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High-Temperature Phase Equilibria of Duplex Stainless Steels Assessed with a Novel In-Situ Neutron Scattering Approach
RISE - Research Institutes of Sweden, Swerea, Swerea KIMAB.
RISE - Research Institutes of Sweden, Swerea, Swerea KIMAB.
Outokumpu Stainless Research Foundation, Stockholm, Sweden.
Australian Nuclear Science and Technology Organisation, Kirrawee DC, Australia.
2017 (English)In: Metallurgical and Materials Transactions. A, ISSN 1073-5623, E-ISSN 1543-1940, Vol. 48, no 4, 1562-1571 p.Article in journal (Refereed) Published
Abstract [en]

Duplex stainless steels are designed to solidify with ferrite as the parent phase, with subsequent austenite formation occurring in the solid state, implying that, thermodynamically, a fully ferritic range should exist at high temperatures. However, computational thermodynamic tools appear currently to overestimate the austenite stability of these systems, and contradictory data exist in the literature. In the present work, the high-temperature phase equilibria of four commercial duplex stainless steel grades, denoted 2304, 2101, 2507, and 3207, with varying alloying levels were assessed by measurements of the austenite-to-ferrite transformation at temperatures approaching 1673 K (1400 °C) using a novel in-situ neutron scattering approach. All grades became fully ferritic at some point during progressive heating. Higher austenite dissolution temperatures were measured for the higher alloyed grades, and for 3207, the temperature range for a single-phase ferritic structure approached zero. The influence of temperatures in the region of austenite dissolution was further evaluated by microstructural characterization using electron backscattered diffraction of isothermally heat-treated and quenched samples. The new experimental data are compared to thermodynamic calculations, and the precision of databases is discussed.

Place, publisher, year, edition, pages
2017. Vol. 48, no 4, 1562-1571 p.
Keyword [en]
Austenite, Dissolution, Ferrite, Ferritic steel, Neutron scattering, Phase equilibria, Phase transitions, Temperature, Austenite-to-ferrite transformation, Computational thermodynamics, Dissolution temperature, Duplex stainless steel, Electron back-scattered diffraction, High temperature phase, Micro-structural characterization, Thermodynamic calculations, Stainless steel
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-29327DOI: 10.1007/s11661-016-3953-1ScopusID: 2-s2.0-85009889679OAI: oai:DiVA.org:ri-29327DiVA: diva2:1094976
Available from: 2017-05-11 Created: 2017-05-11 Last updated: 2017-05-11Bibliographically approved

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