Degradation of single-crystal gas turbine blades

Juhani Rantala, Jorma Salonen, Sanni Yli-Olli, Stefan Holmström, Petra Jauhiainen

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

Abstract

The work presented in this paper aimed to evaluate and classify the microstructural degradation of diffusion coated single-crystal gas turbine blade, so that the characterised features of degradation could be used for assessing the effective in-service material temperatures at the corresponding blade locations. Two potentially useful indicative measures were evaluated for this purpose: a) gamma prime coarsening and degradation in the substrate microstructure to indicate the condition and temperature in the blade interior and b) combined thickness of the intermediate diffusion zone (IDZ) and topologically close-packed (TCP) precipitate layers to indicate the condition and temperature at the blade coating. Both applied measures appear to provide meaningful indications of the service temperature, although not with the same level of uncertainty. The thickness of IDZ+TPC layers can indicate the effective temperatures to a relatively good accuracy as long as the IDZ and TPC layers remain sufficiently intact for the assessment. For verification and demonstration purposes, a case example is shown of an ex-service turbine blade.
Original languageEnglish
Title of host publicationBaltica IX. International Conference on Life Management and Maintenance for Power Plants
EditorsPertti Auerkari, Juha Veivo
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Pages233-250
ISBN (Print)978-951-38-8025-5, 978-951-38-8026-2
Publication statusPublished - 2013
MoE publication typeA4 Article in a conference publication
EventBALTICA IX - International Conference on Life Management and Maintenance for Power Plants - Helsinki-Stockholm, Finland
Duration: 11 Jun 201313 Jun 2013

Publication series

NameVTT Technology
PublisherVTT
Number106
ISSN (Print)2242-1211
ISSN (Electronic)2242-122X

Conference

ConferenceBALTICA IX - International Conference on Life Management and Maintenance for Power Plants
CountryFinland
CityHelsinki-Stockholm
Period11/06/1313/06/13

Fingerprint

Turbomachine blades
Gas turbines
Single crystals
Degradation
Temperature
Coarsening
Precipitates
Turbines
Demonstrations
Coatings
Microstructure
Substrates

Cite this

Rantala, J., Salonen, J., Yli-Olli, S., Holmström, S., & Jauhiainen, P. (2013). Degradation of single-crystal gas turbine blades. In P. Auerkari, & J. Veivo (Eds.), Baltica IX. International Conference on Life Management and Maintenance for Power Plants (pp. 233-250). Espoo: VTT Technical Research Centre of Finland. VTT Technology, No. 106
Rantala, Juhani ; Salonen, Jorma ; Yli-Olli, Sanni ; Holmström, Stefan ; Jauhiainen, Petra. / Degradation of single-crystal gas turbine blades. Baltica IX. International Conference on Life Management and Maintenance for Power Plants. editor / Pertti Auerkari ; Juha Veivo. Espoo : VTT Technical Research Centre of Finland, 2013. pp. 233-250 (VTT Technology; No. 106).
@inproceedings{2059563914e74f289c908dbba8391bea,
title = "Degradation of single-crystal gas turbine blades",
abstract = "The work presented in this paper aimed to evaluate and classify the microstructural degradation of diffusion coated single-crystal gas turbine blade, so that the characterised features of degradation could be used for assessing the effective in-service material temperatures at the corresponding blade locations. Two potentially useful indicative measures were evaluated for this purpose: a) gamma prime coarsening and degradation in the substrate microstructure to indicate the condition and temperature in the blade interior and b) combined thickness of the intermediate diffusion zone (IDZ) and topologically close-packed (TCP) precipitate layers to indicate the condition and temperature at the blade coating. Both applied measures appear to provide meaningful indications of the service temperature, although not with the same level of uncertainty. The thickness of IDZ+TPC layers can indicate the effective temperatures to a relatively good accuracy as long as the IDZ and TPC layers remain sufficiently intact for the assessment. For verification and demonstration purposes, a case example is shown of an ex-service turbine blade.",
author = "Juhani Rantala and Jorma Salonen and Sanni Yli-Olli and Stefan Holmstr{\"o}m and Petra Jauhiainen",
year = "2013",
language = "English",
isbn = "978-951-38-8025-5",
series = "VTT Technology",
publisher = "VTT Technical Research Centre of Finland",
number = "106",
pages = "233--250",
editor = "Pertti Auerkari and Juha Veivo",
booktitle = "Baltica IX. International Conference on Life Management and Maintenance for Power Plants",
address = "Finland",

