Secondary Phases Precipitation in the 2510 Duplex Stainless Steel

2009 ◽  
Vol 1242 ◽  
Author(s):  
Arturo Reyes ◽  
Irene Calliari ◽  
Emilio Ramous ◽  
Michela Zanellato ◽  
Mattia Merlin
Keyword(s):  
Stainless Steel ◽  
Stainless Steels ◽  
Sigma Phase ◽  
Secondary Phases ◽  
Heat Treated ◽  
Duplex Steel ◽  
Super Duplex Stainless Steels ◽  
History Of ◽  
Short Times ◽  
Steel Heat

ABSTRACTA lot of duplex and super duplex stainless steels are prone to secondary phases but with different sequence and kinetic which depend on the chemical composition and thermo-mechanical history of the steel. In this paper the results of secondary phase's determination in a welding grade 2510 duplex steel, heat treated at 850–1050°C for 3–30 min are presented. The precipitation stars at grain boundaries with a consistent ferrite transformation for short times. The noses of the TTP curves are at 1000°C (sigma phase) and at 900°C (chi phase) with a partial transformation of chi to sigma, as evidenced in 2205 and 2507 grades.

scholarly journals Investigation on Solid State Phase Transformations in a 2510 Duplex Stainless Steel Grade

2020 ◽  
Author(s):  
Irene Calliari ◽  
Marco Breda ◽  
Claudio Gennari ◽  
Luca Pezzato ◽  
Massimo Pellizzari ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Secondary Phase ◽  
Secondary Phases ◽  
Phase Precipitation ◽  
Heat Treated ◽  
Super Duplex Stainless Steels ◽  
Short Times ◽  
Stainless Steel Heat ◽  
Steel Heat

Duplex and Super Duplex Stainless Steels are very prone to secondary phases formation related to ferrite decomposition at high temperatures. In the present paper the results on secondary phase precipitation in a 2510 Duplex Stainless Steel, heat treated in the temperature range 850-1050 °C for 3-30 minutes are presented. The precipitation starts at grain boundaries with a consistent ferrite transformation for very short times. The noses of the TTP curves are at 1000 °C for σ-phase and at 900 °C for χ-phase, respectively. The precipitation sequence involves a partial transformation of χ into σ, as previously evidenced in 2205 and 2507 grades. Furthermore, the experimental data were compared to the results of Thermo-Calc calculations.

scholarly journals Advanced Mechanical Strength in Post Heat Treated SLM 2507 at Room and High Temperature Promoted by Hard/Ductile Sigma Precipitates

Metals ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 199 ◽  
Author(s):  
Kamran Saeidi ◽  
Sajid Alvi ◽  
Frantisek Lofaj ◽  
Valeri Ivanov Petkov ◽  
Farid Akhtar
Keyword(s):  
Tensile Strength ◽  
Stainless Steel ◽  
Mechanical Strength ◽  
Sigma Phase ◽  
Heat Treating ◽  
Tribological Behaviour ◽  
Wear Properties ◽  
Slow Cooling ◽  
Heat Treated ◽  
Duplex Steel

Duplex stainless steel, 71 wt.% austenite, 13 wt.% ferrite and 16 wt.% sigma, was made upon heat treating of fully ferritic as-built selective laser melted (SLM) 2507 stainless steel at 1200 °C. Formation of sigma phase in the heat treated SLM 2507 was investigated using optical microscopy and scanning electron microscopy (SEM). The heat treated SLM 2507 demonstrated a yield strength of 686 MPa, ultimate tensile strength of 920 MPa and an elongation of 1.8% at room temperature with a brittle fracture morphology. Precipitation of sigma phase during heat treatment and slow cooling improved the mechanical and wear properties at high temperatures (1200 °C and 800 °C, respectively). The tensile strength and elongation of the heat treated SLM 2507 was measured 400 MPa and 20% as compared to casted duplex steel with 19 MPa and 30% elongation at 1200 °C. The 20 times higher mechanical strength as compared to casted duplex steel was attributed to sigma precipitates. Tribological behaviour of heat treated duplex SLM 2507 containing sigma at 800 °C showed very low wear rate of 4.5 × 10−5 mm3/mN compared to casted duplex steel with 1.6 × 10−4 mm3/mN.

