Effects of room-temperature prestrain on creep-fracture behaviour of Nimonic 105

Burt, H.; Elliott, I.C.; Wilshire, B.

doi:10.1179/msc.1981.15.9.421

Cited by 19 publications

(7 citation statements)

References 4 publications

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“…In line with the differing property trends previously reported for 316 stainless steels and other materials, [1][2][3][4][5][6][7][8][9][10][11][12] the current data sets demonstrate that the creep behavior patterns displayed after room-temperature prestraining can differ markedly, depending on the compositions and initial microstructures of the samples and on the prestrain levels imposed.…”

Section: A Effects Of Varying Levels Of Room-temperature Prestrainsupporting

confidence: 82%

“…Moreover, these markedly different behavior patterns must be considered in relation to the apparently conflicting conclusions of earlier studies, which contend that, while the creep ductility is usually reduced, the creep rupture life (and even the minimum creep rate) can be increased, decreased, or unaffected by room-temperature prestraining. [2][3][4][5][6][7][8][9][10][11][12] Several investigations have demonstrated that the creep life may be decreased or increased depending on whether grain-boundary voids are formed on heating to the creep temperature after prestraining at room temperature. Thus, with oxygen-free high-conductivity (ofhc) copper, which had been annealed at 1073 K under a vacuum of better than 10 Pa, room-temperature prestraining did not lead to premature cavity development, so substantial reductions in m and f were accompanied by modest increases in t f .…”

Section: Dependence On Prestrain Effects On Materials Microstructurementioning

confidence: 99%

“…[8][9][10][11][12] Yet, depending on the material and its microstructure, while prestraining usually decreases the creep strain to failure, the rates of creep strain accumulation and the times to fracture may be increased, decreased, or unaffected by different prestrain treatments. Hence, to clarify the seemingly conflicting outcomes of earlier prestrain studies, the creep and creep fracture properties have been determined for three samples of 316 stainless steel produced with different compositions and initial microstructures.…”

Section: Introductionmentioning

confidence: 99%

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Mechanisms of strain accumulation and damage development during creep of prestrained 316 stainless steels

Wilshire

Willis

2004

Metall Mater Trans A

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The effects of prestraining at room temperature and at the creep temperature of 848 K, as well as the responses to stress reductions during creep, have been studied for 316 stainless steels varying in composition and initial microstructure. The results are analyzed by contrasting the strengthening effects achieved by introducing high dislocation densities prior to creep exposure with the deleterious effects, which can occur when prestraining causes premature void nucleation at grain boundaries. In addition, by recognizing the differing contributions made by the grain interiors and the grain boundary zones to the overall rates of creep strain accumulation, a consistent explanation is provided for the diverse creep behavior patterns reported for different metals and alloys after various prestraining treatments.

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Section: A Effects Of Varying Levels Of Room-temperature Prestrainsupporting

confidence: 82%

Section: Dependence On Prestrain Effects On Materials Microstructurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mechanisms of strain accumulation and damage development during creep of prestrained 316 stainless steels

Wilshire

Willis

2004

Metall Mater Trans A

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“…Investigations of the effects of prior room temperature prestrain on creep have been performed in copper [33], nickel [32,34] and aluminum [11]. Parker and Wilshire [33] show that tensile prestrain of 5 to 12.5 percent change both the primary and secondary creep rates, and that the secondary creep rate decreases with increasing levels of prestrain.…”

Section: Creep Deformation Mechanisms and Modelsmentioning

confidence: 99%

A Coupled Creep Plasticity Model for Residual Stress Relaxation of a Shot Peened Nickel-Base Superalloy

Buchanan¹,

John²,

Brockman³

et al. 2008

Superalloys 2008 (Eleventh International Symposium)

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Shot peening is a commonly used surface treatment process that imparts compressive residual stresses into the surface of metal components. Compressive residual stresses retard initiation and growth of fatigue cracks. During the component loading history, the shot-peened residual stresses may change due to thermal exposure, creep, and cyclic loading. In these instances, taking full credit for compressive residual stresses would result in a nonconservative life prediction. This paper describes a methodical approach for characterizing and modeling residual stress relaxation under elevated temperature loading, near and above the monotonic yield strength of IN100. The model incorporates the dominant creep deformation mechanism, coupling between the creep and plasticity models, and effects of prior plastic strain. The initial room temperature residual stress and plastic strain profiles provide the initial conditions for relaxation predictions using the coupled creep-plasticity model. Model predictions correlate well with experimental results on shot-peened dogbone specimens subject to single cycle and creep loading conditions at elevated temperature. The predictions accurately capture both the shape and magnitude of the retained residual stress profile.

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“…Age-hardenable nickel-based alloys of composition similar to alloy 740, which are primarily strengthened by the precipitation of gamma prime, all display significant decreases in rupture life and rupture ductility and a small increase in minimum creep rate when subjected to prior cold plastic deformation with pre-strain levels between 0.35 and 25% (Ref [7][8][9][10][11][12][13]. The reduction in creep ductility and rupture life is due to a marked increase in cavity density in the pre-strained material as compared to un-strained material (Ref 7,11).…”

Section: Background-cold-work and Creep Of Nickel-based Alloysmentioning

confidence: 99%

Testing and Analysis of Full-Scale Creep-Rupture Experiments on Inconel Alloy 740 Cold-Formed Tubing

Shingledecker

Pharr

2012

J. of Materi Eng and Perform

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Full-scale pressurized creep-rupture tests were conducted on Inconel Ò alloy 740 cold-formed tube bends to evaluate the effect of cold-work on the performance of tube bends for high-temperature creep applications. A new method of analysis is developed that can be used to simplify the complexities of structural (geometric) effects and material degradation due to cold-work. Results show that Inconel Ò alloy 740 behaves similarly to other age-hardenable nickel-based alloys subjected to cold-work prior to creep testing with large reductions in rupture life and ductility and a corresponding moderate increase in minimum creep rate. The results also demonstrate that the full-size test method can be a beneficial to understanding the performance of large components in service.

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Effects of room-temperature prestrain on creep-fracture behaviour of Nimonic 105

Cited by 19 publications

References 4 publications

Mechanisms of strain accumulation and damage development during creep of prestrained 316 stainless steels

Mechanisms of strain accumulation and damage development during creep of prestrained 316 stainless steels

A Coupled Creep Plasticity Model for Residual Stress Relaxation of a Shot Peened Nickel-Base Superalloy

Testing and Analysis of Full-Scale Creep-Rupture Experiments on Inconel Alloy 740 Cold-Formed Tubing

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