}

Rantala, J, Salonen, J, Yli-Olli, S, Holmström, S & Jauhiainen, P 2013, Degradation of single-crystal gas turbine blades. in P Auerkari & J Veivo (eds), Baltica IX. International Conference on Life Management and Maintenance for Power Plants. VTT Technical Research Centre of Finland, Espoo, VTT Technology, no. 106, pp. 233-250, BALTICA IX - International Conference on Life Management and Maintenance for Power Plants, Helsinki-Stockholm, Finland, 11/06/13.

Degradation of single-crystal gas turbine blades. / Rantala, Juhani; Salonen, Jorma; Yli-Olli, Sanni; Holmström, Stefan; Jauhiainen, Petra.

Baltica IX. International Conference on Life Management and Maintenance for Power Plants. ed. / Pertti Auerkari; Juha Veivo. Espoo : VTT Technical Research Centre of Finland, 2013. p. 233-250 (VTT Technology; No. 106).

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

TY - GEN

T1 - Degradation of single-crystal gas turbine blades

AU - Rantala, Juhani

AU - Salonen, Jorma

AU - Yli-Olli, Sanni

AU - Holmström, Stefan

AU - Jauhiainen, Petra

PY - 2013

Y1 - 2013

N2 - The work presented in this paper aimed to evaluate and classify the microstructural degradation of diffusion coated single-crystal gas turbine blade, so that the characterised features of degradation could be used for assessing the effective in-service material temperatures at the corresponding blade locations. Two potentially useful indicative measures were evaluated for this purpose: a) gamma prime coarsening and degradation in the substrate microstructure to indicate the condition and temperature in the blade interior and b) combined thickness of the intermediate diffusion zone (IDZ) and topologically close-packed (TCP) precipitate layers to indicate the condition and temperature at the blade coating. Both applied measures appear to provide meaningful indications of the service temperature, although not with the same level of uncertainty. The thickness of IDZ+TPC layers can indicate the effective temperatures to a relatively good accuracy as long as the IDZ and TPC layers remain sufficiently intact for the assessment. For verification and demonstration purposes, a case example is shown of an ex-service turbine blade.

AB - The work presented in this paper aimed to evaluate and classify the microstructural degradation of diffusion coated single-crystal gas turbine blade, so that the characterised features of degradation could be used for assessing the effective in-service material temperatures at the corresponding blade locations. Two potentially useful indicative measures were evaluated for this purpose: a) gamma prime coarsening and degradation in the substrate microstructure to indicate the condition and temperature in the blade interior and b) combined thickness of the intermediate diffusion zone (IDZ) and topologically close-packed (TCP) precipitate layers to indicate the condition and temperature at the blade coating. Both applied measures appear to provide meaningful indications of the service temperature, although not with the same level of uncertainty. The thickness of IDZ+TPC layers can indicate the effective temperatures to a relatively good accuracy as long as the IDZ and TPC layers remain sufficiently intact for the assessment. For verification and demonstration purposes, a case example is shown of an ex-service turbine blade.

M3 - Conference article in proceedings

SN - 978-951-38-8025-5

SN - 978-951-38-8026-2

T3 - VTT Technology

SP - 233

EP - 250

BT - Baltica IX. International Conference on Life Management and Maintenance for Power Plants

A2 - Auerkari, Pertti

A2 - Veivo, Juha

PB - VTT Technical Research Centre of Finland

CY - Espoo

ER -

Rantala J, Salonen J, Yli-Olli S, Holmström S, Jauhiainen P. Degradation of single-crystal gas turbine blades. In Auerkari P, Veivo J, editors, Baltica IX. International Conference on Life Management and Maintenance for Power Plants. Espoo: VTT Technical Research Centre of Finland. 2013. p. 233-250. (VTT Technology; No. 106).