Modelling and optimizing precipitation in creep resistant austenitic steel 25Cr-20Ni-Nb-N

Vujic Stojan; Beal Coline; Sommitsch Christof; Muhammad Farooq; Sandström Rolf; Zurek Joanna

Modelling and optimizing precipitation in creep resistant austenitic steel 25Cr-20Ni-Nb-N

Vujic Stojan, Beal Coline, Sommitsch Christof, Muhammad Farooq, Sandström Rolf, Zurek Joanna

Graz University of Technology (90000)

Research output: Contribution to conference › Paper › peer-review

Abstract

25Cr-20Ni-Nb-N (Tp310HCbN) steel is a promising austenitic steel for applications in superheater tubes in coal fired thermal power plants due to the high creep strength and oxidation resistance. In this work, the microstructural evolution of this material during heat treatment and thermal ageing has been investigated. The investigations were carried out by Light Optical Microscopy (LOM), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM) and Energy Dispersive Spectroscopy (EDS). Besides, equilibrium and Scheil calculations were carried out using the thermodynamic software MatCalc to analyse the stable phases and the solidification process, respectively. Precipitation calculations during solution annealing and subsequent ageing at 650 and 750°C were performed to predict the phase fraction and precipitates radius up to 10.000h ageing time. SEM and TEM investigations of aged specimens revealed the presence of six different precipitates: M₂₃C ₆, Cr₂N, sigma, Z-phase, eta-phase (Cr₃Ni ₂Si(C,N)) and Nb(C,N). These precipitates were predicted and confirmed by MatCalc simulations. The calculated phase fraction and mean radius show good agreement with experimental data. Finally, simulations of different Cr-, C- and N-content in Tp310HCbN were performed.

Original language	English
Pages	1163-1172
Number of pages	10
Publication status	Published - 1 Jan 2014
Event	7th International Conference on Advances in Materials Technology for Fossil Power Plants - Waikoloa, HI, United States Duration: 22 Oct 2013 → 25 Oct 2013

Conference

Conference	7th International Conference on Advances in Materials Technology for Fossil Power Plants
Country/Territory	United States
City	Waikoloa, HI
Period	22/10/13 → 25/10/13

ASJC Scopus subject areas

Renewable Energy, Sustainability and the Environment
Fuel Technology

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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Modelling and optimizing precipitation in creep resistant austenitic steel 25Cr-20Ni-Nb-N. / Stojan, Vujic; Coline, Beal; Christof, Sommitsch et al.
2014. 1163-1172 Paper presented at 7th International Conference on Advances in Materials Technology for Fossil Power Plants, Waikoloa, HI, United States.

Research output: Contribution to conference › Paper › peer-review

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title = "Modelling and optimizing precipitation in creep resistant austenitic steel 25Cr-20Ni-Nb-N",

abstract = "25Cr-20Ni-Nb-N (Tp310HCbN) steel is a promising austenitic steel for applications in superheater tubes in coal fired thermal power plants due to the high creep strength and oxidation resistance. In this work, the microstructural evolution of this material during heat treatment and thermal ageing has been investigated. The investigations were carried out by Light Optical Microscopy (LOM), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM) and Energy Dispersive Spectroscopy (EDS). Besides, equilibrium and Scheil calculations were carried out using the thermodynamic software MatCalc to analyse the stable phases and the solidification process, respectively. Precipitation calculations during solution annealing and subsequent ageing at 650 and 750°C were performed to predict the phase fraction and precipitates radius up to 10.000h ageing time. SEM and TEM investigations of aged specimens revealed the presence of six different precipitates: M23C 6, Cr2N, sigma, Z-phase, eta-phase (Cr3Ni 2Si(C,N)) and Nb(C,N). These precipitates were predicted and confirmed by MatCalc simulations. The calculated phase fraction and mean radius show good agreement with experimental data. Finally, simulations of different Cr-, C- and N-content in Tp310HCbN were performed.",

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T1 - Modelling and optimizing precipitation in creep resistant austenitic steel 25Cr-20Ni-Nb-N

AU - Stojan, Vujic

AU - Coline, Beal

AU - Christof, Sommitsch

AU - Farooq, Muhammad

AU - Rolf, Sandström

AU - Joanna, Zurek

PY - 2014/1/1

Y1 - 2014/1/1

N2 - 25Cr-20Ni-Nb-N (Tp310HCbN) steel is a promising austenitic steel for applications in superheater tubes in coal fired thermal power plants due to the high creep strength and oxidation resistance. In this work, the microstructural evolution of this material during heat treatment and thermal ageing has been investigated. The investigations were carried out by Light Optical Microscopy (LOM), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM) and Energy Dispersive Spectroscopy (EDS). Besides, equilibrium and Scheil calculations were carried out using the thermodynamic software MatCalc to analyse the stable phases and the solidification process, respectively. Precipitation calculations during solution annealing and subsequent ageing at 650 and 750°C were performed to predict the phase fraction and precipitates radius up to 10.000h ageing time. SEM and TEM investigations of aged specimens revealed the presence of six different precipitates: M23C 6, Cr2N, sigma, Z-phase, eta-phase (Cr3Ni 2Si(C,N)) and Nb(C,N). These precipitates were predicted and confirmed by MatCalc simulations. The calculated phase fraction and mean radius show good agreement with experimental data. Finally, simulations of different Cr-, C- and N-content in Tp310HCbN were performed.

AB - 25Cr-20Ni-Nb-N (Tp310HCbN) steel is a promising austenitic steel for applications in superheater tubes in coal fired thermal power plants due to the high creep strength and oxidation resistance. In this work, the microstructural evolution of this material during heat treatment and thermal ageing has been investigated. The investigations were carried out by Light Optical Microscopy (LOM), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM) and Energy Dispersive Spectroscopy (EDS). Besides, equilibrium and Scheil calculations were carried out using the thermodynamic software MatCalc to analyse the stable phases and the solidification process, respectively. Precipitation calculations during solution annealing and subsequent ageing at 650 and 750°C were performed to predict the phase fraction and precipitates radius up to 10.000h ageing time. SEM and TEM investigations of aged specimens revealed the presence of six different precipitates: M23C 6, Cr2N, sigma, Z-phase, eta-phase (Cr3Ni 2Si(C,N)) and Nb(C,N). These precipitates were predicted and confirmed by MatCalc simulations. The calculated phase fraction and mean radius show good agreement with experimental data. Finally, simulations of different Cr-, C- and N-content in Tp310HCbN were performed.

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M3 - Paper

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T2 - 7th International Conference on Advances in Materials Technology for Fossil Power Plants

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ER -

Modelling and optimizing precipitation in creep resistant austenitic steel 25Cr-20Ni-Nb-N

Abstract

Conference

ASJC Scopus subject areas

UN SDGs

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