Influence of Aging Time on the Tensile Strenght of a Duplex Stainless Steel

2014 ◽  
Vol 805 ◽  
pp. 210-214
Author(s):  
G.S. Machado ◽  
M.L.N.M. Melo ◽  
C.A. Rodrigues
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Sigma Phase ◽  
Tensile Tests ◽  
Heat Treated ◽  
Duplex Steel ◽  
Saf 2205 ◽  
Precipitation Phase ◽  
Tensile Test Data ◽  
Do So

This article was aimed at studying the influence of different aging times during the precipitation phase of the UNS S31803 (SAF 2205) duplex steel. To do so, all the test specimens were solution heat treated at 1050oC for 1 hour and quenched in water. After this step, the samples were aged at 850°C for periods of 10, 60 and 600 minutes and cooled in water. The aging heat treatments (TT) were performed in order to precipitate the sigma phase. Samples were subjected to microhardness and tensile tests so that the influence of the microstructural changes over the mechanical properties of the steel was assessed. Based on the microhardness and tensile test data, it was possible to verify a significant change over the mechanical properties of the UNS S31803 steel.

scholarly journals Investigation on Solid-State Phase Transformations in a 2510 Duplex Stainless Steel Grade

Metals ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 967
Author(s):  
Irene Calliari ◽  
Marco Breda ◽  
Claudio Gennari ◽  
Luca Pezzato ◽  
Massimo Pellizzari ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Secondary Phase ◽  
Secondary Phases ◽  
Phase Precipitation ◽  
Σ Phase ◽  
Heat Treated ◽  
Key Factor ◽  
Super Duplex Stainless Steels ◽  
Welding Processes

Duplex and Super Duplex Stainless Steels are very prone to secondary phases formation related to ferrite decomposition at high temperatures. In the present paper the results on secondary phase precipitation in a 2510 Duplex Stainless Steel, heat-treated in the temperature range 850–1050 °C for 3–30 min are presented. The precipitation starts at grain boundaries with a consistent ferrite transformation for very short times. The noses of the Time–Temperature–Precipitation (TTP) curves are at 1000 °C for σ-phase and at 900 °C for χ-phase, respectively. The precipitation sequence involves a partial transformation of χ into σ, as previously evidenced in 2205 and 2507 grades. Furthermore, the experimental data were compared to the results of Thermo-Calc calculations. Understanding and ability to predict phase stability in 2510 duplex stainless steel is a key factor to design optimal welding processes that avoid any secondary phase precipitation in the weld bead as well as in the heat-affected zone.

scholarly journals Erratum to: Intergranular Corrosion Behavior of 304LN Stainless Steel Heat Treated at 623 K (350 °C)

2013 ◽  
Vol 44 (7) ◽  
pp. 3419-3419 ◽  
Author(s):  
Raghuvir Singh ◽  
Mukesh Kumar ◽  
Mainak Ghosh ◽  
Gautam Das ◽  
P. K. Singh ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Corrosion Behavior ◽  
Intergranular Corrosion ◽  
Heat Treated ◽  
304Ln Stainless Steel ◽  
Stainless Steel Heat ◽  
Steel Heat

Internal Friction Influenced by Hydrogen in Super Duplex Stainless Steels

2005 ◽  
Vol 502 ◽  
pp. 345-350
Author(s):  
Toshio Kuroda ◽  
Katsuyuki Nakade ◽  
Kenji Ikeuchi
Keyword(s):  
Internal Friction ◽  
Stainless Steels ◽  
Sigma Phase ◽  
Peak Height ◽  
Phase Precipitation ◽  
Internal Friction Peak ◽  
Hydrogen Charging ◽  
Super Duplex Stainless Steels ◽  
Two Peaks ◽  
Friction Analysis

The influence of microstructure concerning sigma phase on hydrogen behavior was investigated by means of internal friction analysis. After hydrogen charging, a sharp significant internal friction peak by hydrogen in austenite of as-received specimen was observed at 245K for a frequency of 1.5Hz. However, the peak height in the specimen precipitated significant sigma phase was substantially lower than in as-received specimen since hydrogen in austenite have a concentration lower by sigma phase precipitation. In addition, the broadening and scattering of the internal friction peak was clearly identified by interaction between hydrogen and sigma phase. It means that the two peaks associated with hydrogen in the both sigma phase and austenite were considered to be overlapped. Consequently, it was clearly confirmed that hydrogen entered in the sigma phase lattice and hydrogen was also trapped at sigma/austenite interfaces.

scholarly journals Effect of annealing temperature on the microstructure of hyperduplex stainless steels

