Precipitation of chromium nitride nano-rods on lamellar carbides along austenite-ferrite boundaries in super duplex stainless steel

2017 ◽  
Vol 127 ◽  
pp. 45-48 ◽  
Author(s):  
X.Z. Liang ◽  
M.F. Dodge ◽  
W. Liang ◽  
H.B. Dong
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Chromium Nitride ◽  
Super Duplex Stainless Steel ◽  
Nano Rods

scholarly journals Formation of Chromium Nitride and Intragranular Austenite in a Super Duplex Stainless Steel

2019 ◽  
Vol 50 (12) ◽  
pp. 5594-5601 ◽  
Author(s):  
N. Holländer Pettersson ◽  
D. Lindell ◽  
F. Lindberg ◽  
A. Borgenstam
Keyword(s):  
Heat Treatment ◽  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Chromium Nitride ◽  
Electron Diffraction Data ◽  
Austenite Formation ◽  
Super Duplex Stainless Steel ◽  
Chromium Nitrides ◽  
Nitride Formation ◽  
Secondary Austenite

Abstract Precipitation of chromium nitrides and formation of intragranular austenite were studied in detail for the super duplex stainless steel grade 2507 (UNS S32750). The situation of multipass welding was simulated by heat treatment at 1623 K (1350 °C) and quenching followed by short heat treatments at 1173 K (900 °C). The microstructural evolution was characterized using transmission and scanning electron microscopy, electron backscatter, and transmission Kikuchi diffraction, and it was observed that the interior of the ferrite grains contained chromium nitrides after quenching. The nitrides were predominantly of CrN with a cubic halite-type structure and clusters of CrN-Cr2N where rod-shaped trigonal Cr2N particles had nucleated on plates of CrN. After heat treatment for 10 seconds at 1173 K (900 °C), the nitride morphology was transformed into predominantly rod-shaped Cr2N, and finely dispersed intragranular secondary austenite idiomorphs had formed in the nitride-containing areas within the ferrite grains. After 60 seconds of heat treatment, both the Cr2N nitrides and the secondary austenite were coarsened. Analysis of electron diffraction data revealed an inherited crystallographic relationship between the metastable CrN and the intragranular austenite. The mechanism of chromium nitride formation and its relation to secondary austenite formation in duplex stainless steels are discussed.

scholarly journals Characteristics of Flakes Stacked Cr2N with Many Domains in Super Duplex Stainless Steel

Crystals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 965
Author(s):  
Po-Chiang Lin ◽  
Yu-Ting Tsai ◽  
Neng-Hao Gan ◽  
Jer-Ren Yang ◽  
Shing-Hoa Wang ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Nucleation And Growth ◽  
Chromium Nitride ◽  
Super Duplex Stainless Steel

This study mainly observed the Cr2N (chromium nitride) nucleation and growth in SAF 2507 duplex stainless steel. However, the investigation revealed that Cr2N has a complex substructure separated into many regions. In SAF 2507 duplex stainless steel, Cr2N nucleated at the dislocations and the precipitates were composed of many Cr2N flakes gathered together when aged at 600 °C.

ZERON 100

Alloy Digest ◽  
1993 ◽  
Vol 42 (11) ◽  
Keyword(s):  
Fracture Toughness ◽  
Stainless Steel ◽  
Corrosion Resistance ◽  
High Temperature ◽  
Duplex Stainless Steel ◽  
Heat Treating ◽  
Super Duplex Stainless Steel ◽  
Corrosion Performance ◽  
Temperature Performance ◽  
Offshore Oil

Abstract ZERON 100 is a super duplex stainless steel which is manufactured to give a guaranteed corrosion performance by using an equation to control the chemistry in those elements which will determine the corrosion resistance of the material. Major usages in seawater applications, particularly offshore oil gathering systems. This datasheet provides information on composition, hardness, and tensile properties as well as fracture toughness. It also includes information on low and high temperature performance as well as heat treating, machining, and joining. Filing Code: SS-555. Producer or source: Weir Material Services Ltd.

Experimental investigation on dissimilar weld between super duplex stainless steel 2507 and API X70 pipeline steel

2021 ◽  
pp. 146442072110130
Author(s):  
Waris N Khan ◽  
Rahul Chhibber
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Pipeline Steel ◽  
High Strength ◽  
Super Duplex Stainless Steel ◽  
Shielded Metal Arc Welding ◽  
Electrode Coating ◽  
Dissimilar Weld ◽  
Metal Arc Welding ◽  
Welding Electrode

This work investigates the microstructure and mechanical properties of 2507 super duplex stainless steel and API X70 high strength low alloy steel weld joint. This joint finds application in offshore hydrocarbon drilling riser and oil–gas pipelines. Coated shielded metal arc welding electrodes have been designed and extruded on 309L filler and their performance compared with a commercial austenitic electrode E309L. Filler 309L solidifies in ferrite-austenite (F-A) mode with a resultant microstructure comprising skeletal ferrites with austenite distributed in the interdendritic region. Results of tensile and impact tests indicate that weld fabricated with laboratory-developed electrodes has higher ductility and impact energy than the commercial electrode. The tensile strength and weld hardness of commercial electrodes are superior. The laboratory-made electrode’s microhardness is lower than the commercial electrodes, making the former less prone to failure. An alternative welding electrode coating composition has been suggested through this work and found to be performing satisfactorily and comparable to the commercially available electrodes.

On the Precipitation of Sigma and Chi Phases in a Cast Super Duplex Stainless Steel

2019 ◽  
Vol 50 (10) ◽  
pp. 4758-4778 ◽  
Author(s):  
R. O. Sousa ◽  
P. Lacerda ◽  
P. J. Ferreira ◽  
L. M. M. Ribeiro
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Super Duplex Stainless Steel

Effect of aging of 2507 super duplex stainless steel on sliding tribocorrosion in chloride solution

Wear ◽  
2017 ◽  
Vol 380-381 ◽  
pp. 251-259 ◽  
Author(s):  
J. Michael Shockley ◽  
Derek J. Horton ◽  
Kathryn J. Wahl
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Chloride Solution ◽  
Super Duplex Stainless Steel
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