Microstructure and mechanical characterization of Incoloy 825 Ni-based alloy welded to 2507 super duplex stainless steel through dissimilar friction stir welding

2019 ◽  
Vol 29 (8) ◽  
pp. 1677-1688 ◽  
Author(s):  
Jalal KANGAZIAN ◽  
Morteza SHAMANIAN
Keyword(s):  
Stainless Steel ◽  
Friction Stir Welding ◽  
Duplex Stainless Steel ◽  
Mechanical Characterization ◽  
Super Duplex Stainless Steel ◽  
Friction Stir ◽  
Dissimilar Friction Stir Welding ◽  
Incoloy 825

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.

Metallurgical and mechanical characterization of electron beam welded super-duplex stainless steel UNS 32750

2014 ◽  
Vol 16 (4) ◽  
pp. 527-534 ◽  
Author(s):  
K. Devendranath Ramkumar ◽  
Debidutta Mishra ◽  
M.K. Vignesh ◽  
B. Ganesh Raj ◽  
N. Arivazhagan ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Electron Beam ◽  
Duplex Stainless Steel ◽  
Mechanical Characterization ◽  
Super Duplex Stainless Steel
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