A study of creep-fatigue interaction in the nickel-base superalloy 263

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

Abstract

Ni-based superalloys, such as alloy 263, have excellent creep strength at high temperatures due to precipitation of gamma prime. Therefore they are candidate materials for thick section components as well as tubing in advanced ultra-supercritical (A-USC) power plants where temperatures exceed 700 °C. Because of the lower thermal expansion coefficient the Ni-based superalloys are less prone to thermal fatigue damage than the austenitic stainless steels. A series of creep-fatigue (CF) and low cycle fatigue (LCF) tests have been performed in order to study the effect of the test temperature, hold time, total strain range and a pre-creep exposure of 178MPa / 3000h / 750ºC on the creep-fatigue life of alloy 263. All LCF and CF tests were per-formed using the high precision pneumatic loading system (HIPS) at temperatures in the range of 700-750ºC, the total strain range between 0.5-1.0% and with hold periods up to 10h in both tension and compression. In this paper stress relaxation time plots, ?-N plots and ??-N plots are presented for alloy 263. The creep-fatigue test results are analysed using time fraction ap-proach utilized in the nuclear material assessment and design codes, such as RCC-MRx and ASME III NH. The results are compared against public domain data and fitted to the recently developed ? -model. The ? -model utilizes the creep rupture strength and tensile strength for predicting CF life with a minimum amount of fitting parameters. It is shown that the number of cycles to failure for CF data for alloy 263 can be accurately predicted by the ? -model. Furthermore, the practicality in using the time fraction approach for presenting the combined CF damage is discussed and recommendations for alternative approaches are made
Original languageEnglish
Title of host publicationProceeding CD
Subtitle of host publication10th Liege Conference on Materials for Advanced Power Engineering 2014
Pages678-687
Publication statusPublished - 2014
MoE publication typeA4 Article in a conference publication
Event10th Liege Conference on Materials for Advanced Power Engineering - Liege, Belgium
Duration: 14 Sep 201417 Sep 2014
Conference number: 10

Conference

Conference10th Liege Conference on Materials for Advanced Power Engineering
CountryBelgium
CityLiege
Period14/09/1417/09/14

Fingerprint

Superalloys
Creep
Nickel
Fatigue of materials
Fatigue damage
Temperature
Thermal fatigue
Stress relaxation
Tubing
Austenitic stainless steel
Pneumatics
Relaxation time
Thermal expansion
Power plants
Tensile strength

Keywords

  • superalloys
  • nickel
  • alloy 263
  • creep
  • fatigue
  • stress
  • modelling

Cite this

Pohja, R., Holmström, S., Nurmela, A., & Moilanen, P. (2014). A study of creep-fatigue interaction in the nickel-base superalloy 263. In Proceeding CD: 10th Liege Conference on Materials for Advanced Power Engineering 2014 (pp. 678-687)
Pohja, Rami ; Holmström, Stefan ; Nurmela, Asta ; Moilanen, Pekka. / A study of creep-fatigue interaction in the nickel-base superalloy 263. Proceeding CD: 10th Liege Conference on Materials for Advanced Power Engineering 2014. 2014. pp. 678-687
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title = "A study of creep-fatigue interaction in the nickel-base superalloy 263",
abstract = "Ni-based superalloys, such as alloy 263, have excellent creep strength at high temperatures due to precipitation of gamma prime. Therefore they are candidate materials for thick section components as well as tubing in advanced ultra-supercritical (A-USC) power plants where temperatures exceed 700 °C. Because of the lower thermal expansion coefficient the Ni-based superalloys are less prone to thermal fatigue damage than the austenitic stainless steels. A series of creep-fatigue (CF) and low cycle fatigue (LCF) tests have been performed in order to study the effect of the test temperature, hold time, total strain range and a pre-creep exposure of 178MPa / 3000h / 750ºC on the creep-fatigue life of alloy 263. All LCF and CF tests were per-formed using the high precision pneumatic loading system (HIPS) at temperatures in the range of 700-750ºC, the total strain range between 0.5-1.0{\%} and with hold periods up to 10h in both tension and compression. In this paper stress relaxation time plots, ?-N plots and ??-N plots are presented for alloy 263. The creep-fatigue test results are analysed using time fraction ap-proach utilized in the nuclear material assessment and design codes, such as RCC-MRx and ASME III NH. The results are compared against public domain data and fitted to the recently developed ? -model. The ? -model utilizes the creep rupture strength and tensile strength for predicting CF life with a minimum amount of fitting parameters. It is shown that the number of cycles to failure for CF data for alloy 263 can be accurately predicted by the ? -model. Furthermore, the practicality in using the time fraction approach for presenting the combined CF damage is discussed and recommendations for alternative approaches are made",
keywords = "superalloys, nickel, alloy 263, creep, fatigue, stress, modelling",
author = "Rami Pohja and Stefan Holmstr{\"o}m and Asta Nurmela and Pekka Moilanen",
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booktitle = "Proceeding CD",

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Pohja, R, Holmström, S, Nurmela, A & Moilanen, P 2014, A study of creep-fatigue interaction in the nickel-base superalloy 263. in Proceeding CD: 10th Liege Conference on Materials for Advanced Power Engineering 2014. pp. 678-687, 10th Liege Conference on Materials for Advanced Power Engineering, Liege, Belgium, 14/09/14.

