scholarly journals Influence of the Solution-Treatment Temperature and Short Aging Times on The Electrochemical Corrosion Behaviour of Uns S32520 Super Duplex Stainless Steel

2019 ◽  
Vol 22 (4) ◽  
Author(s):  
Livio de Carvalho Valeriano ◽  
Edmilson Otoni Correa ◽  
Neide Aparecida Mariano ◽  
Alain Laurent Marie Robin ◽  
Maria A. G. Tommaselli Chuba Machado
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Corrosion Behaviour ◽  
Solution Treatment ◽  
Electrochemical Corrosion ◽  
Treatment Temperature ◽  
Solution Treatment Temperature ◽  
Super Duplex Stainless Steel ◽  
Electrochemical Corrosion Behaviour

scholarly journals Effect of Solution Treatment Temperature on Microstructural Evolution, Precipitation Behavior, and Comprehensive Properties in UNS S32750 Super Duplex Stainless Steel

Metals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1481
Author(s):  
Junhe Li ◽  
Wei Shen ◽  
Ping Lin ◽  
Fuming Wang ◽  
Zhanbing Yang
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Duplex Stainless Steel ◽  
Solution Treatment ◽  
Element Distribution ◽  
Treatment Temperature ◽  
Solution Treatment Temperature ◽  
Super Duplex Stainless Steel ◽  
Σ Phase ◽  
Comprehensive Properties

The changes of microstructures, element distribution, and comprehensive properties were studied to explore their interactions with each other, induced by solution treatment of UNS S32750 super duplex stainless steel. The results showed that the ferrite content improved, while the austenite content declined as the temperature increased. From 900 to 1000 °C, the σ phase existing at α/γ grain boundaries and in ferrite grains gradually dissolved. At 1050 °C, the microstructures consisted of only ferrite and austenite. From 1050 to 1300 °C, the Cr2N precipitated in ferrite and gradually grew and coarsened. The impact energy and pitting potential of UNS S32750 first improved and then weakened, while the hardness is the opposite, owing to the combined effects of element distribution, microstructures, and precipitates. In the presence of the σ phase, the corrosion resistance and mechanical properties of UNS S32750 correspond directly to the σ phase fraction. Subsequently, the rise in temperature promoted γ → α phase transformation, and the elements partitioning ratios of Cr and Mo declined, resulting in reduced toughness and corrosion resistance and a rise in hardness. Consequently, when the solution treatment temperature is 1050 °C, the α/γ ratio of UNS S32750 approached 1:1, with excellent overall properties.

Effects of Solution Temperature on Microstructure and Tensile Properties of Casting Duplex Stainless Steel

2010 ◽  
Vol 146-147 ◽  
pp. 818-824
Author(s):  
Hong Liang Xiang ◽  
Dong Liu ◽  
Fu Shan He
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Tensile Properties ◽  
Energy Dispersive Spectrometer ◽  
Solution Treatment ◽  
Optical Microscope ◽  
Treatment Temperature ◽  
Solution Temperature ◽  
Solution Treatment Temperature ◽  
Super Duplex Stainless Steel

In this paper, effects of solid solution treatment temperature on microstructure and tensile properties of casting SAF 2507 super duplex stainless steel were researched by means of optical microscope (OM), scanning electron microscope (SEM), energy dispersive spectrometer (EDS) and tensile test. The results indicate that the amount of γ phase increases according to a linear relationship f(g ) = -0.134T +159.94 during the temperatures from 1100°C to 1250°C. Tensile properties of casting SAF 2507 super duplex stainless steel fluctuate with solution temperature change. Austenitic grain size and morphology are the most important factors on tensile property. The tensile strength is the highest owing to the finest austenitic grain at the solution temperature of 1150°C. The elongation is related to the fracture mode. At 1100 , elongation ration is highest because of the ductile fracture.

Effect of Solution Treatment on Microstructure and Properties of the SAF2507 Super Duplex Stainless Steel

2012 ◽  
Vol 724 ◽  
pp. 3-6 ◽  
Author(s):  
Jin Ming Liu ◽  
Jie Liu ◽  
Guang Wei Fan ◽  
Dong Fang Du ◽  
Guo Ping Li ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Solution Treatment ◽  
Tensile Tests ◽  
Treatment Temperature ◽  
Solution Treatment Temperature ◽  
Super Duplex Stainless Steel ◽  
Phase Precipitation ◽  
Σ Phase ◽  
Solution Treated

Effect of solution treated temperature at 5001100°C on ferrite/austenite ratio and σ phase precipitation has been studied in this paper, and the tensile properties after solution treatment at 950°C and 1050°C is compared. The results shows that the ferrite/austenite ratio treated 1050~1100°C is about 1:1; and the formation of σ phase occurs in the ferrite or at ferrite - austenite boundary. The quantity of the σ phase precipitation increases firstly and then decreases with increase of the solution treatment temperature, reaching the maximum at 900°C, and disperse at above 1050°C. Tensile tests show that the fracture is brittle divided and stretched by ductile belt at 950°C, and ductile at 1050°C.

