Surface Characterization of Incoloy 825 Ni-Based Alloy/2507 Super Duplex Stainless Steel Dissimilar Friction Stir Welds

CORROSION ◽  
10.5006/2755 ◽  
2018 ◽  
Vol 74 (11) ◽  
pp. 1259-1271 ◽  
Author(s):  
Jalal Kangazian ◽  
Morteza Shamanian ◽  
Ali Ashrafi
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Surface Characterization ◽  
Electrochemical Impedance ◽  
Friction Stir Weld ◽  
General Corrosion ◽  
Super Duplex Stainless Steel ◽  
Friction Stir ◽  
Surface Corrosion ◽  
Incoloy 825

Surface features of a dissimilar friction stir weld between Incoloy 825 Ni-based alloy and SAF 2507 super duplex stainless steel were investigated using scanning electron microscopy, microhardness test, cyclic potentiodynamic polarization, and electrochemical impedance spectroscopy. The surface of the weldment showed lower general corrosion resistance in comparison to the base metals. Areas under the weld shoulder exhibited weak pitting resistance because of the deformed structure and/or chromium nitride precipitates. Incoloy 825 located under the shoulder also displayed the highest susceptibility to pit growth because of the austenite matrix containing titanium nitride phases. Overall, the obtained results demonstrated that the friction stir welding method could significantly deteriorate the surface corrosion behavior of the processed regions.

scholarly journals Microstructure and mechanical properties of friction stir welded 8 mm pipe SAF 2507 super duplex stainless steel

2019 ◽  
Vol 8 (1) ◽  
pp. 243-249 ◽  
Author(s):  
Rafael Arthur Reghine Giorjão ◽  
Victor Ferrinho Pereira ◽  
Maysa Terada ◽  
Eduardo Bertoni da Fonseca ◽  
Ricardo Reppold Marinho ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Super Duplex Stainless Steel ◽  
Friction Stir ◽  
Microstructure And Mechanical Properties

Hydrogen embrittlement under cathodic protection of friction stir welded UNS S32760 super duplex stainless steel

2017 ◽  
Vol 706 ◽  
pp. 48-56 ◽  
Author(s):  
Cristian Pohl Meinhardt ◽  
Adriano Scheid ◽  
Jorge Fernandez dos Santos ◽  
Luciano Andrei Bergmann ◽  
Marcelo Borges Favaro ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Hydrogen Embrittlement ◽  
Duplex Stainless Steel ◽  
Cathodic Protection ◽  
Super Duplex Stainless Steel ◽  
Friction Stir

Relating General and Phase Specific Corrosion in a Super Duplex Stainless Steel with Phase Specific Microstructure Evolution

CORROSION ◽  
10.5006/3091 ◽  
2019 ◽  
Vol 75 (11) ◽  
pp. 1315-1326 ◽  
Author(s):  
Riya Mondal ◽  
Sunil Kumar Bonagani ◽  
A. Lodh ◽  
Tenneti Sharma ◽  
P.V. Sivaprasad ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Duplex Stainless Steel ◽  
Corrosion Behavior ◽  
True Strain ◽  
Shear Bands ◽  
Austenite Phase ◽  
General Corrosion ◽  
Super Duplex Stainless Steel ◽  
Band Formation

Controlled near plane strain deformation was imposed on a super duplex stainless steel. Subsequent characterization involved extensive microtexture measurements, and measurements of general corrosion and corrosion behavior (and nature of the passive film) of the individual phases. The general corrosion was controlled by the corrosion performance of the austenite phase, and corresponding microtextural developments. Corrosion resistance in the austenite phase, as well as the general corrosion, improved until a true strain of 0.26 and then dropped. Enhanced corrosion resistance coincided with slip band formation and generation of low-angle boundaries. Beyond a strain of 0.26, shear bands and associated lattice curvatures plus high-angle boundaries led to a clear degradation in the corrosion behavior.

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