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Microstructure and functionality of a uniquely graded super duplex stainless steel designed by a novel arc heat treatment method

Hosseini, Vahid, 1987- (author)
Högskolan Väst,Avdelningen för svetsteknologi (SV),Innovatum AB., Trollhättan, Trollhättan, Sweden,PTW
Karlsson, Leif, 1956- (author)
Högskolan Väst,Avdelningen för svetsteknologi (SV),PTW
Örnek, Cem (author)
KTH,RISE,KIMAB,KTH Royal Institute of Technology, Department of Chemical Science and Engineering, Division of Surface and Corrosion Science, Stockholm, Sweden, Department of Corrosion in Energy and Processing Industry, Swerea KIMAB AB, P.O. Box 7047, Kista, Sweden,Yt- och korrosionsvetenskap,Swerea KIMAB AB
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Reccagni, Pierfrance (author)
The University of Manchester, School of Materials, Manchester, United Kingdom
Wessman, Sten (author)
Högskolan Väst,Avdelningen för svetsteknologi (SV)
Engelberg, Dirk (author)
The University of Manchester, School of Materials, Manchester, United Kingdom
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 (creator_code:org_t)
Elsevier BV, 2018
2018
English.
In: Materials Characterization. - : Elsevier BV. - 1044-5803 .- 1873-4189. ; 139, s. 390-400
  • Journal article (peer-reviewed)
Abstract Subject headings
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  • A novel arc heat treatment technique was applied to design a uniquely graded super duplex stainless steel (SDSS), by subjecting a single sample to a steady state temperature gradient for 10 h. A new experimental approach was used to map precipitation in microstructure, covering aging temperatures of up to 1430 °C. The microstructure was characterized and functionality was evaluated via hardness mapping. Nitrogen depletion adjacent to the fusion boundary depressed the upper temperature limit for austenite formation and influenced the phase balance above 980 °C. Austenite/ferrite boundaries deviating from Kurdjumov–Sachs orientation relationship (OR) were preferred locations for precipitation of σ at 630–1000 °C, χ at 560–1000 °C, Cr2N at 600–900 °C and R between 550 °C and 700 °C. Precipitate morphology changed with decreasing temperature; from blocky to coral-shaped for σ, from discrete blocky to elongated particles for χ, and from polygonal to disc-shaped for R. Thermodynamic calculations of phase equilibria largely agreed with observations above 750 °C when considering nitrogen loss. Formation of intermetallic phases and 475 °C-embrittlement resulted in increased hardness. A schematic diagram, correlating information about phase contents, morphologies and hardness, as a function of exposure temperature, is introduced for evaluation of functionality of microstructures. 

Subject headings

TEKNIK OCH TEKNOLOGIER  -- Materialteknik (hsv//swe)
ENGINEERING AND TECHNOLOGY  -- Materials Engineering (hsv//eng)
TEKNIK OCH TEKNOLOGIER  -- Materialteknik -- Bearbetnings-, yt- och fogningsteknik (hsv//swe)
ENGINEERING AND TECHNOLOGY  -- Materials Engineering -- Manufacturing, Surface and Joining Technology (hsv//eng)

Keyword

475 °C-embrittlement
Chi phase
Functionally graded microstructure
Nitrogen loss
R-phase
Sigma phase
Austenite
Chromium compounds
Cold rolling
Embrittlement
Hardness
Heat treatment
Microstructure
Nitrogen
Nitrogen compounds
Phase equilibria
Schematic diagrams
Stainless steel
Functionally graded microstructures
R phase
Temperature
Manufacturing and materials engineering

Publication and Content Type

ref (subject category)
art (subject category)

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