Simulated extreme value fatigue sensitivity to inclusions and pores in martensitic gear steels

Prasannavenkatesan, Rajesh; Przybyla, Craig; Salajegheh, Nima; McDowell, David L.

doi:10.1016/j.engfracmech.2011.01.027

Cited by 44 publications

(39 citation statements)

References 51 publications

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“…Prasannavenkatesan and co-workers [1,2] considered the effect of shot peening-induced surface residual stresses, pores, and hard and soft primary inclusions in martensitic gear steel in the context of 3D polycrystal plasticity and nonlocal FIPs. Effects of inclusion fracture/debonding and initial subsurface residual stress following carburisation and tempering were coupled via computation as a function of surface proximity to estimate the likelihood of crack formation.…”

Section: Probabilistic Approaches To Account For Coupled Notchmicrostmentioning

confidence: 99%

“…The BiF cycle is useful for isolating damage interactions and may be done for either OP or IP cycles. 1 In this part of the article ''loading'' is used in a general sense and includes all modes of loading. Whether strains, loads or stresses are considered, it depends upon the context.…”

Section: Thermomechanical Fatigue Of Superalloysmentioning

confidence: 99%

“…In traditional mechanics of fatigue crack initiation [1,12], the ''local approach'' refers to estimating notch root fields given remote applied loading. In contrast, global approaches use stress-life or strain-life relations based on the remote applied loading with some correction accounting for stress concentration at notches.…”

Section: Local and Global Perspectives Of Early Stage Fatigue Phenomenamentioning

confidence: 99%

“…The emphasis of this selective overview of fatigue is on approaches which establish links between microstructure, environmental and geometrical effects. The understanding of such complex and coupled phenomena is crucial to enable the structural integrity assessments of engineering components since they convey the information necessary to bridge local and global fields, and can incorporate aspects arising from materials processing, manufacturing, and the environment, amongst others [1][2][3]. This work will show that one of the most significant factors which has greatly contributed to our current understanding of fatigue behaviour in metallic materials at low and high temperatures has been the development of sophisticated testing, characterisation and visualisation techniques at the nanometer and micrometer length scales.…”

Section: General Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Failure of metals II: Fatigue

Pineau¹,

McDowell²,

Busso³

et al. 2016

Acta Materialia

239

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Section: Probabilistic Approaches To Account For Coupled Notchmicrostmentioning

confidence: 99%

Section: Thermomechanical Fatigue Of Superalloysmentioning

confidence: 99%

Section: Local and Global Perspectives Of Early Stage Fatigue Phenomenamentioning

confidence: 99%

Section: General Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Failure of metals II: Fatigue

Pineau¹,

McDowell²,

Busso³

et al. 2016

Acta Materialia

239

View full text Add to dashboard Cite

“…Prasannavenkatesan et al [74] have discussed the challenges in modeling transient cyclic deformation and microstructure refinement that can occur over many cycles in fully martensitic gear steels. Microstructure surrounding cracked or debonded inclusions may evolve and refine with the progression of localized cyclic plastic deformation and microstructurally small crack growth, potentially affected as well by environmental effects if near the surface.…”

Section: Challenges For Microstructure-sensitive Modeling In the Hcf mentioning

confidence: 99%

Computational micromechanics of fatigue of microstructures in the HCF–VHCF regimes

Musinski

2016

International Journal of Fatigue

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a b s t r a c tAdvances in higher resolution experimental techniques have shown that metallic materials can develop fatigue cracks under cyclic loading levels significantly below the yield stress. Indeed, the traditional notion of a fatigue limit can be recast in terms of limits associated with nucleation and arrest of fatigue cracks at the microstructural scale. Although fatigue damage characteristically emerges from irreversible dislocation processes at sub-grain scales, the specific microstructure attributes, environment, and loading conditions can strongly affect the apparent failure mode and surface to subsurface transitions. In this paper we discuss multiple mechanisms that occur during fatigue loading in the high cycle fatigue (HCF) to very high cycle fatigue (VHCF) regimes. We compare these regimes, focusing on strategies to bridge experimental and modeling approaches exercised at multiple length scales and discussing particular challenges to modeling and simulation regarding microstructure-sensitive fatigue driving forces and thresholds. We conclude by discussing some of the challenges in predicting the transition of failure mechanisms at different stress and strain amplitudes.

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Role of Non-metallic Inclusions and Twins on the Variability in Fatigue Life in Alloy 718 Nickel Base Superalloy

Texier

Stinville

Charpagne

et al. 2020

The Minerals, Metals &Amp; Materials Series

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Non-metallic inclusions (NMIs) and slip bands parallel to and slightly offset from twin boundaries are observed to be preferential sites for fatigue crack nucleation in wrought superalloys. Potential interactions between NMI cracking and slip activity within neighboring grains or at twin boundaries were investigated under monotonic tensile loading (up to 1.3% total strain) at room temperature. High resolution-and Heaviside-digital image correlation measurements were performed during interrupted tensile loading to identify strain localization, associated slip systems, and damage initiation. Different mechanisms and scenarios were identified: (1) Microplasticity generally starts at twin boundaries even at stresses as low as 70% of the macroscopic yield strength, (2) transgranular slip activity intensively develops above the macroscopic yield stress, (3) intense slip activity develops near and parallel to 21% of the twin boundaries intercepting NMIs, (4) 7% of the twin boundaries intercepting NMIs lead to slip-assisted NMI cracking, (5) no transgranular slip activity participates in NMI cracking, (6) the fraction of cracked NMIs progressively increases with the load, and (7) within the NMIs that initiated cracks, 67% cracked below 90% of the macroscopic yield strength without the presence of slip activity in the neighboring grains. While slip-assisted NMI cracking was evidenced in the present study, most NMI cracking is due to strain incompatibility between NMIs and neighboring grains at the high end of the elastic regime without slip interaction.

show abstract

Simulated extreme value fatigue sensitivity to inclusions and pores in martensitic gear steels

Cited by 44 publications

References 51 publications

Failure of metals II: Fatigue

Failure of metals II: Fatigue

Computational micromechanics of fatigue of microstructures in the HCF–VHCF regimes

Role of Non-metallic Inclusions and Twins on the Variability in Fatigue Life in Alloy 718 Nickel Base Superalloy

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