Investigation of fatigue crack incubation and growth in cast MAR-M247 subjected to low cycle fatigue at room temperature

Yeratapally, Saikumar R.; Hochhalter, Jacob; Ruggles, Timothy; Sangid, Michael D.

doi:10.1007/s10704-017-0213-3

Cited by 15 publications

(5 citation statements)

References 47 publications

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“…The Ni base exhibits limited solubility to these trace elements. The trace elements interact with Ni in the base during welding, to form a low-melting-point eutectic phase, and segregate at the grain boundaries, leading to the precipitation of brittle carbides [18][19][20] during welding, resulting in clear hot cracks on the weld bead. This is also one of the main reasons that MAR-M247 is not applicable for repair welding.…”

Section: Introductionmentioning

confidence: 99%

Impact of electromagnetic stirring on the gas metal arc welding of an MAR-M247 superalloy

Yu-Chih

Lu²,

Chen

2021

Int J Adv Manuf Technol

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In this paper, the impact of electromagnetic stirring (EMS) on the gas metal arc welding (GATW) of an MAR-M247 superalloy was investigated. Results revealed that, without electromagnetic stirring, it was easy for carbides in the heat-affected zone (HAZ) of the weld bead to liquefy during welding, leading to weld bead cracks. Electromagnetic stirring re ned the grains in the HAZ and the weld bead, leading to grain strengthening and subsequently resulting in the effective improvement in the hardness of the weld bead. In addition, electromagnetic stirring signi cantly facilitated the formation of the weld bead by the removal of large inclusions which in turn effectively improved crack resistance at the joint. It also accelerated the oating up of gas holes thereby reducing the generation of gas hole defects.

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Section: Introductionmentioning

confidence: 99%

Impact of electromagnetic stirring on the gas metal arc welding of an MAR-M247 superalloy

Yu-Chih

Lu²,

Chen

2021

Int J Adv Manuf Technol

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“…Typical measurements and data associated with such relationships include load (stress), displacement (strain), and associated properties (eg, mean stress and strain, energy dissipation, and residual stiffness). In the case of metals, localized plastic deformation due to cyclic loading may occur at the highest stress locations, leading to the incubation of fatigue cracks in the microstructure . Ultimate failure due to fatigue is usually driven, though, by a defining crack at a length scale higher than the microstructure, the growth of which is linked to a criterion for crack advancement.…”

Section: Introductionmentioning

confidence: 99%

“…In the case of metals, localized plastic deformation due to cyclic loading may occur at the highest stress locations, leading to the incubation of fatigue cracks in the microstructure. [7][8][9][10][11] Ultimate failure due to fatigue is usually driven, though, by a defining crack at a length scale higher than the microstructure, the growth of which is linked to a criterion for crack advancement. To define such criteria, defined based on stress and strain fields or some other related mechanical quantity that characterizes loading intensity, are needed to determine the potential of a crack to satisfy the growth criteria at any point of fatigue.…”

Section: Introductionmentioning

confidence: 99%

The use of nondestructive evaluation methods in fatigue: A review

Wisner

Mazur

Kontsos

2020

Fatigue Fract Eng Mat Struct

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Efforts to understand fatigue in materials generally rely on defining relationships between the material response to fatigue loading and the evolving remaining material life portion. Typical measurements and data associated with such relationships include load (stress), displacement (strain), and associated properties (eg, mean stress and strain, energy dissipation, and residual stiffness). In addition to obtaining such measurements, efforts have been made to leverage nondestructive evaluation (NDE) methods to obtain additional information and enhance the description of the material fatigue response, especially its evolution due to interacting material‐microstructure‐property relationships. Given the range of available NDE methods and the number of materials they can be applied to, a critical overview of related investigations is presented in this article. Specifically, the state of the art of applying optical, thermal, acoustic, electromagnetic, X‐ray, and other diffraction NDE methods in fatigue investigations is provided and discussed. The methods are individually described for background and defining their relationship to fatigue, followed by descriptions of their current uses and contributions to enhancing the understanding of fatigue, and their limitations and ways that improvements could be made.

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“…Material degradation, for example, the initiation and propagation of fatigue cracks, is a critical problem for science and engineering. 1–8 Nondestructive evaluation (NDE) techniques such as ultrasonics using bulk waves 9 have become valuable tools for monitoring this degradation and its effect. The development of phased arrays has improved damage imaging resolution and range.…”

Section: Introductionmentioning

confidence: 99%

IWSHM 2017: Damage-scattered wave extraction in an integral stiffened isotropic plate: a baseline-subtraction-free approach

Leser

et al. 2018

Structural Health Monitoring

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Ultrasonic guided waves enable long-distance inspection of structures for health monitoring purposes. However, this capability is diminished when applied to complex structures where damage-scattered waves are often buried by scattering from various structural components or boundaries in the time–space domain. Here, a baseline-subtraction-free inspection concept based on the Radon transform is proposed to identify and separate these scattered waves from those scattered by damage. The received time–space domain signals can be converted into the Radon domain, in which the scattered signals from structural components are suppressed into relatively small regions such that damage-scattered signals can be identified and extracted. In this study, a piezoelectric wafer and a linear scan via laser Doppler vibrometer were used to excite and acquire the Lamb wave signals in an aluminum plate with multiple stiffeners. Linear and inverse linear Radon transform algorithms were applied to the direct measurements. Currently, this method needs baseline measurements for comparison in the Radon domain, but avoids baseline subtraction. The results demonstrate the effectiveness of the Radon transform as an extraction tool for damage-scattered waves in a stiffened aluminum plate for a damage site in the bay area between two stiffeners and also suggest the possibility of generalizing this technique for application to a wide variety of complex, large-area structures.

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Investigation of fatigue crack incubation and growth in cast MAR-M247 subjected to low cycle fatigue at room temperature

Cited by 15 publications

References 47 publications

Impact of electromagnetic stirring on the gas metal arc welding of an MAR-M247 superalloy

Impact of electromagnetic stirring on the gas metal arc welding of an MAR-M247 superalloy

The use of nondestructive evaluation methods in fatigue: A review

IWSHM 2017: Damage-scattered wave extraction in an integral stiffened isotropic plate: a baseline-subtraction-free approach

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