The lean duplex stainless steel welded joint after isothermal aging heat treatment

• Autorzy: Brytan Z. , Niagaj J.
• Języki publikacji: EN

Abstrakty

EN

Purpose: The purpose of this paper is the microstructural evaluation of the lean duplex stainless steel UNS S32101 (EN 1.4162) welded joints after isothermal aging heat treatment at 650°C. The scanning electron microscopy (SEM) and electron backscatter diffraction (EBSD) was applied in the microstructural analysis. Design/methodology/approach: The welding joints were produced using the metal active gas (MAG) method where the filler metal was in wire form grade Avesta LDX 2101. During the process a shielding gas mixture of Ar + 2.5% CO₂ was applied and as a forming gas pure technical argon was used. Findings: The welded joint in the as-welded condition shows Cr2N nitride precipitation in the HAZ, while isothermal aging at 650°C for 15 min causes further precipitation of nitrides, both in the parent metal, as well as in the HAZ and the weld area. Increasing the aging time at this temperature to 90 min causes the formation of numerous nitrides at the grain boundaries of austenite and ferrite and nitride precipitation inside ferritic grains in each zone of the welded joint. Research limitations/implications: The electron backscatter diffraction of particular zones of the welded joints considered only austenite and ferrite and their character was evaluated, while small precipitates like chromium nitrides were omitted in this study and will be evaluated in the further work. Originality/value: Sometimes the production cycle involves the heat treatment of welded components made of lean duplex stainless steel. In such situations the additional heating of the welds and heat affected zone can produce carbides, nitrides or sigma phase precipitation - the extent of which depends on the temperature and time of heat treatment. These issues are widely reported in relation to the base material but not when considering welded joints, which may behave differently.

Słowa kluczowe

EN

welding; heat treatment; stainless steel; duplex steel; chromium nitride

PL

spawalnictwo; obróbka cieplna; stal nierdzewna; stal duplex; azotek chromu

• Wydawca: International OCSCO World Press
• Czasopismo: Archives of Materials Science and Engineering
• Rocznik: 2013
• Tom: Vol. 60, nr 1
• Strony: 24--31
• Opis fizyczny: Bibliogr. 23 poz.

Twórcy

autor

Brytan Z.

• Division of Materials Processing Technology, Management and Computer Techniques in Materials Science, Institute of Engineering Materials and Biomaterials, Silesian University of Technology, ul. Konarskiego 18a, 44-100 Gliwice, Poland

autor

Niagaj J.

• Institute of Welding, ul. Bł. Czesława 16/18, 44-100 Gliwice, Poland

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