Ultrasonic characterization for directional coarsening in a nickel-based superalloy during creep exposure

Kim, Chung-Seok; Hyun, Chang-Yong; Park, Ik Keun; Jhang, Kyung-Young

doi:10.1080/00223131.2012.669238

Cited by 6 publications

(3 citation statements)

References 21 publications

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“…are accompanied by obvious nonlinear behavior [5]. In the application of nonlinear theory, scholars have mostly adopted the second-order classic nonlinear coefficient to study the nonlinear phenomenon of sound waves [6,7], which has been supposed to be valid for testing material properties such as degradation, including fatigue [8][9][10], creep [11], thermal aging [12,13] and micro-cracks [14][15][16]. Meanwhile, the second-order nonlinear technology has also been used to evaluate the early damage of the coating.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Damage Process of a Coating by Using Nonlinear Ultrasonic Method

Zhou

et al. 2021

Coatings

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During the service or external loading of the surface coating, the damage accumulation may develop in the coating or at the interface between the substrate and the coating, but it is difficult to measure directly in the early stage, so the acoustic nonlinear parameters are used as the early damage index of the coating. In this paper, the nonlinear wave motion equation is solved by the perturbation method and the new relationship between the relative ratio of second-order parameter and third-order parameter was derived. The nonlinear ultrasonic testing system is used to detect received signals during tensile testing of for the specimen with Al2O3 coatings. It is found that when the stress is less than 260 MPa, the appearance of the coating has no obvious change, but the nonlinear coefficients measured by the experiment increase with the increase of the tensile stress. By comparing the curves of nonlinear coefficients and stress respectively, the fluctuation of curves the second-order nonlinear coefficient A2 and the relative nonlinear coefficient β′ to stress is relatively small, and close to the linear relationship with the tensile stress, which indicates that the two parameters of the specimen with Al2O3 coatings are more sensitive to the bonding conditions, and can be used as an evaluation method to track the coating damage.

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Section: Introductionmentioning

confidence: 99%

Evaluation of Damage Process of a Coating by Using Nonlinear Ultrasonic Method

Zhou

et al. 2021

Coatings

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“…Until now, many researchers have focused on the second-order nonlinear parameter b, which has been considered to be effective for inspecting material properties such as degradation, including fatigue [12][13][14][15][16][17], creep [18], thermal aging [19,20] [21][22][23][24][25]. In recent years, however, the third-order nonlinear parameter c, is also becoming a significant indicator in evaluating material degradations.…”

Section: Introductionmentioning

confidence: 99%

Relationship between second- and third-order acoustic nonlinear parameters in relative measurement

2015

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“…Ultrasonic attenuation coefficient is sensitive for voids dispersed in solid materials, such as porosity in composites and creep cavity in metals. It is reported that attenuation coefficient showed a good performance for creep damage evaluation in metals [4,5,6,7].…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic Inspection for Metal Creep Based on Flight-Time-Attenuation

Yuan

Han

Zhou

et al. 2014

AMM

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Attenuation coefficient is frequently-used for ultrasonic creep inspection in metals. However, in practical inspecting, e.g. thick wall weldment in high temperature pipings, it is usually difficult to measure the accurate propagating distance of ultrasound, which results in an inaccuracy of attenuation coefficient calculation. Therefore, a modified method for attenuation coefficient calculating was proposed here, in which the flight-time of ultrasound was substituted for propagating distance. The new calculated attenuation coefficient was named as flight-time-attenuation parameter, and had a unit as dB/us. A uniaxial tension creep experiment with pure lead was conducted to verify the detecting ability of this new parameter. Two piezoelectric wafers were pasted on the pure lead specimen, and ultrasonic testing was carried out simultaneously without interrupting the tension procedure. Attenuation coefficient and flight-time-attenuation parameter were calculated with inspecting signal acquired from creep specimen, and compared with each other. The results showed that two ultrasonic parameters had the same variation tendency along with creep procedure, and flight-time-attenuation parameter had a better sensitivity. Accordingly, the flight-time-attenuation parameter could be used for ultrasonic creep inspection in metals, and worked as a replacement of attenuation coefficient calculated with propagating distance. Another creep inspecting experiment with P91 steel weldments was conducted to verify the practicability of the new parameter, in which the new flight-time-attenuation parameter showed a good distinguishing ability for different creep status.

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Ultrasonic characterization for directional coarsening in a nickel-based superalloy during creep exposure

Cited by 6 publications

References 21 publications

Evaluation of Damage Process of a Coating by Using Nonlinear Ultrasonic Method

Evaluation of Damage Process of a Coating by Using Nonlinear Ultrasonic Method

Relationship between second- and third-order acoustic nonlinear parameters in relative measurement

Ultrasonic Inspection for Metal Creep Based on Flight-Time-Attenuation

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