2019 ◽  
Vol 20 (2) ◽  
pp. 1-6
Author(s):  
Doris Ivette Villalobos Vera ◽  
Ivan Mendoza Bravo
Keyword(s):  
Stainless Steels ◽  
Sigma Phase ◽  
Annealing Temperature ◽  
Secondary Phase ◽  
Heat Treatments ◽  
Secondary Phases ◽  
Annealing Heat Treatment ◽  
Secondary Austenite ◽  
Conventional Annealing ◽  
Annealing Heat

Samples of hyperduplex stainless steels were produced experimentally and exposed to different conventional annealing heat treatments in order to obtain the microstructural balance of 50% ferrite and 50% austenite. To differentiate the ferrite and austenite from any secondary phase, selective etching was used and quantitative metallography was performed to measure the percentage of phases. Results showed that conventional annealing heat treatments promote the transformation from ferrite to sigma phase and secondary austenite, suggesting a higher occurrence of sigma phase in the experimental hyperduplex alloys compared to other duplex alloys due to the superior content of chromium and molybdenum. On the other hand, a balanced microstructure free of secondary phases was accomplished increasing the temperature of the annealing heat treatment, which allowed the transformation of ferrite into austenite during cooling.

FIRTH VICKERS F.V. 520

Alloy Digest ◽  
1959 ◽  
Vol 8 (2) ◽  
Keyword(s):  
Heat Treatment ◽  
Fracture Toughness ◽  
Tensile Strength ◽  
Stainless Steel ◽  
Stainless Steels ◽  
Heat Treating ◽  
Temperature Performance ◽  
Heat Treated ◽  
Temperature Heat ◽  
Temperature Heat Treatment

Abstract Firth-Vickers FV.520 is a chromium-nickel stainless steel that can be hardened by a low temperature heat treatment or supplied in a heat-treated, tough, but machinable condition with a tensile strength of 140,000 psi. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness, creep, and fatigue. It also includes information on low and high temperature performance, and corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: SS-84. Producer or source: Firth-Vickers Stainless Steels Ltd.

scholarly journals Austenitic-ferritic stainless steel containing niobium

2013 ◽  
Vol 66 (4) ◽  
pp. 467-471
Author(s):  
André Itman Filho ◽  
Wandercleiton da Silva Cardoso ◽  
Leonardo Cabral Gontijo ◽  
Rosana Vilarim da Silva ◽  
Luiz Carlos Casteletti
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Charge Transfer ◽  
Ferritic Stainless Steel ◽  
Stainless Steels ◽  
Sigma Phase ◽  
Charge Transfer Resistance ◽  
Chemical Compositions ◽  
Transfer Resistance ◽  
Ferritic Stainless Steels

The austenitic-ferritic stainless steels present a better combination of mechanical properties and stress corrosion resistance than the ferritic or austenitic ones. The microstructures of these steels depend on the chemical compositions and heat treatments. In these steels, solidification starts at about 1450ºC with the formation of ferrite, austenite at about 1300ºC and sigma phase in the range of 600 to 950ºC.The latter undertakes the corrosion resistance and the toughness of these steels. According to literature, niobium has a great influence in the transformation phase of austenitic-ferritic stainless steels. This study evaluated the effect of niobium in the microstructure, microhardness and charge transfer resistance of one austenitic-ferritic stainless steel. The samples were annealed at 1050ºC and aged at 850ºC to promote formation of the sigma phase. The corrosion testes were carried out in artificial saliva solution. The addition of 0.5% Nb in the steel led to the formation of the Laves phase.This phase, associated with the sigma phase, increases the hardness of the steel, although with a reduction in the values of the charge transfer resistance.

GIBSON TUBE DUPLEX ALLOY 19D

Alloy Digest ◽  
2002 ◽  
Vol 51 (1) ◽  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Austenitic Stainless Steel ◽  
Physical Properties ◽  
Tensile Properties ◽  
Stainless Steels ◽  
Chromium Content ◽  
Development Program ◽  
Duplex Alloy ◽  
Super Duplex Stainless Steels

Abstract Alloy 19D (UNS S32001), Nitronic 19D, is a lean duplex (ferritic-austenitic) stainless steel developed by AK Steel. Compared to conventional duplex and super-duplex stainless steels, alloy 19D has a reduced chromium content, man-ganese is substituted for most of the nickel, and molybdenum is essentially eliminated. Gibson Tube conducted a development program to produce seam-welded 19D tubing. This datasheet provides information on composition, physical properties, microstructure, hardness, elasticity, and tensile properties as well as fatigue. It also includes information on corrosion resistance. Filing Code: SS-841. Producer or source: Gibson Tube.

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