scholarly journals Pitting Corrosion Characteristic Depending on Welding Pass and Heat Input of GTA Weldment on Superaustenitic Stainless Steel(UNS S32654)

2020 ◽  
Vol 38 (6) ◽  
pp. 528-534
Author(s):  
Dae-Hwan Ko ◽  
Young-Il. Park ◽  
Yong-Taek Shin
Keyword(s):  
Stainless Steel ◽  
Pitting Corrosion ◽  
Heat Input ◽  
Corrosion Characteristic ◽  
Superaustenitic Stainless Steel

scholarly journals Corrosion Behavior of Welded Joints in Different Stainless Steels

2001 ◽  
Vol 71 (3) ◽  
pp. 440-449
Author(s):  
Eniko Reka Fabian ◽  
Janos Kuti ◽  
Jozsef Gati ◽  
Laszlo Toth
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Pitting Corrosion ◽  
Stainless Steels ◽  
Heat Affected Zone ◽  
Welding Speed ◽  
Welded Joints ◽  
Heat Input ◽  
Laser Power ◽  
Base Material

The welded metals characteristics produced by TIG welding or laser beam welding depend on heat input as a function of laser power and welding speed. High laser power and high welding speed have produced welded joint with a remarkable decrease in fusion zone size and an acceptable weld profile with high weld depth/width ratio. At duplex stainless steels the microstructure of welded metal, and heat affected zone is strongly influenced by cooling rate, which is depend on heat input as a function of laser power and/or welding speed. It was found that increasing welding speed the corrosion rate of welded joints decreased. In austenitic stainless steels appeared pitting corrosion in the base material as well as in the welding zone. In case of 2304 duplex stainless steel pitting corrosion appeared in welded metal and heat affected zone in case of autogenously welding, but at 2404 duplex stainless steel pitting appear more in the heat affected zone.

Influence of Intermetallic Precipitates on Pitting Corrosion of High Mo Superaustenitic Stainless Steel

2015 ◽  
Vol 68 (S2) ◽  
pp. 267-279 ◽  
Author(s):  
M. Balakrishnan ◽  
J. Anburaj ◽  
S. S. Mohamed Nazirudeen ◽  
L. Neelakantan ◽  
R. Narayanan
Keyword(s):  
Stainless Steel ◽  
Pitting Corrosion ◽  
Superaustenitic Stainless Steel ◽  
Intermetallic Precipitates

Influence of Microstructure on Pitting Corrosion Resistance of Alloy 904L Superaustenitic Stainless Steel

CORROSION ◽  
10.5006/0534 ◽  
2012 ◽  
Vol 68 (8) ◽  
pp. 739-746 ◽  
Author(s):  
B.A.R.S. Barbosa ◽  
S.S.M. Tavares ◽  
A. Cobuci ◽  
M.C.S. de Macêdo
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
High Temperatures ◽  
Pitting Corrosion ◽  
Nickel Content ◽  
Microstructural Analysis ◽  
Superaustenitic Stainless Steel ◽  
Pitting Corrosion Resistance ◽  
High Nickel ◽  
Mo Additions

Alloy 904L (UNS N08904) is a superaustenitc stainless steel with high Cr and Mo additions. The steel also contains high nickel content, which is important to maintain the austenitic structure. Because of its high corrosion resistance, Type 904L alloy is being used in much equipment in chemical and petrochemical plants. Some of this equipment may experience high temperatures in service or during fabrication. The microstructural changes associated with exposures in the range of 650°C to 850°C or as a consequence of melting were analyzed in this paper. The microstructure/corrosion resistance relationships were studied by means of electrochemical pitting corrosion tests and microstructural analysis. Critical pitting temperatures (CPT) of annealed and cast specimens were determined and compared. The results show that the corrosion resistance can vary significantly with fabrication processes and/or service at high temperatures.

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