σ-phase morphologies and their effect on mechanical properties of duplex stainless steels

Mechanical properties, such as hardness and impact toughness, of ferrite-containing stainless steels are greatly affected by long-term aging at intermediate temperatures. It is known that the α-α′ spinodal decomposition occurring in the iron–chromium-based ferrite is responsible for this aging susceptibility. This decomposition can be characterized unambiguously by atom probe analysis, allowing comparison both with the existing theories of spinodal decomposition and the evolution of some mechanical properties. It is then possible to predict the evolution of hardness of industrial components during service, based on the detailed knowledge of the involved aging process.

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Effect of root pass filler metal on microstructure and mechanical properties in the multi-pass welding of duplex stainless steels

The International Journal of Advanced Manufacturing Technology ◽

10.1007/s00170-017-1412-9 ◽

2017 ◽

Vol 95 (9-12) ◽

pp. 3215-3225 ◽

Cited By ~ 1

Author(s):

Ahmed Kellai ◽

Azzedine Lounis ◽

Sami Kahla ◽

Brahim Idir

Keyword(s):

Mechanical Properties ◽

Stainless Steels ◽

Filler Metal ◽

Duplex Stainless Steels ◽

Microstructure And Mechanical Properties

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Examination of the Orientation Relationships between the Main Phases of Duplex Stainless Steel by EBSD

Materials Science Forum ◽

10.4028/www.scientific.net/msf.537-538.297 ◽

2007 ◽

Vol 537-538 ◽

pp. 297-302

Author(s):

Tibor Berecz ◽

Péter János Szabó

Keyword(s):

Stainless Steel ◽

Duplex Stainless Steel ◽

Stainless Steels ◽

Electron Backscatter Diffraction ◽

Duplex Stainless Steels ◽

Alloying Elements ◽

Orientation Relationships ◽

Σ Phase ◽

Electron Backscatter ◽

Backscatter Diffraction

Duplex stainless steels are a famous group of the stainless steels. Duplex stainless steels consist of mainly austenitic and ferritic phases, which is resulted by high content of different alloying elements and low content of carbon. These alloying elements can effect a number of precipitations at high temperatures. The most important phase of these precipitation is the σ-phase, what cause rigidity and reduced resistance aganist the corrosion. Several orientation relationships have been determined between the austenitic, ferritic and σ-phase in duplex stainless steels. In this paper we tried to verify them by EBSD (electron backscatter diffraction).

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Characterization of Dissimilar Welded Joints Between Austenitic and Duplex Stainless Steel Grades for Liquid Tank Applications

Volume 6A: Materials and Fabrication ◽

10.1115/pvp2018-84997 ◽

2018 ◽

Author(s):

G. Ubertalli ◽

M. Ferraris ◽

P. Matteis ◽

D. Di Saverio

Keyword(s):

Mechanical Properties ◽

Stainless Steel ◽

Austenitic Stainless Steel ◽

Stainless Steels ◽

Welded Joints ◽

Industrial Applications ◽

Duplex Stainless Steels ◽

Steel Pipes ◽

Steel Grades ◽

Welding Processes

Lean duplex stainless steels have similar corrosion and better mechanical properties than the austenitic grades, which ensure their extensive spreading in industrial applications as a substitute of austenitic grades. In the construction of liquid tanks, however, it is often necessary to weld such steels with a range of fittings which are commonly fabricated with austenitic stainless steel grades. Therefore, this paper examines dissimilar welded joints between LDX 2101 (or X2CrMnNiN22-5-2) lean duplex stainless steels plates and austenitic stainless steel pipes, carried out by different arc welding processes. The investigation focuses on the correlation between the welding procedures and the microstructural and mechanical properties of the welded joints.

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