Quantification of sigma-phase evolution in thermally aged 2205 duplex stainless steel

A. D. Warren*, R. L. Harniman, Z. Guo, C. M. Younes, P. E J Flewitt, T. B. Scott

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

24 Citations (Scopus)
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Abstract

In this study, the evolution of sigma-phase development in a 2205 duplex steel was studied following thermal ageing in the temperature range 750–850 °C for periods up to 100 h. A suite of materials analysis techniques including combined electron backscatter diffraction–energy-dispersive X-ray imaging and magnetic force microscopy are used to quantify the change in volume fraction of the phases. The experimental results for each ageing condition are compared with the results from other ageing experiments and the predictions from the computer modelling. They show good correlation for the amount of sigma phase formed under a range of ageing conditions (and thus varying quantities of sigma phase). EBSD measurements showed no preferential orientation relationships relative to the parent ferrite for the nucleation of sigma phase, implying that the minimisation of boundary misorientation energy is not significant in determining sigma-phase nucleation sites. The results are discussed with respect to the experimentally measured properties of sigma phase and the kinetics of the precipitation process.

Original languageEnglish
Pages (from-to)694-707
Number of pages14
JournalJournal of Materials Science
Volume51
Issue number2
Early online date3 Nov 2015
DOIs
Publication statusPublished - 1 Jan 2016

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