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Kwun, S.I.; Hong, S. T.; Choo, W. Y.

doi:10.1023/a:1006779607608

Cited by 13 publications

(6 citation statements)

References 2 publications

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“…Ultrasonic parameters that can be effectively used to characterize material microstructures include ultrasonic velocity, ultrasonic attenuation coefficient, and nonlinear ultrasonic parameters . The ultrasonic velocity is directly related to mechanical properties, including the elastic modulus and the material density, which are influenced by microstructures such as grains, precipitates, and phase transformations [11][12][13][14][15]. The attenuation of ultrasonic waves depends on microstructural features such as grains, dislocations, inclusions, and pores based on absorption, diffraction, and scattering of ultrasonic waves by the microstructures [16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

“…Correlations between grain size and linear ultrasonic parameters, including ultrasonic velocity and attenuation coefficient, have been actively studied [12][13][14][15][17][18][19][20][21]. Ultrasonic velocities and scattering coefficients of plane longitudinal and shear waves in polycrystals as a function of grain size and wavenumber were theoretically explained by Hirsekorn [12].…”

Section: Introductionmentioning

confidence: 99%

“…Non-contact techniques such as electromagnetic acoustic transducers [19] and laser ultrasonics [20] were also studied to evaluate grain size. It has been reported that the ultrasonic velocity and the attenuation coefficient are also related to the mechanical properties affected by grain size, including hardness [5,10,21], yield strength [5,15], and tensile strength [10]. The increase in average grain size resulted in a decrease in mechanical properties (hardness and strength), which caused a decrease in ultrasonic velocity and an increase in attenuation coefficient.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of Linear and Nonlinear Ultrasonic Parameters in Characterizing Grain Size and Mechanical Properties of 304L Stainless Steel

Choi

Ryu

Kim

et al. 2019

Metals

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Ultrasonic nondestructive techniques can be used to characterize grain size and to evaluate mechanical properties of metals more practically than conventional destructive optical metallography and tensile tests. Typical ultrasonic parameters that can be correlated with material properties include ultrasonic velocity, ultrasonic attenuation coefficient, and nonlinear ultrasonic parameters. In this work, the abilities of these ultrasonic parameters to characterize the grain size and the mechanical properties of 304L stainless steel were evaluated and compared. Heat-treated specimens with different grain sizes were prepared and tested, where grain size ranged from approximately 40 to 300 μm. The measurements of ultrasonic velocity and ultrasonic attenuation coefficient were based on a pulse-echo mode, and the nonlinear ultrasonic parameter was measured based on a through-transmission mode. Grain size, elastic modulus, yield strength, and hardness were measured using conventional destructive methods, and their results were correlated with the results of ultrasonic measurements. The experimental results showed that all the measured ultrasonic parameters correlated well with the average grain size and the mechanical properties of the specimens. The nonlinear ultrasonic parameter provided better sensitivity than the ultrasonic velocity and the ultrasonic attenuation coefficient, which suggests that the nonlinear ultrasonic measurement would be more effective in characterizing grain size and mechanical properties than linear ultrasonic measurements.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Comparison of Linear and Nonlinear Ultrasonic Parameters in Characterizing Grain Size and Mechanical Properties of 304L Stainless Steel

Choi

Ryu

Kim

et al. 2019

Metals

View full text Add to dashboard Cite

show abstract

“…There are increasing needs to introduce nondestructive evaluation techniques for better time saving and economic quality control of steel products. [1][2][3][4][5][6][7][8][9][10][11][12][13][14] Magnetic, [1][2][3][4][5][6][7][8] Barkhausen noise, [9][10][11][12] ultrasonic 13) and electrical resistivity 14) methods have been applied to evaluate material properties nondestructively. Magnetic method, by which correlations between material properties and magnetic parameters such as coercivity, remanence, hysteresis loss and saturation magnetization can be obtained, is applicable to various kinds of ferromagnetic steels.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Evaluation of Microstructures and Strength of Eutectoid Steel

Byeon

Kwun

2003

Mater. Trans.

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Microstructures and strength of variously heat treated eutectoid steel were evaluated by magnetic property measurements. Isothermal transformation, continuous cooling or spheroidization heat treatment was performed to produce various microstructures. Microstructural parameters (phase, pearlite interlamellar spacing), mechanical properties (fracture strength) and magnetic parameters (coercivity, remanence, hysteresis loss, saturation magnetization) were measured to investigate the relationships among these parameters. Coercivity and remanence were observed to be high in order of martensite, pearlite and ferrite phase. The linear decrease of coercivity and remanence with the interlamellar spacing and the linear increase of those with fracture strength of pearlitic eutectoid steel were found. Coercivity and remanence were suggested as potential magnetic parameters for discriminating phases and quantitatively assessing the pearlite interlamellar spacing as well as strength of eutectoid steel.

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“…It is increasingly important to evaluate the level of creep damage for securing the reliability of the equipments. It is desirable to establish the process evaluating the creep damage nondestructively, as it is difficult or sometimes impossible to remove part of the component for analysis [1][2][3][4][5]. In order to evaluate the damage to structure nondestructively using in-situ monitoring, ultrasonic [1,2], magnetic [3,4] and electrical resistivity [5] methods have been employed.…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic Evaluation of Creep Damage of High Temperature Metallic Materials with Different Microstructures

Byeon¹,

Song²,

Kwun³

2004

KEM

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The creep damage levels of two metallic materials (PM1000 and IN738LC Ni based superalloy), which had different microstructures and creep damage mechanism, were evaluated by ultrasonic velocity and attenuation measurement. In case of PM1000 alloy, the ultrasonic velocity decreased with increasing creep time, which was mainly attributed to the decrease of Young's modulus due to the increasing volume fraction of creep cavity. Ultrasonic attenuation coefficient increased with increasing creep time in IN738LC alloy, while ultrasonic velocity showed no distinct trend. This increase of ultrasonic attenuation was attributed to the directional coarsening (rafting) of γ′ precipitates. A linear correlation was found between attenuation coefficient and mean length of γ′ precipitates.

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Cited by 13 publications

References 2 publications

Comparison of Linear and Nonlinear Ultrasonic Parameters in Characterizing Grain Size and Mechanical Properties of 304L Stainless Steel

Comparison of Linear and Nonlinear Ultrasonic Parameters in Characterizing Grain Size and Mechanical Properties of 304L Stainless Steel

Magnetic Evaluation of Microstructures and Strength of Eutectoid Steel

Ultrasonic Evaluation of Creep Damage of High Temperature Metallic Materials with Different Microstructures

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