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Thermo mechanical fatigue life prediction of Ni-based superalloy IN738LC

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Abstract

The thermo mechanical fatigue (TMF) test is known to most accurately simulate the operational environment of a gas turbine’s substate. However, because the TMF test equipment and methodology are very complex, these tests are difficult to conduct. Some researchers have recently attempted to examine methods for evaluating the TMF lifetime of superalloy materials used in turbine blades by using the results of a low cycle fatigue (LCF) test in which the test equipment and method are relatively simple. However, this research was mainly conducted on specific materials such as M963 and GTD-111, and only a few studies have been conducted on IN738LC, which is a widely used material for commercial gas turbine blades. Therefore, this study examined a method for evaluating the TMF lifetime of an IN738LC material by using LCF rtest results. For that purpose, LCF and TMF tests were conducted, and the TMF lifetime was predicted with the LCF test results, using the Ostergren and Zamrik models. Lifetime prediction of IN738LC using the LCF test results from this study was compared with previous lifetime prediction results on other superalloys such as M963 and GTD-111 to review the cause of the difference in lifetime prediction results.

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Abbreviations

LCF:

low cycle fatigue

TMF:

thermo mechanical fatigue

IP:

in-phase

OP:

out-of-phase

Δε p :

plastic strain range

ε ten :

tensile strain range

ε f :

strain to failure

σ max :

maximum stress

σ u :

ultimate strength

N f :

cycles to failure

C, β :

material constants of Ostergren model

A, B :

material constants of Zamrik model

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Authors and Affiliations

  1. Convergence Agricultural Machinery R&D Group, Korea Institute of Industrial Technology, 119, Jipyeongseonsandan 3-gil, Baeksan-myeon, Gimje-si, Jeollabuk-do, 54325, South Korea

    Dongkeun Lee & Young-Joo Kim

  2. Graduate School of Mechanical Engineering, Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon-si, Gyeonggi-do, 16419, South Korea

    Jeong-Min Lee

  3. Department of Mechanical Engineering, Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon-si, Gyeonggi-do, 16419, South Korea

    Jae-Mean Koo & Chang-Sung Seok

  4. Railroad Type Approval Team, Korea Railroad Research Institute, 176, Cheoldobangmulgwan-ro, Uiwang-si, Gyeonggi-do, 16105, South Korea

    Yongseok Kim

Authors
  1. Dongkeun Lee
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  2. Jeong-Min Lee
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  3. Yongseok Kim
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  4. Jae-Mean Koo
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  5. Chang-Sung Seok
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  6. Young-Joo Kim
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Correspondence to Chang-Sung Seok.

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Lee, D., Lee, JM., Kim, Y. et al. Thermo mechanical fatigue life prediction of Ni-based superalloy IN738LC. Int. J. Precis. Eng. Manuf. 18, 561–566 (2017). https://doi.org/10.1007/s12541-017-0067-7

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  • DOI: https://doi.org/10.1007/s12541-017-0067-7

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