High temperature low cycle fatigue deformation behaviour of forged IN 718 superalloy turbine disc

Prasad, Kartik; Sarkar, Rajdeep; Ghosal, Partha; Kumar, Vikas; Sundararaman, M.

doi:10.1016/j.msea.2012.12.069

Cited by 51 publications

(20 citation statements)

References 30 publications

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“…An interesting work was presented by Prasad et al [3] Lowcycle fatigue deformation behavior of forged turbine disc of IN 718 superalloy of different sections, and thus geometries, was studied under asymmetrical waveforms (slow-fast and fast-slow) at 650 C. The superalloy exhibited dynamic strain aging by showing serration during the lower strain rate plastic region of the hysteresis loop under asymmetrical waveforms. Irrespective of different sections, the superalloy showed a marginally reduction of fatigue life under slow-fast waveform as compared to fast-slow waveform, because of the LCF damage accumulation.…”

Section: Introductionmentioning

confidence: 99%

Advanced Materials for Applications at High Temperature: Fatigue Assessment by Means of Local Strain Energy Density

Gallo

Berto

2015

Adv Eng Mater

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The interest on fatigue assessment of steel and other alloys at high temperature has increased continuously in the last years. However, high cycle fatigue of notched components at high temperature has not been deeply investigated experimentally and theoretically. The present paper investigates the accuracy of Strain Energy Density (SED) averaged over a control volume approach when applied to high-temperature fatigue data from notched components. In the present work, a large bulk of high-temperature fatigue data, taken from the literature and regarding notched components made of different advanced materials, is reanalyzed. In detail: C45 carbon steel at 250°C, Inconel 718 at 500°C, and directionally solidified superalloy DZ125 at 850°C are considered. The main advantage of SED averaged over a control volume is that different geometries can be summarized in a single narrow scatter band. From an industrial viewpoint, the use of a geometry-independent parameter (and fatigue curve) leads to a considerable advantage in terms of time and cost

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Section: Introductionmentioning

confidence: 99%

Advanced Materials for Applications at High Temperature: Fatigue Assessment by Means of Local Strain Energy Density

Gallo

Berto

2015

Adv Eng Mater

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“…The aforementioned studies may consider the reason that aging treatments substantially increase the static strength of the Inconel 718 alloy. The researchers almost always used aged (DA or ST + A) state Inconel 718 alloy with the zigzag curve phenomenon that occurs on the plastic section from the hysteresis loop [29,30] and cyclic softening under high temperature low cycle fatigue; under room temperature low cycle fatigue, the dual-slope Manson-Coffin relationship between the cyclic strain and fatigue life and the softening that occurs immediately following hardening in the initial stage of the cycle are both attributed to γ" phase shearing in the aged state. However, Rae et al [31] and Praveen et al [32] studied the low cycle fatigue characteristics of ST state Inconel 718 alloy at room temperature and found that the ST state was the same as the aged state alloy, as the ST state presented the zigzag curve phenomenon on the plastic section from the hysteresis loop [31] and satisfied the dual-slope Manson-Coffin relationship between the cyclic strain and the cyclic softening and low cycle fatigue life immediately following hardening in the initial stage of the cycle [32].…”

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confidence: 99%

High Cycle Fatigue Performance of Inconel 718 Alloys with Different Strengths at Room Temperature

