Influence of phase angle on lifetime, cyclic deformation and damage behavior of Mar-M247 LC under thermo-mechanical fatigue

Guth, Stefan; Doll, Simon; Lang, Karl‐Heinz

doi:10.1016/j.msea.2015.06.055

Cited by 30 publications

(19 citation statements)

References 13 publications

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“…Accordingly, the lower induced stress results in a compressive mean stress in the IP-TMF and a tensile mean stress in the OP-TMF during the high temperature half cycles. 29) As for IP-TMF tests, the tensile peak stress is much lower than the compressive peak stress, leading to a negative mean stress. The tensile creep damage occurred during the high temperature half cycles because of that the maximum tensile stress does not correspond to the maximum tensile strain.…”

Section: )mentioning

confidence: 98%

“…For this reason, compressive mean stress and tensile mean stress are obtained in IP-TMF and OP-TMF tests, respectively. 29) Mechanical strain amplitude as a function of cycles to failure for isothermal fatigue, IP and OP thermomechanical fatigue tests is shown in Fig. 2.…”

Section: Study Of Fatigue Lifementioning

confidence: 99%

“…The low temperature gives rise to continuously increasing grain boundary damage during tensile half cycles eventually leading to cracking. 29) Furthermore, the grain boundaries weakened by preferential oxidation also plays a role in intergranular crack propagation. Crack propagation along the damaged grain boundaries is facilitated and the crack growth rate is increased.…”

Section: Fatigue Damage Mechanismmentioning

confidence: 99%

“…Crack propagation along the damaged grain boundaries is facilitated and the crack growth rate is increased. 24,29) The intergranular fracture surfaces occur on the fatigue fracture morphologies, which show that the alloy produces intergranular brittle fracture due to grain boundaries weakened. The reasons of grain boundaries weakened are as follows: 66) (1) The accumulation of impurity elements and precipitates on grain boundary; (2) The corrosion of environment; (3) High temperature.…”

Section: Fatigue Damage Mechanismmentioning

confidence: 99%

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Review on Thermo-Mechanical Fatigue Behavior of Nickel-Base Superalloys

et al. 2015

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Nickel-base superalloys have become the key materials of hot-end components in the aeroengines over the past several decades. Nickelbase superalloys are easy to produce thermo-mechanical fatigue (TMF) behavior when withstanding the combined effects of high temperature, creep, oxidation, mechanical stress and thermal stress. The occurrence of TMF seriously affects the normal service for hot-end components. Thus, the investigation about TMF behavior is of great significance. The TMF test can be divided into in-phase (IP) tests and out-of-phase (OP) tests. The fatigue life was described and compared for IP-TMF and OP-TMF. The reasons for various lives were analyzed. The classical life prediction models were evaluated. Cyclic stress response behaviors and hysteresis loops were analyzed. Cyclic deformation mechanism was revealed in depth. Fatigue fractographs of crack initiation and propagation were characterized on the fracture surfaces of fracture specimens. Crack initiation mechanism and fatigue damage mechanism were revealed in depth for TMF.

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Section: )mentioning

confidence: 98%

Section: Study Of Fatigue Lifementioning

confidence: 99%

Section: Fatigue Damage Mechanismmentioning

confidence: 99%

Section: Fatigue Damage Mechanismmentioning

confidence: 99%

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Review on Thermo-Mechanical Fatigue Behavior of Nickel-Base Superalloys

et al. 2015

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“…Many investigations [1][2][3][4][5][6][7][8][9][10][11][12] have assessed the fatigue damage behavior of material under uniaxial TMF loading. The results show that the thermal phase angle (between the axial mechanical strain waveform and the temperature waveform) has an important influence on fatigue life.…”

Section: Introductionmentioning

confidence: 99%

Thermo-mechanical fatigue damage behavior for Ni-based superalloy under multiaxial loading

Shang

2018

MATEC Web Conf.

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Abstract. The fatigue damage behavior was experimentally investigated in different axial-torsional thermo-mechanical loading conditions for Ni-based superalloy GH4169. The strain controlled tests were carried out with the same von Mises equivalent mechanical strain amplitude of 0.8% in the temperature range from 360°C to 650°C. The results show that the fatigue life is drastically reduced when the axial mechanical strain and the temperature are in-phase, which can be due to that the creep damage is induced by the tensile stress at high temperature. Moreover, the fatigue life is further decreased when the axial mechanical strain and the shear strain are out-of-phase, which can be attributed to that the non-proportional hardening can increase the creep and the oxidation damages. Furthermore, the tensile stress is crucial to the nucleation of creep cavities at high temperature compared with the shear stress. The tensile and shear stresses all can increase the creep damage under fatigue loading at high temperature. In addition, the oxidation damage can be induced during cyclic loading at high temperature, and it can be increased by the tensile mean stress caused in non-isothermal loading.

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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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Influence of phase angle on lifetime, cyclic deformation and damage behavior of Mar-M247 LC under thermo-mechanical fatigue

Cited by 30 publications

References 13 publications

Review on Thermo-Mechanical Fatigue Behavior of Nickel-Base Superalloys

Review on Thermo-Mechanical Fatigue Behavior of Nickel-Base Superalloys

Thermo-mechanical fatigue damage behavior for Ni-based superalloy under multiaxial loading

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

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