A study of creep-fatigue interaction in the nickel-base superalloy 263. / Pohja, Rami; Holmström, Stefan; Nurmela, Asta; Moilanen, Pekka.

Proceeding CD: 10th Liege Conference on Materials for Advanced Power Engineering 2014. 2014. p. 678-687.

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

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AU - Pohja, Rami

AU - Holmström, Stefan

AU - Nurmela, Asta

AU - Moilanen, Pekka

N1 - Project code: 37393

PY - 2014

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N2 - Ni-based superalloys, such as alloy 263, have excellent creep strength at high temperatures due to precipitation of gamma prime. Therefore they are candidate materials for thick section components as well as tubing in advanced ultra-supercritical (A-USC) power plants where temperatures exceed 700 °C. Because of the lower thermal expansion coefficient the Ni-based superalloys are less prone to thermal fatigue damage than the austenitic stainless steels. A series of creep-fatigue (CF) and low cycle fatigue (LCF) tests have been performed in order to study the effect of the test temperature, hold time, total strain range and a pre-creep exposure of 178MPa / 3000h / 750ºC on the creep-fatigue life of alloy 263. All LCF and CF tests were per-formed using the high precision pneumatic loading system (HIPS) at temperatures in the range of 700-750ºC, the total strain range between 0.5-1.0% and with hold periods up to 10h in both tension and compression. In this paper stress relaxation time plots, ?-N plots and ??-N plots are presented for alloy 263. The creep-fatigue test results are analysed using time fraction ap-proach utilized in the nuclear material assessment and design codes, such as RCC-MRx and ASME III NH. The results are compared against public domain data and fitted to the recently developed ? -model. The ? -model utilizes the creep rupture strength and tensile strength for predicting CF life with a minimum amount of fitting parameters. It is shown that the number of cycles to failure for CF data for alloy 263 can be accurately predicted by the ? -model. Furthermore, the practicality in using the time fraction approach for presenting the combined CF damage is discussed and recommendations for alternative approaches are made

AB - Ni-based superalloys, such as alloy 263, have excellent creep strength at high temperatures due to precipitation of gamma prime. Therefore they are candidate materials for thick section components as well as tubing in advanced ultra-supercritical (A-USC) power plants where temperatures exceed 700 °C. Because of the lower thermal expansion coefficient the Ni-based superalloys are less prone to thermal fatigue damage than the austenitic stainless steels. A series of creep-fatigue (CF) and low cycle fatigue (LCF) tests have been performed in order to study the effect of the test temperature, hold time, total strain range and a pre-creep exposure of 178MPa / 3000h / 750ºC on the creep-fatigue life of alloy 263. All LCF and CF tests were per-formed using the high precision pneumatic loading system (HIPS) at temperatures in the range of 700-750ºC, the total strain range between 0.5-1.0% and with hold periods up to 10h in both tension and compression. In this paper stress relaxation time plots, ?-N plots and ??-N plots are presented for alloy 263. The creep-fatigue test results are analysed using time fraction ap-proach utilized in the nuclear material assessment and design codes, such as RCC-MRx and ASME III NH. The results are compared against public domain data and fitted to the recently developed ? -model. The ? -model utilizes the creep rupture strength and tensile strength for predicting CF life with a minimum amount of fitting parameters. It is shown that the number of cycles to failure for CF data for alloy 263 can be accurately predicted by the ? -model. Furthermore, the practicality in using the time fraction approach for presenting the combined CF damage is discussed and recommendations for alternative approaches are made

KW - superalloys

KW - nickel

KW - alloy 263

KW - creep

KW - fatigue

KW - stress

KW - modelling

M3 - Conference article in proceedings

SN - 978-3-95806-000-5

SP - 678

EP - 687

BT - Proceeding CD

ER -

Pohja R, Holmström S, Nurmela A, Moilanen P. A study of creep-fatigue interaction in the nickel-base superalloy 263. In Proceeding CD: 10th Liege Conference on Materials for Advanced Power Engineering 2014. 2014. p. 678-687