Liqiong

Liang

et al. 2018

Metals

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In this paper, the high cycle fatigue performance of solid solution state and aged Inconel 718 superalloys was studied at room temperature. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were used to analyze the original structural features and fatigue deformation features of two kinds of alloys. SEM, laser scanning confocal microscopy, and electron backscatter diffraction (EBSD) were used to analyze the secondary fracture features of the fatigue fracture morphology and fatigue fracture profile. The results showed that the aging treatment significantly affected the strength and plasticity of the alloy, which in turn affected the fatigue performance of the alloy. After the aging treatment, the yield strength σ s and the tensile strength σ b of the Inconel 718 alloy increased by 152% and 65.9%, respectively, compared with those of the solid solution state, but the rate of elongation δ and rate of contraction in the cross-section area ϕ decreased by 63.7% and 52.3%, respectively. The fatigue limit of the aged state was lower than that of the solid solution state by 6.3%. The quadratic function relationship between the high cycle fatigue limit σ −1 and the tensile strength σ b of the Inconel 718 superalloy at room temperature was σ −1 = σ b · (0.869−3.67 × 10 −4 · σ b ). An analysis of the fatigue fracture mechanism showed that the fatigue fractures before and after aging were all initiated in the grains oriented relatively unfavorably on the surface of the sample, with a mixture of intergranular and transgranular propagation after the transgranular propagation of several grains. The higher plasticity of the solid solution state Inconel 718 alloy resulted in a large number of slip deformation zones under high cycle fatigue loads, and the plastic deformation was relatively uniform. The lengths of the secondary fractures were as high as 120 µm, which formed the single-source plastic fatigue fracture that promoted an increase in the fatigue limit. After aging treatment, the higher strength of the Inconel 718 alloy made dislocation slip difficult under high cycle fatigue loads, and the plasticity compatible deformation capability was poor. When local dislocations slipped to the intragranular γ" phase, γ' phase, or interfaces with nonmetallic compounds (NMCs), plugging occurred. The degree of stress concentration increased, causing the initiation of fatigue fracture; the secondary fracture was approximately 20 µm. Brittle cleavage due to multiple sources significantly reduced the fatigue limit.

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“…e ever-increasing demands for high-reliability performance and low maintenance cost drive the rising attention to the life prediction approaches. To date, many efforts have quantified the fatigue life with numerical and experimental investigations via deterministic analyses, which assures the prediction security for fatigue life by relatively conservative results [5][6][7]. However, these efforts possess great blindness in fatigue life prediction because the randomness of various impact factors is not considered.…”

Section: Introductionmentioning

confidence: 99%

Reliability‐Based Fatigue Life Prediction for Complex Structure with Time‐Varying Surrogate Modeling

Song

Bai

Fei

et al. 2018

Advances in Materials Science and Engineering

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To improve the computational efficiency and accuracy of reliability-based fatigue life prediction for complex structure, a time-varying particle swarm optimization- (PSO-) based general regression neural network (GRNN) surrogate model (called as TV/PSO-GRNN) is developed. By integrating the proposed space-filling Latin hypercube sampling technique and PSO-GRNN regression function, the mathematical model of TV/PSO-GRNN is studied. The reliability-based fatigue life prediction framework is illustrated in respect of the TV/PSO-GRNN surrogate model. Moreover, the reliability-based fatigue life prediction of an aircraft turbine blisk under multiphysics interaction is performed to validate the TV/PSO-GRNN model. We obtain the distributional characteristics, reliability degree, and sensitivity degree of fatigue failure cycle, which are useful for the turbine blisk design. By comparing the direct simulation (FE/FV model), RSM, GRNN, PSO-GRNN, and TV/PSO-GRNN, we observe that the TV/PSO-GRNN surrogate model is promising to perform the reliability-based fatigue life prediction of the turbine blisk and enhance the computational efficiency while ensuring an acceptable computational accuracy. The efforts of this study offer a useful insight for the reliability-based design optimization of complex structure.

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High temperature low cycle fatigue deformation behaviour of forged IN 718 superalloy turbine disc

Cited by 51 publications

References 30 publications

Advanced Materials for Applications at High Temperature: Fatigue Assessment by Means of Local Strain Energy Density

Advanced Materials for Applications at High Temperature: Fatigue Assessment by Means of Local Strain Energy Density

High Cycle Fatigue Performance of Inconel 718 Alloys with Different Strengths at Room Temperature

Reliability‐Based Fatigue Life Prediction for Complex Structure with Time‐Varying Surrogate Modeling

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