In-service and simulated thermal transformation of steels for high temperature applications

P. Auerkari, S. Yli-Olli, S. Tuurna

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Abstract

To characterize the actual local long term operating conditions, possible deviations in them and the material condition, it is essential to be able to understand and evaluate the time and temperature dependent change of high temperature structural materials of power and process plants. In this paper the thermal degradation of selected steels is discussed with comparison of materials extracted from plant after long term service and similar materials thermally exposed to simulating heat treatment (controlled annealing). In general, such comparisons can be used to assess for example the effective in-service temperatures. However, there are also caveats to consider, such as variation of the initial composition and heat treatments, impact of stress-activated component of diffusion, and the material-dependent differences in the kinetics of different aspects of microstructural degradation. Examples are given to illustrate the observed influence of these factors of uncertainty.
Original languageEnglish
Title of host publicationHeat treatment and surface engineering: from tradition to innovation
Subtitle of host publicationEuropean Conference on Heat Treatment 2015 & 22nd IFHTSE congress
PublisherAssociazione Italiana di Metallurgia AIM
ISBN (Electronic)978-889899003-0
Publication statusPublished - 2015
MoE publication typeA4 Article in a conference publication
EventEuropean Conference on Heat Treatment 2015 & 22nd IFHTSW Congress Heat Treatment and Surface Engineering - Venice, Italy
Duration: 20 May 201522 May 2015

Conference

ConferenceEuropean Conference on Heat Treatment 2015 & 22nd IFHTSW Congress Heat Treatment and Surface Engineering
CountryItaly
CityVenice
Period20/05/1522/05/15

Fingerprint

High temperature applications
Steel
Heat treatment
Temperature
Pyrolysis
Annealing
Degradation
Kinetics
Hot Temperature
Chemical analysis

Keywords

  • in-service
  • microstructure
  • prediction
  • steel
  • temperature
  • transformation

Cite this

Auerkari, P., Yli-Olli, S., & Tuurna, S. (2015). In-service and simulated thermal transformation of steels for high temperature applications. In Heat treatment and surface engineering: from tradition to innovation: European Conference on Heat Treatment 2015 & 22nd IFHTSE congress Associazione Italiana di Metallurgia AIM.
Auerkari, P. ; Yli-Olli, S. ; Tuurna, S. / In-service and simulated thermal transformation of steels for high temperature applications. Heat treatment and surface engineering: from tradition to innovation: European Conference on Heat Treatment 2015 & 22nd IFHTSE congress. Associazione Italiana di Metallurgia AIM, 2015.
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Auerkari, P, Yli-Olli, S & Tuurna, S 2015, In-service and simulated thermal transformation of steels for high temperature applications. in Heat treatment and surface engineering: from tradition to innovation: European Conference on Heat Treatment 2015 & 22nd IFHTSE congress. Associazione Italiana di Metallurgia AIM, European Conference on Heat Treatment 2015 & 22nd IFHTSW Congress Heat Treatment and Surface Engineering, Venice, Italy, 20/05/15.

In-service and simulated thermal transformation of steels for high temperature applications. / Auerkari, P.; Yli-Olli, S.; Tuurna, S.

Heat treatment and surface engineering: from tradition to innovation: European Conference on Heat Treatment 2015 & 22nd IFHTSE congress. Associazione Italiana di Metallurgia AIM, 2015.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

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T1 - In-service and simulated thermal transformation of steels for high temperature applications

AU - Auerkari, P.

AU - Yli-Olli, S.

AU - Tuurna, S.

PY - 2015

Y1 - 2015

N2 - To characterize the actual local long term operating conditions, possible deviations in them and the material condition, it is essential to be able to understand and evaluate the time and temperature dependent change of high temperature structural materials of power and process plants. In this paper the thermal degradation of selected steels is discussed with comparison of materials extracted from plant after long term service and similar materials thermally exposed to simulating heat treatment (controlled annealing). In general, such comparisons can be used to assess for example the effective in-service temperatures. However, there are also caveats to consider, such as variation of the initial composition and heat treatments, impact of stress-activated component of diffusion, and the material-dependent differences in the kinetics of different aspects of microstructural degradation. Examples are given to illustrate the observed influence of these factors of uncertainty.

AB - To characterize the actual local long term operating conditions, possible deviations in them and the material condition, it is essential to be able to understand and evaluate the time and temperature dependent change of high temperature structural materials of power and process plants. In this paper the thermal degradation of selected steels is discussed with comparison of materials extracted from plant after long term service and similar materials thermally exposed to simulating heat treatment (controlled annealing). In general, such comparisons can be used to assess for example the effective in-service temperatures. However, there are also caveats to consider, such as variation of the initial composition and heat treatments, impact of stress-activated component of diffusion, and the material-dependent differences in the kinetics of different aspects of microstructural degradation. Examples are given to illustrate the observed influence of these factors of uncertainty.

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KW - microstructure

KW - prediction

KW - steel

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Auerkari P, Yli-Olli S, Tuurna S. In-service and simulated thermal transformation of steels for high temperature applications. In Heat treatment and surface engineering: from tradition to innovation: European Conference on Heat Treatment 2015 & 22nd IFHTSE congress. Associazione Italiana di Metallurgia AIM. 2015