Residual Stress Evaluation of a Shot Peening Specimen by Using a Rayleigh Wave

Lee, Taekgyu; Kim, Hak-Joon; Song, S.W.; Kwon, Sungduk

doi:10.3938/npsm.66.489

Cited by 1 publication

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“…Research has been conducted to evaluate the surface area characteristics of Rayleigh waves with these phenomena [ 12 , 13 , 14 , 15 ]. In addition, studies on the dispersion of Rayleigh waves, surface treatment of specimens, and prediction of residual stress using Rayleigh waves have been conducted [ 16 , 17 ], and the measurement of Rayleigh wave velocity has been studied with contact transducers, non-contact sensors, and minimum reflection measurement methods [ 17 , 18 , 19 , 20 , 21 ]. As such, many studies on residual stress evaluation using Rayleigh waves have been conducted nondestructively, but research on residual stress estimation using Rayleigh waves is insufficient and additional research is needed [ 17 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

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Nondestructive Evaluation of Residual Stress in Shot Peened Inconel Using Ultrasonic Minimum Reflection Measurement

Choi

Lee²,

Yeom

et al. 2023

Materials

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Shot peening is a process wherein the surface of a material is impacted by small, spherical metal shots at high velocity to create residual stresses. Nickel-based superalloy is a material with high strength and hardness along with excellent corrosion and fatigue resistance, and it is therefore used in nuclear power plants and aerospace applications. The application of shot peening to INCONEL, a nickel-based superalloy, has been actively researched, and the measurement of residual stresses has been studied as well. Previous studies have used methods such as perforation strain gauge analysis and X-ray diffraction (XRD) to measure residual stress, which can be evaluated with high accuracy, but doing so damages the specimen and involves critical risks to operator safety due to radiation. On the other hand, ultrasonic testing (UT), which utilizes ultrasonic wave, has the advantage of relatively low unit cost and short test time. One UT method, minimum reflection measurement, uses Rayleigh waves to evaluate the properties of material surfaces. Therefore, the present study utilized ultrasonic minimum reflectivity measurements to evaluate the residual stresses in INCONEL specimens. Specifically, this study utilized ultrasonic minimum reflection measurements to evaluate the residual stress in INCONEL 718 specimens. Moreover, an estimation equation was assumed using exponential functions to estimate the residual stress with depth using the obtained data, and an optimization problem was solved to determine it. Finally, to evaluate the estimated residual stress graph, the residual stress of the specimen was measured and compared using the XRD method.

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Section: Introductionmentioning

confidence: 99%

“…Due to the properties of this material, it is frequently exposed to extreme environments, something which causes material degradation and causes defects. Therefore, shot peening has been implemented and studied for a long time to increase the properties of this material [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%