Low‐cycle fatigue of IN 718: Effect of waveform

Barat, Kaustav; Sivaprasad, S.; Kar, Sujoy Kumar; Tarafder, S.

doi:10.1111/ffe.13127

Cited by 9 publications

(7 citation statements)

References 33 publications

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“…Shearing and dissolution of γ 00 precipitates have been reported for isothermal fatigue tests on conventional Inconel 718 at temperature around 650 °C. [19,28] Further, long periods at elevated temperatures allow dislocations to rearrange and possibly annihilate, which is reflected in the generally lower dislocation densities after SF and DT cycling. To a lesser extent, γ 0 coarsening and γ 00 dissolution occurs also for long-running ER tests, when the accumulated time at elevated temperatures is sufficient (see Figure 7c).…”

Section: Microstructural Evolution and Cyclic Deformationmentioning

confidence: 99%

“…When tensile dwell times (DTs) are introduced in LCF or TMF cycles, creep-fatigue interaction increases and the resulting lifetimes are typically reduced. [18][19][20][21] A study by Ngala and Maier [16] on isothermal creep-fatigue interaction on the ODS Ni-base superalloy P1000 showed that so-called slow-fast cycles where the loading rate in the tensile-going part of the cycle is lower than in the compression-going part resulted in even lower lifetimes than cycles with equal ramps (ERs) and additional tensile dwells. Similar results were found in isothermal fatigue tests on Ni-base superalloy MAR-M247 at 750 °C.…”

Section: Introductionmentioning

confidence: 99%

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Creep–Fatigue Interaction of Inconel 718 Manufactured by Electron Beam Melting

et al. 2023

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Electron beam melting of Ni‐base superalloy Inconel 718 allows producing a columnar‐grained microstructure with a pronounced texture, which offers exceptional resistance against high‐temperature loading with severe creep–fatigue interaction arising in components of aircraft jet engines. This study considers the deformation, damage, and lifetime behavior of electron‐beam‐melted Inconel 718 under in‐phase thermomechanical fatigue loading with varying amounts of creep–fatigue interaction. Strain‐controlled thermomechanical fatigue tests with equal‐ramp cycles, slow–fast cycles, and dwell time cycles are conducted in the temperature range from 300 to 650 °C. Results show that both dwell time and slow–fast cycles promote intergranular cracking, gradual tensile stress relaxation, as well as precipitate dissolution and coarsening giving rise to cyclic softening. The interplay of these mechanisms leads to increased lifetimes in both dwell time and slow–fast tests compared to equal ramp tests at higher strain amplitudes. Conversely, at lower mechanical strain amplitudes, the opposite is observed. A comparison with results of conventional Inconel 718 indicates that the electron‐beam‐melted material exhibits superior resistance against strain‐controlled loading at elevated temperatures such as thermomechanical fatigue.

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Section: Microstructural Evolution and Cyclic Deformationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Creep–Fatigue Interaction of Inconel 718 Manufactured by Electron Beam Melting

et al. 2023

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“…Numerous scholars have conducted research on the fatigue performance of components under different fatigue loading waveform conditions. Barat et al [1] investigated the influence of fatigue loading waveforms on the low-cycle fatigue performance of IN718 alloy specimens, and observed a decrease in cyclic softening with increasing fatigue life.…”

Section: Introductionmentioning

confidence: 99%

Influence of Loading Waveform on the Fatigue Life of 34CrNi3MoVA Steel

Guan,

Tang,

Chen

2024

Metals

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Mechanical components often experience fatigue loading from various waveform conditions during their operational lifespan. However, the underlying mechanisms through which variations in loading waveform affect the fatigue life of components remain unclear. Thus, this study conducted tension–compression fatigue experiments on 34CrNi3MoVA steel specimens under the same stress amplitude with different waveforms (cosine, triangular, sawtooth, and reverse sawtooth) to investigate the effects of loading waveform variations on the cyclic strain hardening behaviors, the fatigue fracture failure, and the fatigue life. The results indicated that specimens under different waveforms all exhibited cyclic strain hardening. The fatigue cyclic hardening level progressively increased in the order of cosine, triangular, and sawtooth waveforms, resulting in a continuous increase in cyclic saturation strain amplitude. The analysis of fatigue fractures demonstrated a consistent increase in both the initiation and propagation zone areas in the order of cosine, triangular, and sawtooth waveforms, and the boundary between the propagation and final fracture zones gradually shifted from a straight to a curved shape. The influence mechanisms of cyclic loading waveforms on the fatigue life of specimens were analyzed based on the energy dissipation, leading to the development of a universal fatigue life prediction model applicable to different waveform conditions, the model was then verified with the reverse sawtooth wave specimens and resulted in a prediction error less than 15%. The study is expected to serve as a significant guide for predicting and evaluating the fatigue life of mechanical components under various fatigue loading conditions.

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“…The mean stress is developed in the stress relaxation stage during hold durations, and the effect of mean stress on creep fatigue cannot be ignored 3 . Moreover, the loading waveform 4 and strain amplitude 5 can also affect the high temperature fatigue behaviour. All these factors mentioned above make it difficult to develop a unified and efficient life prediction method for both HTLCF and creep‐fatigue.…”

Section: Introductionmentioning

confidence: 99%

An efficient fatigue and creep‐fatigue life prediction method by using the hysteresis energy density rate concept

Wang

2020

Fatigue Fract Eng Mat Struct

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Fatigue damage, time-dependent creep damage and their interaction are considered as the main failure mechanisms for many high temperature structural components. A generalized methodology for predicting both the high temperature low cycle fatigue (HTLCF) and creep-fatigue lives by using the hysteresis energy density rate (HEDR) and fatigue damage stress concepts was proposed.Experimental data for HTLCF and creep-fatigue in Alloy 617, Haynes 230 and

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Low‐cycle fatigue of IN 718: Effect of waveform

Cited by 9 publications

References 33 publications

Creep–Fatigue Interaction of Inconel 718 Manufactured by Electron Beam Melting

Creep–Fatigue Interaction of Inconel 718 Manufactured by Electron Beam Melting

Influence of Loading Waveform on the Fatigue Life of 34CrNi3MoVA Steel

An efficient fatigue and creep‐fatigue life prediction method by using the hysteresis energy density rate concept

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