Effects of aging temperature on G-phase precipitation and ferrite-phase decomposition in duplex stainless steel

2012 ◽  
Vol 92 (34) ◽  
pp. 4354-4375 ◽  
Author(s):  
T. Hamaoka ◽  
A. Nomoto ◽  
K. Nishida ◽  
K. Dohi ◽  
N. Soneda
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Aging Temperature ◽  
Ferrite Phase ◽  
Phase Decomposition ◽  
Phase Precipitation ◽  
Effects Of Aging

Analysis of χ phase precipitation in aged 2205 duplex stainless steel

2015 ◽  
Vol 30 (3) ◽  
pp. 591-595 ◽  
Author(s):  
Heping Liu ◽  
Hu’er Sun ◽  
Bin Liu ◽  
Dazhao Li ◽  
Fenger Sun ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Phase Precipitation ◽  
2205 Duplex Stainless Steel ◽  
Χ Phase

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.

Optimization of Post Weld Aging on Duplex Stainless Steel UNS31803 Grade with 23 Factorial Designs

2013 ◽  
Vol 717 ◽  
pp. 62-66
Author(s):  
Prachya Peasura ◽  
Nansa Arng Santirat
Keyword(s):  
Tensile Strength ◽  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Aging Time ◽  
Aging Temperature ◽  
Solution Temperature ◽  
P Value ◽  
Corrosion Properties ◽  
Factors Affecting ◽  
Time Interaction

Duplex stainless steel are good combination of economy, weldability and toughness and are often selected where both strength and corrosion properties are crucial. The research was study the effect of post weld aging parameter on mechanical properties. The specimen was duplex stainless steel UNS31803 grade sheet of 10 mm thickness. This experimental study aims at 23factorial design optimizing various post weld aging parameters including solution temperature at 900 and 1,050 °C, post weld aging temperature at 650 and 850 °C and post weld aging time were set at 4 and 8 hour. The welded specimens were tested by hardness testing in heat affected zone and tensile strength testing. The result showed that both of solution temperature, post weld aging temperature and post weld aging time interaction on hardness and tensile strength at 95% confidential (P value < 0.05). Factors affecting the optimum were solution temperature 1050 °C, PWA temperature 850°C and PWA time 4 hr. at hardness optimum of 282.36 HV and tensile strength optimum of 109.37 kN. This research can bring information to the foundation in choosing the appropriate post weld aging parameters to duplex stainless steel welds.

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