Creep damage assessment in titanium alloy using a nonlinear ultrasonic technique

Baby, Sony; Kowmudi, B. Nagaraja; Omprakash, C.M.; Satyanarayana, D.V.V.; Balasubramaniam, Krishnan; Kumar, Vikas

doi:10.1016/j.scriptamat.2008.06.028

Cited by 94 publications

(44 citation statements)

References 15 publications

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“…Baby et al employed a nonlinear ultrasonic technique to assess creep damage in titanium alloys. 17) The results have illustrated a noticeable increase in nonlinear parameters with respect to the creep voids.…”

Section: )mentioning

confidence: 87%

Creep Characterization in Advanced Heat-Resistant Steel Using Ultrasonic Nonlinearity Technique

Kim

2012

Mater. Trans.

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The creep of heat-resistant steel (12Cr3.45W alloy) is experimentally characterized to estimate damages using a nonlinear ultrasonic technique. The finite amplitude method has been used to measure the ultrasonic nonlinearity parameter in all creep damaged specimens by through transmitted longitudinal wave. The microstructure showed significant changes in precipitate size and dislocation density during creep. The normalized ultrasonic nonlinearity decreases significantly in stage I and decreases monotonously in stage II and stage III. However, the ultrasonic nonlinearity increase due to the formation of creep voids in the vicinity of the creep failure region. The correlation between the microstructural changes and ultrasonic nonlinearity is discussed.

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Section: )mentioning

confidence: 87%

Creep Characterization in Advanced Heat-Resistant Steel Using Ultrasonic Nonlinearity Technique

Kim

2012

Mater. Trans.

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“…It is evident from the (1) relationship that the applied torque T is critical in control of the bolt tension, which should guide further research in identified sources of excessive load application. At high temperatures creep deformation is associated with the synergistic effect of both microstructural changes and strain accumulation which leads to nucleation of voids, growth and coalescence and subsequently to failure [17]. However, in this case the component under examination (bolts) were not subject to high temperatures, rather than temperatures experienced during normal aircraft operation.…”

Section: Sem Examinationmentioning

confidence: 99%

Investigation of In-service Creep Failures of Aircraft Ti-6Al-4V Bolts

2018

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Abstract. Three Ti-6Al-4V bolts from mid-life jet aircraft failed during service operation. Each of the failed bolts were installed on a landing gear component. Metallurgical failure analysis indicated that the fracture mechanism is low temperature creep, possibly resulting from a sustained tension load over a long time. Visual inspection revealed ductile fracture morphology with no macroscopic deformation or corrosion. For all bolts fracture occurred close to the root at the first pitches of the thread. Scanning Electron Microscope (SEM) analysis revealed dimple morphologies with micro-void coalescence. Energy Dispersive X-Ray (EDX) analysis did not reveal any material deficiency that would have precipitated failure.

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“…Nonlinear ultrasound was briefly used to investigate neutron irradiation in copper crystals, and results showed that irradiation caused dislocations to be pinned [60]. It has also been shown that nonlinear ultrasound is related to tensile properties of cold worked stainless steel [61], and also creep damage in titanium alloys [62].…”

Section: Nonlinear Ultrasonicmentioning

confidence: 99%

Roadmap for Nondestructive Evaluation of Reactor Pressure Vessel Research and Development by the Light Water Reactor Sustainability Program

Smith¹,

Nanstad²,

Clayton³

et al. 2012

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Creep damage assessment in titanium alloy using a nonlinear ultrasonic technique

Cited by 94 publications

References 15 publications

Creep Characterization in Advanced Heat-Resistant Steel Using Ultrasonic Nonlinearity Technique

Creep Characterization in Advanced Heat-Resistant Steel Using Ultrasonic Nonlinearity Technique

Investigation of In-service Creep Failures of Aircraft Ti-6Al-4V Bolts

Roadmap for Nondestructive Evaluation of Reactor Pressure Vessel Research and Development by the Light Water Reactor Sustainability Program

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