scholarly journals Influence of Solution Treatment Temperature on Microstructural Properties of an Industrially Forged UNS S32750/1.4410/F53 Super Duplex Stainless Steel (SDSS) Alloy

Metals ◽  
2017 ◽  
Vol 7 (6) ◽  
pp. 210 ◽  
Author(s):  
Vasile Cojocaru ◽  
Nicolae Șerban ◽  
Mariana Angelescu ◽  
Mihai Cotruț ◽  
Elisabeta Cojocaru ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Solution Treatment ◽  
Treatment Temperature ◽  
Solution Treatment Temperature ◽  
Microstructural Properties ◽  
Super Duplex Stainless Steel

Effect of solution treatment temperature on the precipitation kinetic of σ-phase in 2205 duplex stainless steel welds

2008 ◽  
Vol 496 (1-2) ◽  
pp. 447-454 ◽  
Author(s):  
R. Badji ◽  
M. Bouabdallah ◽  
B. Bacroix ◽  
C. Kahloun ◽  
K. Bettahar ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Solution Treatment ◽  
Treatment Temperature ◽  
Precipitation Kinetic ◽  
Solution Treatment Temperature ◽  
Σ Phase ◽  
2205 Duplex Stainless Steel ◽  
Steel Welds

Microstructure Evolution and σ-Phase Precipitation Kinetics of 2507 Duplex Stainless Steel Aging at 850°C

2013 ◽  
Vol 711 ◽  
pp. 87-90
Author(s):  
Yin Hui Yang
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Aging Time ◽  
Solution Treatment ◽  
Treatment Temperature ◽  
Solution Treatment Temperature ◽  
Phase Precipitation ◽  
Σ Phase ◽  
Phase Precipitate ◽  
Δ Ferrite

A commercial 2507 duplex stainless steel with different solution treatments followed by aging at 850°C has been investigated. At the early aging time of 850°C, the σ-phase precipitate was predominantly distributed at the δ/γ interface, as the isothermal aging time was increased to 150 min, more σ-phase precipitate formed in ferrite and became coarser by a eutectoid reaction δσ+γ2. The amount of δ-ferrite decreased rapidly at the beginning of aging for 80 minutes, increasing solution treatment temperature from 1060°C to 1230°C delayed decomposition of δ-ferrite due to lowering σ-phase formation element (Cr). The reaction rate K and σ-phase precipitation rate were lowered by increasing solution treatment temperature from 1060°C to 1230°C.

Effect of Heat Treatment Temperature and Lubricating Conditions on the Fretting Wear Behavior of SAF 2507 Super Duplex Stainless Steel

2019 ◽  
Vol 141 (10) ◽  
Author(s):  
Mengjiao Wang ◽  
Yunxia Wang ◽  
Jianzhang Wang ◽  
Na Fan ◽  
Fengyuan Yan
Keyword(s):  
Heat Treatment ◽  
Stainless Steel ◽  
Wear Resistance ◽  
Duplex Stainless Steel ◽  
Wear Behavior ◽  
Treatment Temperature ◽  
Fretting Wear ◽  
Super Duplex Stainless Steel ◽  
Wear Performance ◽  
Seawater Lubrication

Super duplex stainless steel (SDSS) has excellent mechanical properties and corrosion resistance. However, currently, there are few researches conducted on its fretting wear performance. This paper studies the influence of different heat treatment temperatures and medium environment on the fretting wear performance of SAF 2507 SDSS. Results show that the combined effect of the sigma phase and seawater lubrication can significantly improve the wear resistance of SAF 2507 SDSS. After treated with different heat treatment temperatures, different contents of sigma phases are precipitated out of SAF 2507 SDSS, which improves the wear resistance of the material to different degrees. In addition, the fretting wear performance of SAF 2507 SDSS also relates to the lubrication medium. In air, the friction and wear performance of SAF 2507 SDSS is poor, while in seawater, solution and corrosion products that acted as a lubricant dramatically improve the wear resistance of the material. Under the combined action of heat treatment and seawater lubrication medium, the friction coefficient and wear reduce by 70% and 91%, respectively.

Effect of W and Ce additions on the electrochemical corrosion behaviour of 444-type ferritic stainless steel

2018 ◽  
Vol 53 (3) ◽  
pp. 199-205 ◽  
Author(s):  
Mingyu Ma ◽  
Chunlin He ◽  
Liqing Chen ◽  
Liangliang Wei ◽  
Raja Devesh Kumar Misra
Keyword(s):  
Stainless Steel ◽  
Ferritic Stainless Steel ◽  
Corrosion Behaviour ◽  
Electrochemical Corrosion ◽  
Electrochemical Corrosion Behaviour
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