Influence of prestraining on cyclic deformation behaviour and microstructure of a single-phase Ni-base superalloy

Schoeler, K; Christ, Hans‐Jürgen

doi:10.1016/s0142-1123(01)00039-1

Cited by 21 publications

(9 citation statements)

References 10 publications

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“…Below this critical cooling rate, higher cooling rates result in finer grain sizes. Combined with the results of the work of Miura et al, [26][27][28][29][30][31] it is reasonable to conclude that the fracture after fatigue erosion is a very important dendrite fragmentation mechanism in the grain refinement of semisolid slurry.…”

Section: Discussionmentioning

confidence: 76%

“…Wei␤ and Gottstein [27] have investigated the low-frequency fatigue of Al bicrystals deformed at temperatures up to 573 K with a frequency of 1.3 ϫ 10 Ϫ2 Hz and a strain amplitude of Ϯ0.01. Yavari and Langdon [28] and Raman et al [29,30,31] have carried out a series of low-frequency fatigue experiments using polycrystalline Al sheet samples at temperatures up to 773 K to investigate the migration of the grain boundary at high temperature. Their experiments provide an opportunity to observe the propagation of slip bands under high-temperature fatigue.…”

Section: A Model Of Fracture After Fatigue Erosionmentioning

confidence: 99%

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Microstructural stress concentration: An important role in grain refinement of rheocasting structure

Yang

Kang

2005

Metall Mater Trans A

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Though the mechanisms of dendrite fragmentation in agitated solidification are of great importance and have been investigated for many years, no accurate calculation of the stress fields of dendrites stirred in the metallic flow has been reported. In this study, the stress field and strain field of an aluminum dendrite model in moderate agitated fluid were calculated using the finite-element method. It was found that the stress concentrations at the roots of dendrite branches are so great that plastic deformation occurs when the fluid force is far from sufficient to bend the dendrite branches plastically. According to this calculation, a mechanism, detaching after fatigue erosion, was suggested. The new mechanism suggests that stress concentrations at the roots of dendrite branches create slip band intrusions and extrusions. These slip band intrusions and extrusions are thermally unstable and are soon remelted. If the erosion rate of the roots is sufficiently large, the roots will be thinned and dendrite branches will detach. Experiments on the effects of stirring intensity, cooling rate, and stirring time on the grain sizes of the A356 rheocasting structure, and reported high-temperature fatigue tests, corroborate the effectiveness of the new mechanism.

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Section: Discussionmentioning

confidence: 76%

Section: A Model Of Fracture After Fatigue Erosionmentioning

confidence: 99%

Microstructural stress concentration: An important role in grain refinement of rheocasting structure

Yang

Kang

2005

Metall Mater Trans A

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“…6. From the micrograph of the longitudinal cross-section of specimen LSP1-4, the emergence of two varied failure modes can be obtained: (i) the slip bands with crystallographic orientations [14][15][16] and (ii) the subgrain boundaries perpendicular to the external loading [17]. It is noteworthy that one can see void formation frequently occurring along the subgrain boundaries inside the material, see Fig.…”

Section: Crack Initiation and Fracture Surface Appearancementioning

confidence: 99%

Crack appearance of a laser shock-treated single crystal nickel-base superalloy after isothermal fatigue failure

Liu

Qiao

et al. 2017

Surface and Coatings Technology

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“…The three commonly used methods are: companion (single step), multiple step and incremental step test [12,13]. A discussion about the difference between the results obtained from these testing procedures is reported in [14,15].…”

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confidence: 99%

Comparison of Procedures to Evaluate the Cyclic Stress-Strain Curve from Incremental Step Test

Zonfrillo¹,

Nappini²

2015

JMEA

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The design of structural components in low-cycle fatigue field often requires the knowledge of the cyclic properties of the material, which are commonly described by the classical relation of Ramberg-Osgood. In order to obtain the cyclic curve using experimental data from incremental step tests, four methodologies are described and critically discussed. Three methods differ in the procedure of evaluation of the elastic modulus, while in the last one the experimental data are interpolated with a single non-linear regression. The various techniques were applied to data obtained from tests carried out on stainless steel specimens, and the resulting differences were analysed and quantified. An average behaviour was evaluated considering the total set of data obtained from experimental tests. The choice of the most suitable method is related to both the strain range of interest and the goal for which the results are used.

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Influence of prestraining on cyclic deformation behaviour and microstructure of a single-phase Ni-base superalloy

Cited by 21 publications

References 10 publications

Microstructural stress concentration: An important role in grain refinement of rheocasting structure

Microstructural stress concentration: An important role in grain refinement of rheocasting structure

Crack appearance of a laser shock-treated single crystal nickel-base superalloy after isothermal fatigue failure

Comparison of Procedures to Evaluate the Cyclic Stress-Strain Curve from Incremental Step Test

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