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duplex stainless steel
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Book Chapter
Book: Corrosion of Weldments
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2006
DOI: 10.31399/asm.tb.cw.t51820099
EISBN: 978-1-62708-339-3
... Abstract Duplex stainless steels are two-phase alloys based on the iron-chromium-nickel system. Duplex stainless steels offer corrosion resistance and cost advantages over the common austenitic stainless steels. Although there are some problems with welding duplex alloys, considerable progress...
Abstract
Duplex stainless steels are two-phase alloys based on the iron-chromium-nickel system. Duplex stainless steels offer corrosion resistance and cost advantages over the common austenitic stainless steels. Although there are some problems with welding duplex alloys, considerable progress has been made in defining the correct parameters and chemistry modifications for achieving sound welds. This chapter provides a basic understanding of the development, grade designations, microstructure, properties, and general welding considerations of duplex stainless steel. It also discusses the influence of ferrite-austenite balance on corrosion resistance and the influence of different welding conditions on various material properties of alloy 2205 (UNS S31803).
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in Metallurgy of Steels and Related Boiler Tube Materials
> Failure Investigation of Boiler Tubes: A Comprehensive Approach
Published: 01 December 2018
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Published: 01 October 2011
Fig. 12.8 Example of a wrought 2205 duplex stainless steel microstructure. Ferrite, dark; austenite, light. Source: Ref 12.2
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in Stainless Steels
> Metallography of Steels<subtitle>Interpretation of Structure and the Effects of Processing</subtitle>
Published: 01 August 2018
Fig. 16.28 Microstructure of UNS S31803 duplex stainless steel plate rolled and annealed for 30 min at 1050 °C (1920 °F), followed by quenching. Ferrite (dark) and austenite islands (light). The mechanical forming was done inside the two-phase field. Electrolytic etching with 30% (vol) HNO 3
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in Stainless Steels
> Metallography of Steels<subtitle>Interpretation of Structure and the Effects of Processing</subtitle>
Published: 01 August 2018
Fig. 16.31 As-cast ASTM A890/A890M Grade 6A duplex stainless steel. The composition has been adjusted for FA solidification. Austenite (light, dendritic) and interdendritic ferrite. Etchant: Beraha II. Courtesy of M. Martins. (See also Ref 25 ).
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in Stainless Steels
> Metallography of Steels<subtitle>Interpretation of Structure and the Effects of Processing</subtitle>
Published: 01 August 2018
Fig. 16.33 ASTM A890/A890M Grade 6A cast duplex stainless steel annealed at 1100 °C (2010 °F) and quenched. Austenite (light) and ferrite. The annealing temperature defines the volume fraction of the phases present, for each specific chemical composition. Etchant: Beraha II. Courtesy of M
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in Stainless Steels
> Metallography of Steels<subtitle>Interpretation of Structure and the Effects of Processing</subtitle>
Published: 01 August 2018
Fig. 16.34 ASTM A890/A890M Grade 6A cast duplex stainless steel annealed at 980 °C (1795 °F) and quenched. Austenite (light) and ferrite. At this temperature, ferrite decomposes into austenite and sigma phase (σ). Thus, there are two types (and sizes) of austenite: large grains, formed prior
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in Stainless Steels
> Metallography of Steels<subtitle>Interpretation of Structure and the Effects of Processing</subtitle>
Published: 01 August 2018
Fig. 16.35 ASTM A890/A890M Grade 6A cast duplex stainless steel annealed at 960 °C (1760 °F) and quenched. Austenite (light) and ferrite. At this temperature, ferrite decomposes into austenite and sigma phase (σ). Etchant: Beraha II. Courtesy of M. Martins. Source: Ref 26
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in Stainless Steels
> Metallography of Steels<subtitle>Interpretation of Structure and the Effects of Processing</subtitle>
Published: 01 August 2018
