32760 super duplex stainless steel were studied. The microstructural evolution was observed through optical electron microscope. Meanwhile, pitting corrosion was investigated by means of potentiodynamic pola...

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Bibliographic Details
Published in:IOP conference series. Materials Science and Engineering 2019-02, Vol.478 (1), p.12032
Main Authors: Alfian, Riastuti, R, Winarto
Format: Article
Language:English
Subjects:
Chromium nitride
Corrosion
Corrosion effects
Duplex stainless steels
Evolution
Gas tungsten arc welding
Gravimetry
Heat affected zone
Microstructure
Pitting (corrosion)
Precipitates
Repair
Stainless steel
Welding
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Summary:Microstructure evolution and pitting corrosion behavior in repeated TIG welding cycles of UNS32760 super duplex stainless steel were studied. The microstructural evolution was observed through optical electron microscope. Meanwhile, pitting corrosion was investigated by means of potentiodynamic polarization and gravimetric test. The specimens were evaluated to simulate repeated welding cycles of original weld, Repair-1 (R1), Repair-2 (R2) and Repair-3 (R3) respectively. The result show that the chromium nitride precipitates starts appear in heat-affected zone R-2 welding cycles which followed by the growth of metastable pits.
ISSN:1757-8981
1757-899X
1757-899X
DOI:10.1088/1757-899X/478/1/012032