Effects of heat input and cooling rate during welding on intergranular corrosion behavior of high nitrogen austenitic stainless steel welded joints

2020 ◽  
Vol 166 ◽  
pp. 108445
Author(s):  
Jianguo Li ◽  
Huan Li ◽  
Yu Liang ◽  
Pingli Liu ◽  
Lijun Yang ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Cooling Rate ◽  
Corrosion Behavior ◽  
Welded Joints ◽  
Heat Input ◽  
Intergranular Corrosion ◽  
High Nitrogen

scholarly journals Corrosion Behavior of Nickel-Free High Nitrogen Austenitic Stainless Steel in Simulated Biological Environments

2002 ◽  
Vol 43 (12) ◽  
pp. 3100-3104 ◽  
Author(s):  
Daisuke Kuroda ◽  
Sachiko Hiromoto ◽  
Takao Hanawa ◽  
Yasuyuki Katada
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Corrosion Behavior ◽  
High Nitrogen

scholarly journals Application of electrochemical methods for the investigation of intergranular corrosion welded joint austenitic stainless steel 19Cr-9Ni

2011 ◽  
Vol 65 (2) ◽  
pp. 179-186 ◽  
Author(s):  
Bore Jegdic ◽  
Ana Alil ◽  
Zlatan Milutinovic ◽  
Zoran Odanovic ◽  
Bojan Gligorijevic ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Welded Joints ◽  
Intergranular Corrosion ◽  
Significant Degree ◽  
Electrochemical Methods ◽  
Double Loop ◽  
Quantitative Evidence ◽  
Degree Of Sensitization ◽  
Electrochemical Potentiokinetic Reactivation

Sensitization degree of the austenitic stainless steel welded joints was investigated by electrochemical methods of the double loop electrochemical potentiokinetic reactivation (DL EPR) in H2SO4 + KSCN solution, and by the measurement of corrosion potential of the steel in the drop of the solution of HNO3 + FeCl3 + HCl. The welded joints were tested by X-ray radiographic method in order to check the presence of the weld defects. Grain size of the base metal and the welded joints were determined by optical microscopy. Good agreement between the results obtained by different electrochemical methods was obtained. Heat-affected zone (HAZ) of the austenitic stainless steel welded joints has shown significant degree of sensitization. The double loop electrochemical potentiokinetic method gave quantitative evidence about susceptibility of the stainless steel to intergranular corrosion.

scholarly journals Effect of Welding Thermal Cycles on Microstructure and Mechanical Properties of Multi-Strand Composite Welding Wire Welded Joints of High Nitrogen Austenitic Stainless Steel

2019 ◽  
Author(s):  
jianguo Li ◽  
Huan Li ◽  
Yu Liang ◽  
Pingli Liu ◽  
Lijun Yang
Keyword(s):  
Mechanical Properties ◽  
Cooling Rate ◽  
Welded Joints ◽  
Heat Input ◽  
Weld Seam ◽  
High Heat ◽  
High Nitrogen ◽  
Welding Wire ◽  
Delta Ferrite ◽  
High Heat Input

A multi-strand composite welding wire was applied to join high nitrogen austenitic stainless steel, and microstructures and mechanical properties were investigated. The electrical signals demonstrate that the welding process using a multi-strand composite welding wire is highly stable. The welded joints are composed of columnar austenite and dendritic ferrite and welded joints obtained under high heat input and cooling rate have a noticeable coarse-grained heat-affected zone and larger columnar austenite in weld seam. Compared with welded joints obtained under the high heat input and cooling rate, welded joints have the higher fractions of deformed grains, high angle grain boundaries, Schmid factor and the lower dislocation density under the low heat input and cooling rate, which indicate a lower tensile strength and higher yield strength. The rotated goss (GRD) orientation of a thin plate and the cube (C) orientation of a thick plate are obvious after welding, but the S orientation at 65° sections of Euler’s space is weak. The δ-ferrite was studied based on the primary ferrite solidification mode. It is observed that low heat input and high cooing rate result in the increasing of δ-ferrite and high dislocation density was obtained in grain boundaries of δ-ferrite. M23C6 precipitates due to low cooling rate and heat input in weld seam and deteriorates the elongation of welded joints. The engineering stress-strain curves also show the low elongation and tensile strength of welded joints under low heat input and cooling rate, which is mainly caused by the high fraction of δ-ferrite and the precipitation of M23C6.

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