Fig. 16.36 ASTM A890/A890M Grade 6A cast duplex stainless steel annealed at 900 °C (1650 °F) and quenched. Austenite (light) and ferrite. At this temperature, ferrite decomposes into austenite and sigma phase (σ). Ferrite is almost absent. (See Figure 16.37 , SEM evaluation). Etchant: Beraha
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in Stainless Steels
> Metallography of Steels<subtitle>Interpretation of Structure and the Effects of Processing</subtitle>
Published: 01 August 2018
Fig. 16.37 ASTM A890/A890M Grade 6A cast duplex stainless steel aged at 920 °C (1690 °F). Austenite and sigma (σ). The larger grains are austenite and the fine structure between the austenite grains is composed of austenite and sigma (σ), probably formed by cooperative growth similar
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in Stainless Steels
> Metallography of Steels<subtitle>Interpretation of Structure and the Effects of Processing</subtitle>
Published: 01 August 2018
Fig. 16.39 ASTM A890/A890M Grade 1C duplex stainless steel (as calculated in Fig. 16.38 ) subjected to an isothermal hold at 880 °C (1615 °F). SEM, SE. Larger austenite grains and finer structure composed of austenite and sigma (σ). Courtesy of M. Martins. Source: Ref 26
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in Stainless Steels
> Metallography of Steels<subtitle>Interpretation of Structure and the Effects of Processing</subtitle>
Published: 01 August 2018
Fig. 16.40 (a) The duplex stainless steel presented in Fig. 16.30 after a 12 h treatment at 750 °C (1380 °F). All ferrite has decomposed into austenite and sigma (σ). Larger austenite grains and finer structure composed of austenite and sigma (including some sigma at larger austenite grain
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in The Art of Revealing Microstructure
> Metallographer’s Guide<subtitle>Practices and Procedures for Irons and Steels</subtitle>
Published: 01 March 2002
Fig. 8.40 An AISI 2205 duplex stainless steel showing austenite (dark constituent) and ferrite. Lichtenegger/Bloech reagent. (a) 500× and (b) 1000×
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Published: 01 January 2015
Fig. 23.31 Microstructure of duplex stainless steel 7-Mo PLUS (UNS S32950). Gray phase is ferrite and white phase is austenite. Etched electrolytically in 20% NaOH. Light micrograph. Courtesy of G. Vander Voort, Carpenter Technology Corp., Reading, PA
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Published: 01 January 2015
Fig. 23.32 Ferrite (F) and austenite (A) grains in duplex stainless steel Al 2205 (UNS S31803). Transmission electron micrograph. Courtesy of S.W. Thompson, Colorado School of Mines, Golden, CO
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Published: 01 January 2015
Fig. 23.33 Stress-strain curves for duplex stainless steel Al 2205 (UNS S31803) as a function of temperature. Source: Ref 23.57
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in Introduction to Steels and Cast Irons
> Metallographer’s Guide<subtitle>Practices and Procedures for Irons and Steels</subtitle>
Published: 01 March 2002
Fig. 1.16 Micrograph of a duplex stainless steel (7Mo Plus) showing a microstructure consisting of ferrite and austenite. The ferrite is the continuous matrix constituent. Electrolytically etched in 10% oxalic acid at 5 V. 200×
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Book Chapter
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.tb.ssde.t52310091
EISBN: 978-1-62708-286-0
... Abstract This chapter provides information on the structure, design aspects, mechanical properties, forming, machining, and corrosion resistance characteristics of duplex stainless steels. The different types of corrosion covered are general corrosion, pitting corrosion, crevice corrosion...
Abstract
This chapter provides information on the structure, design aspects, mechanical properties, forming, machining, and corrosion resistance characteristics of duplex stainless steels. The different types of corrosion covered are general corrosion, pitting corrosion, crevice corrosion, and stress corrosion cracking.
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Published: 01 January 2000
Fig. 24 Pitting potentials for type 316 stainless steel and a duplex stainless steel in deaerated synthetic seawater. Source: Ref 2
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Published: 01 December 2006
Fig. 1 The development of hot-rolled duplex stainless steels in terms of their nitrogen versus chromium plus molybdenum contents. Source: Ref 1
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