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A study of the LCF characteristics of the Ni-based superalloy IN738LC

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Abstract

In this study, low cycle fatigue (LCF) tests of IN738LC were conducted under high-temperature conditions. The tests were performed with various mechanical strain amplitudes and the relationship between strain amplitude and fatigue life was obtained. In addition, an equation for LCF life prediction was derived from the test results. After obtaining a strain-life diagram from the LCF test results, additional LCF tests were conducted according to the extent of damage. The LCF tests were taken at various degrees of damage in order to observe the change in mechanical properties the severity of damage. For this purpose, indentation tests were conducted and the relationship between hardness and damage was obtained. To nondestructively assess the low cycle fatigued IN738LC, the subharmonic nonlinearity parameter was first introduced because of the high attenuation properties of IN738LC. Until now, the subharmonic technique has been applied only to crack evaluation problems. This technique is presented as an effective tool for assessing low cycle fatigued IN738LC in this paper.

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Abbreviations

LCF:

low cycle fatigue

TMF:

thermo mechanical fatigue

TGMF:

thermo gradient mechanical fatigue

D:

damage

H:

hardness

Δε t :

total strain range

Δε e :

elastic strain range

Δε p :

plastic strain range

N f :

cycles to failure

2N f :

reversals to failure

b:

fatigue strength exponent

c:

fatigue ductility exponent

σ′ f :

fatigue strength coefficient

ε′ f :

fatigue ductility coefficient

E :

modulus of elasticity

V1:

measured voltage of fundamental amplitude

V2:

measured voltage of second harmonic amplitude

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Authors and Affiliations

  1. Graduate School of Mechanical Engineering, Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon, 440-746, South Korea

    Dongkeun Lee & To Kang

  2. Department of Mechanical Engineering, Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon, 440-746, South Korea

    Jae-Mean Koo, Chang-Sung Seok & Sung-Jin Song

  3. Nuclear Convergence Technology Development Division, Korea Atomic Energy Research Institute (KAERI), 111, Daedeok-daero 989 Beon-gil, Yuseong-gu, Daejeon, 306-353, South Korea

    To Kang

Authors
  1. Dongkeun Lee
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  2. To Kang
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  3. Jae-Mean Koo
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  4. Chang-Sung Seok
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  5. Sung-Jin Song
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Correspondence to Chang-Sung Seok.

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Lee, D., Kang, T., Koo, JM. et al. A study of the LCF characteristics of the Ni-based superalloy IN738LC. Int. J. Precis. Eng. Manuf. 16, 775–780 (2015). https://doi.org/10.1007/s12541-015-0102-5

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  • DOI: https://doi.org/10.1007/s12541-015-0102-5

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