The influence of solution treatment temperature on microstructure and corrosion behavior of high temperature ageing in 25% Cr duplex stainless steel

2011 ◽  
Vol 509 (36) ◽  
pp. 8870-8879 ◽  
Author(s):  
Y.H. Yang ◽  
B. Yan ◽  
J. Wang ◽  
J.L. Yin
Keyword(s):  
Stainless Steel ◽  
High Temperature ◽  
Duplex Stainless Steel ◽  
Corrosion Behavior ◽  
Solution Treatment ◽  
Treatment Temperature ◽  
Solution Treatment Temperature ◽  
Temperature Ageing

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.

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 Solid Solution Treatment on Corrosive Action of 00Cr26Ni5Mo2Cu3Re Duplex Stainless Steel in Acid Stage

2011 ◽  
Vol 335-336 ◽  
pp. 566-570
Author(s):  
Hong Pu Zhao ◽  
Shun Xing Wang
Keyword(s):  
Solid Solution ◽  
Stainless Steel ◽  
High Temperature ◽  
Low Temperature ◽  
Acid Solution ◽  
Duplex Stainless Steel ◽  
Solution Treatment ◽  
Solution Temperature ◽  
Solid Solution Treatment ◽  
Corrosive Resistance

Effect of solid solution treatment on corrosive behavior of 00Cr26Ni5Mo2Cu3Re Duplex Stainless Steel in static stage of HNO3+HF acid solution is studied in the paper.The results show that the corrosion between phases and pitting corrosion on ferrite are serious at low temperature ,the phenomenon gradually disappear with the solid solution temperature rising ; the corrosive resistance of 00Cr26Ni5Mo2Cu3Re is getting better first and then decrease with solution temperature at high temperature, the best corrosive resistance temperature is at 1050°C.

Effect of high temperature compression deformation strain rate on the microstructure and corrosion behavior of 2205 duplex stainless steel

2015 ◽  
Vol 62 (3) ◽  
pp. 163-171 ◽  
Author(s):  
Yinhui Yang ◽  
Biao Yan
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
High Temperature ◽  
Strain Rate ◽  
Duplex Stainless Steel ◽  
Corrosion Behavior ◽  
Potentiodynamic Polarization ◽  
Phase Interface ◽  
Content Type ◽  
2205 Duplex Stainless Steel

Purpose – The aim of this paper was to investigate the effect of strain rate on microstructure and corrosion behavior of 2205 duplex stainless steel, after high-temperature compression tests. Design/methodology/approach – The specimens were prepared using a Gleeble3800 thermo-simulation machine over a range of temperatures from 850 to 1,250°C and strain rates from 0.005 to 5 s−1, and the corresponding flow curves and deformation microstructure obtained were further analyzed. To evaluate the effect of strain rate on corrosion behavior, potentiodynamic polarization tests and double-loop electrochemical potentiodynamic reactivation (DL-EPR) were used to characterize the electrochemical performance. Findings – Compared with strain rate of 0.5 s−1, the worst corrosion resistance behavior from the potentiodynamic polarization test results after deformation at 0.005 s−1 was attributed to more austenite (γ) and ferrite (δ) grain boundaries or δ/γ phase interface formation due to the better effect of γ dynamic recrystallization (DRX) or δ dynamic recovery (DRV). Increasing strain rate to 5 s−1 lowered the corrosion resistance, due to the increase in dislocation density. At the low strain rate of 0.005 s−1, the susceptibility to intergranular corrosion (IGC) was comparatively high after deformation at 1050 and 1150°C with more γ/γ grains and δ/γ phase boundary formation, which was lowered with the strain rate increase to 0.5 s−1, due to suppressing effect of γ DRX. Originality/value – The paper provides the scientific basis for the practical application of hot working of 2205 duplex stainless steel.

High temperature studies of steels in the photo-emission electron microscope

1978 ◽  
Vol 36 (1) ◽  
pp. 612-613
Author(s):  
B. Burnett ◽  
K.E. Parker ◽  
A.J. Baker
Keyword(s):  
Electron Microscope ◽  
High Temperature ◽  
Solution Treatment ◽  
Treatment Temperature ◽  
Surface Reactivity ◽  
Solution Treatment Temperature ◽  
Emission Electron ◽  
Alloy Steels ◽  
Alloy Carbide ◽  
Metallurgical Reactions

The Photo-Emission Electron Microscope (PEEM) provides a unique facility for the direct examination of high temperature metallurgical reactions. However, considerable experience and care is required in the interpretation of the images obtained since they differ greatly from those produced in other types of electron microscopy. Furthermore, the morphology of products and the rates of reactions may be influenced by the fact that they occur at the free surface of a material. These effects are particularly important in the study of precipitation reactions in steels, where the interpretation of features of the image involves a consideration of the interplay between solute supersaturation, surface orientation and surface reactivity. A Balzers KE3 PEEM has been used to examine the behaviour of a variety of experimental and commercial alloy steels under high temperature conditions.Figure 1 illustrates the precipitation of an alloy carbide from austenite at low supersaturation. The precipitate is V5C6 and has formed at 850°C during cooling at 5°C/min from the 1050° C solution treatment temperature.

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