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Time-temperature-precipitation and property diagrams for super duplex stainless steel weld metals
University West, Department of Engineering Science, Division of Welding Technology. Innovatum AB.,Trollhättan, Trollhättan, Sweden.ORCID iD: 0000-0001-6242-3517
University West, Department of Engineering Science, Division of Welding Technology. (PTW)ORCID iD: 0000-0001-8822-2705
The University of Manchester, School of Materials,Manchester,UK.
University West, Department of Engineering Science, Division of Welding Technology.ORCID iD: 0000-0001-5110-449X
2018 (English)In: Welding in the World, ISSN 0043-2288, E-ISSN 1878-6669Article in journal (Refereed) Epub ahead of print
Abstract [en]

Super duplex stainless steel (SDSS) weld metal microstructures, covering the complete temperature range from ambient to liquidus, were produced by arc heat treatment for 1 and 10 min. Temperature modeling and thermodynamic calculations complemented microstructural studies, hardness mapping and sensitization testing. After 1 min, intermetallics such as sigma and chi phase had precipitated, resulting in moderate sensitization at 720–840 °C. After 10 min, larger amounts of intermetallics resulted in hardness up to 400 HV0.5 and more severe sensitization at 580–920 °C. Coarse and fine secondary austenite precipitated at high and low temperatures, respectively: The finer secondary austenite was more detrimental to corrosion resistance due to its lower content of Cr, Mo, and N as predicted by thermodynamic calculations. Increased hardness and etching response suggest that 475 °C embrittlement had occurred after 10 min. Results are summarized as time-temperature-precipitation and property diagrams for hardness and sensitization.

Place, publisher, year, edition, pages
2018.
Keyword [en]
Super duplex stainless steel, Weld metal, Time-temperature-precipitation diagram, Sensitization, Hardness, Sigma phase, Stationary arc, Heat treatment, Secondary austenite
National Category
Manufacturing, Surface and Joining Technology
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
URN: urn:nbn:se:hv:diva-12054DOI: 10.1007/s40194-018-0548-zOAI: oai:DiVA.org:hv-12054DiVA: diva2:1181066
Note

First Online: 17 January 2018

Available from: 2018-02-07 Created: 2018-02-07 Last updated: 2018-02-07Bibliographically approved

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Hosseini, VahidKarlsson, LeifWessman, Sten

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