Characterization of creep–fatigue in ferritic 9Cr–1Mo–V–Nb steel using ultrasonic velocity

Kim, Chung Seok; Kwun, S.I.; Park, Ik Keun

doi:10.1016/j.jnucmat.2008.04.012

Cited by 14 publications

(6 citation statements)

References 22 publications

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“…The ultrasonic wave velocity may vary locally depending on a local treatment such as thermal processing of metal (annealing) [28] or cyclic loading (fatigue) [29]. A natural and local variation in sound speed is observed in concrete and rock materials.…”

Section: Noncollinear Wave Mixing Techniquementioning

confidence: 99%

A study of the noncollinear ultrasonic-wave-mixing technique under imperfect resonance conditions

2015

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Geometrical and material property changes cause deviations in the resonant conditions used for noncollinear wave mixing. These deviations are predicted and observed using the SV(ω1)+L(ω2)→L(ω1+ω2) interaction, where SV and L are the shear vertical and longitudinal waves, respectively, and ω1, ω2 are their frequencies. Numerical predictions, performed for the scattered secondary field in the far field zone, show three field features of imperfect resonance conditions: (1) rotation of a scattered beam, (2) decrease in the beam amplitude, and (3) beam splitting. The response of the nonlinear ultrasonic wave mixing technique is verified experimentally in two ways: (1) detection of a kissing bond between two polyvinyl chloride (PVC) plates, and (2) detection of subsurface micro-cracks in polymethyl methacrylate (PMMA). A predominant decrease in nonlinear wave energy is observed in both experiments. Beam rotation and splitting is observed in the kissing-bond experiment, while a minor increase in the nonlinear wave energy up to 100% is observed in the micro-cracked PMMA specimen.

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Section: Noncollinear Wave Mixing Techniquementioning

confidence: 99%

A study of the noncollinear ultrasonic-wave-mixing technique under imperfect resonance conditions

2015

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“…In recent years, linear laser ultrasonic techniques have been widely used in the non-destructive testing of physical and mechanical properties of materials [4][5][6][7][8][9][10][11][12][13]. However, acoustic parameter variations measured by linear ultrasonic technology are relatively small in response to early damage and change of materials and structures [14][15][16][17]. Nonlinear acoustic techniques are widely accepted for their higher sensitivity to the state of micro-structured and damaged materials, compared with linear acoustic techniques [14,[17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Monitoring of Thermal Aging of Aluminum Alloy via Nonlinear Propagation of Acoustic Pulses Generated and Detected by Lasers

Lomonosov

Shen

et al. 2019

Applied Sciences

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Nonlinear acoustic techniques are established tools for the characterization of micro-inhomogeneous materials with higher sensitivity, compared to linear ultrasonic techniques. In particular, the evaluation of material elastic quadratic nonlinearity via the detection of the second harmonic generation by acoustic waves is known to provide an assessment of the state variation of heat treated micro-structured materials. We report on the first application for non-destructive diagnostics of material thermal aging of finite-amplitude longitudinal acoustic pulses generated and detected by lasers. Finite-amplitude longitudinal pulses were launched in aluminum alloy samples by deposited liquid-suspended carbon particles layer irradiated by a nanosecond laser source. An out-of-plane displacement at the epicenter of the opposite sample surface was measured by an interferometer. This laser ultrasonic technique provided an opportunity to study the propagation in aluminum alloys of finite-amplitude acoustic pulses with a strain up to 5 × 10−3. The experiments revealed a signature of the hysteretic quadratic nonlinearity of micro-structured material manifested in an increase of the duration of detected acoustic pulses with an increase of their amplitude. The parameter of the hysteretic quadratic nonlinearity of the aluminum alloy (Al6061) was found to be of the order of 100 and to exhibit more than 50% variations in the process of the alloy thermal aging. By comparing the measured parameter of the hysteretic quadratic nonlinearity in aluminum alloys that were subjected to heat-treatment at 220 °C for different times (0 min, 20 min, 40 min, 1 h, 2 h, 10 h, 100 h, and 1000 h), with measurements of yield strength in same samples, it was established that the extrema in the dependence of the hysteretic nonlinearity and of the yield strength of this alloy on heat treatment time are correlated. This experimental observation provides the background for future research with the application goal of suggested nonlinear laser ultrasonic techniques for non-destructive evaluation of alloys’ strength and rigidity in the process of their heat treatment.

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“…It has been recognized as the preferable material and widely used in high-temperature structural components such as header and main steam pipe in advanced power plants in view of good high-temperature endurance, creep resistance properties, excellent heat conductivity, low thermal expansion coefficient and high performance-cost ratio. Additionally, it has also been widely used as a research benchmark for developing new ferritic heat-resistant steel with higher servicing temperature in Japan and Europe [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Variation of martensite phase transformation mechanism in minor-stressed T91 ferritic steel

Ning

Shi²,

Zhang³

et al. 2009

Journal of Nuclear Materials

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Characterization of creep–fatigue in ferritic 9Cr–1Mo–V–Nb steel using ultrasonic velocity

Cited by 14 publications

References 22 publications

A study of the noncollinear ultrasonic-wave-mixing technique under imperfect resonance conditions

A study of the noncollinear ultrasonic-wave-mixing technique under imperfect resonance conditions

Monitoring of Thermal Aging of Aluminum Alloy via Nonlinear Propagation of Acoustic Pulses Generated and Detected by Lasers

Variation of martensite phase transformation mechanism in minor-stressed T91 ferritic steel

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