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Predicting ferrite fractions in single pass super duplex stainless steel welds: thermal cycle analysis and phase transformation modeling
University West, Department of Engineering Science, Division of Welding Technology. (PTW)ORCID iD: 0000-0001-6242-3517
University West, Department of Engineering Science, Division of Welding Technology. (PTW)ORCID iD: 0000-0001-5110-449X
University West, Department of Engineering Science, Division of Welding Technology. (PTW)ORCID iD: 0000-0002-0234-3168
University West, Department of Engineering Science, Research Enviroment Production Technology West. University West, Department of Engineering Science, Division of Welding Technology. (PTW)ORCID iD: 0000-0001-8822-2705
2019 (English)In: ESSC and DUPLEX 2019: 10th European Stainless Steel Conference - Science and Market, 6th European Duplex Stainless Steel Conference and Exhibition, Wien: Austrian Society for Metallurgy and Materials (ASMET) , 2019, p. 180-197Conference paper, Published paper (Refereed)
Abstract [en]

The relationship between welding process parameters, welding thermal cycle, and the final microstructure is of great importance for reliable fabrication of welded super duplex stainless steels (SDSS) structures. The present study was primarily aimed at investigating the relationship for root/single pass welding of type 2507 SDSS. Fourteen welds were produced using GMAW, GTAW, SAW, and SMAW with different joints geometries, plate thicknesses, and welding parameters. Thermal cycles were recorded using several thermocouples attached to the plates and thermocouples were also harpooned into the weld pool. Weld pool geometries and base metal dilution in the weld metal were determined for all welds. The general trend was that the ferrite fraction of the weld zone increased with increasing cooling rate and base metal dilution in the weld metal. The ferrite fraction was in the range 49-64% for all welds. Kinetics of austenite formation was modeled using computational thermodynamics (Thermo-Calc & DICTRA) to predict the ferrite fractions in the weld zone and calculated fractions were in good agreement with experimental results. Some conflicting results showed that in addition to dilution and cooling rate, the possible nitrogen loss must be taken into account when evaluating and predicting ferrite fraction. It was concluded that the above approach can be used for prediction of the ferrite fraction of super duplex stainless steel single pass welds. Â 2019 ESSC and DUPLEX 2019 - 10th European Stainless Steel Conference - Science and Market, 6th European Duplex Stainless Steel Conference and Exhibition. All rights reserved.

Place, publisher, year, edition, pages
Wien: Austrian Society for Metallurgy and Materials (ASMET) , 2019. p. 180-197
Keywords [en]
Commerce; Cooling; Electric arc welding; Electric welding; Ferrite; Forecasting; Metals; Nickel steel; Phase transitions; Plates (structural components); Thermal cycling; Thermocouples; Welds, Computational thermodynamics; Dictra; Ferrite fraction; Kinetics of austenite formation; Simulation; Super duplex stainless steel; Welding process parameters; Welding thermal cycles, Duplex stainless steel
National Category
Manufacturing, Surface and Joining Technology
Research subject
Production Technology; ENGINEERING, Manufacturing and materials engineering
Identifiers
URN: urn:nbn:se:hv:diva-15015Scopus ID: 2-s2.0-85079330776OAI: oai:DiVA.org:hv-15015DiVA, id: diva2:1395707
Conference
10th European Stainless Steel Conference - Science and Market, ESSC 2019 and 6th European Duplex Stainless Steel Conference and Exhibition, DUPLEX 2019; Vienna; Austria; 30 September 2019 through 2 October 2019
Funder
Vinnova, 2016-02834Available from: 2020-02-24 Created: 2020-02-24 Last updated: 2020-02-24Bibliographically approved

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Hosseini, VahidWessman, StenHurtig, KjellKarlsson, Leif

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