Prediction of Sigma Phase Precipitation in Super Duplex Stainless Steel Weldments

2006 ◽  
Vol 50 (3-4) ◽  
pp. 13-28 ◽  
Author(s):  
K. Nishimoto ◽  
K. Saida ◽  
O. Katsuyama
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Sigma Phase ◽  
Super Duplex Stainless Steel ◽  
Phase Precipitation

Influence of Aging Time on Sigma Phase Precipitation in SAF2507 Super-Duplex Stainless Steel

2009 ◽  
Vol 620-622 ◽  
pp. 355-358 ◽  
Author(s):  
Wei Zhang ◽  
De Ning Zou ◽  
Guang Wei Fan ◽  
Jiao Li
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Aging Time ◽  
Sigma Phase ◽  
Phase Interface ◽  
Super Duplex Stainless Steel ◽  
Phase Precipitation ◽  
X Ray Diffraction ◽  
Austenitic Phase ◽  
Hardness Tester

Specimens of SAF2507 super-duplex stainless steel were heated at 920°C with different aging time. The phase transformation and development of microstructure in the materials were investigated by color optical microscopy, scan electron microscopy, energy-dispersive spectroscopy and X-ray diffraction. The hardness was tested by HB-3000B hardness tester. The facts that sigma phase precipitated right after 2 min. At 920°C, the grain boundaries to be the preferential precipitation sites and the sites changed from ferritic-austenitic phase interface into the inside of ferritic phase was found. Increase in aging time is proportional to the increase in sigma phase precipitation mass was most frequently observed in specimens. For phase precipitation, the values of hardness of the super-duplex stainless steel was enhanced evidently.

Influence of Sigma Phase Precipitation on Pitting Corrosion of 2507 Super-Duplex Stainless Steel

2010 ◽  
Vol 658 ◽  
pp. 380-383 ◽  
Author(s):  
Ying Han ◽  
De Ning Zou ◽  
Wei Zhang ◽  
Jun Hui Yu ◽  
Yuan Yuan Qiao
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Ambient Temperature ◽  
Duplex Stainless Steel ◽  
Pitting Corrosion ◽  
Super Duplex Stainless Steel ◽  
Phase Precipitation ◽  
Pitting Potential ◽  
Σ Phase ◽  
Pitting Corrosion Resistance

Specimens of 2507 super-duplex stainless steel aging at 850°C for 5 min, 15 min and 60 min were investigated to evaluate the pitting corrosion resistance in 3.5% NaCl solution at 30°C and 50°C. The results are correlated with the microstructures obtained with different aging time. The precipitation of σ phase remarkably decreases the pitting corrosion resistance of the steel and the specimen aged for 60 min presents the lowest pitting potential at both 30°C and 50°C. With increasing the ambient temperature from 30°C to 50°C, the pitting potential exhibits a reduction tendency, while this tendency is less obviously in enhancing the ambient temperature than in extending the isothermal aging duration from 5 to 60 min. SEM analysis shows that the surrounding regions of σ phase are the preferable sites for the formation of corrosion pits which grew up subsequently. This may be attributed to the lower content of corrosion resistance elements in these regions formatted with σ phase precipitation.

Effect of sigma phase on the wear behavior of a super duplex stainless steel

Wear ◽  
2013 ◽  
Vol 303 (1-2) ◽  
pp. 584-590 ◽  
Author(s):  
G. Fargas ◽  
A. Mestra ◽  
A. Mateo
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Sigma Phase ◽  
Wear Behavior ◽  
Super Duplex Stainless Steel

scholarly journals Thermal cycling induced stress–assisted sigma phase formation in super duplex stainless steel

2019 ◽  
Vol 182 ◽  
pp. 108003 ◽  
Author(s):  
Jian-Sin Li ◽  
Guan-Ju Cheng ◽  
Hung-Wei Yen ◽  
Liberty T. Wu ◽  
Yo-Lun Yang ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Thermal Cycling ◽  
Duplex Stainless Steel ◽  
Phase Formation ◽  
Sigma Phase ◽  
Super Duplex Stainless Steel ◽  
Induced Stress
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