Microstructure Evolution and Precipitation Modeling in Ni-Based Alloy C-263

Stojan Vujic; S.F. Di Martino; Susanna Matera; Oriana Tassa; Simon Hogg; Joanna Zurek; Coline Beal; Christof Sommitsch

doi:10.4028/www.scientific.net/MSF.783-786.2219

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HomeMaterials Science ForumMaterials Science Forum Vols. 783-786Microstructure Evolution and Precipitation...

Microstructure Evolution and Precipitation Modeling in Ni-Based Alloy C-263

Abstract:

Due to its high creep strength and oxidation resistance, C-263 is a promising Ni-based alloy for applications in superheater tubes in coal fired thermal power plants. The creep strength is mostly based on finely distributed gamma-prime precipitates. In this work, the microstructural evolution of this material during heat treatment and thermal ageing has been investigated. The investigations were carried out by Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), Selected Area Diffraction Pattern (SADP) and Energy Dispersive Spectroscopy (EDS). Besides, equilibrium and Scheil calculations were carried out using the thermodynamic software MatCalc to analyze the stable phases and the solidification process, respectively. Precipitation calculations during solution annealing and subsequent ageing at 700°C and 750°C up to 10.000h ageing time were performed to predict the phase fraction and precipitates radius. SEM and TEM investigations of aged specimens revealed three different precipitates: M₂₃C₆, γ’ and MX. MatCalc also predicted these precipitates. The calculated phase fraction and mean radius show good agreement with experimental data.

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Materials Science Forum (Volumes 783-786)

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2219-2224

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https://doi.org/10.4028/www.scientific.net/MSF.783-786.2219

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May 2014

Authors:

Stojan Vujic*, S.F. Di Martino, Susanna Matera, Oriana Tassa, Simon Hogg, Joanna Zurek, Coline Beal, Christof Sommitsch

Keywords:

C-263, M₂₃C₆, MatCalc, MC, Ni-Based Alloy, Precipitation Kinetics, γ’, η

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