Development of a System to Measure Austenite Grain Size of Plate Steel Using Laser-Based Ultrasonics

Lim, C. S.; Hong, S. T.; Yi, Jianglong; Choi, Sang-Woo; Oh, K. J.; Nagata, Yasuaki; Yamada, Hisao; Hamada, N.

doi:10.1063/1.2718099

Cited by 3 publications

(1 citation statement)

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“…Owing to its non-contact nature, laser ultrasonics (LUS) has been gaining attention as an in-situ monitoring technique in steel manufacturing lines [4][5][6][7] . Laser ultrasonics has been reported to successfully measure phase transformations in steels during continuous cooling, as benchmarked with conventional techniques including dilatometry [8][9][10][11] .…”

Section: Introductionmentioning

confidence: 99%

<i>In-situ</i> Laser Ultrasonics Measurements of Ferrite Formation during Stepped Cooling of A 0.1C-2Mn Dual Phase Steel

Hayashi,

Rodrigues,

Militzer

2024

ISIJ Int.

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Dual-phase (DP) steels are advanced high-strength steels used in automotive design. To achieve optimal mechanical properties the control of phase transformations during processing is paramount, e.g. for hot-rolled DP steels a desired ferrite fraction is required to form during run-out table cooling. Thus, sensor technologies such as laser ultrasonics (LUS) are of considerable interest that can in-situ monitor ferrite formation. In this study, the ferrite formation kinetics in a laboratory DP steel were measured by LUS during stepped cooling treatments which were designed to simulate the cooling paths on the run-out table in hot strip mills. LUS measurements were first validated with well-established dilatometry measurements during continuous cooling. For the stepped cooling tests, the fractions transformed obtained from the ultrasonic velocity changes agree with the ferrite phase fractions as characterized by ex-situ metallography. Further, the velocity changes are described by the JMAK approach using parameters that are consistent for the austenite-toferrite transformation in low-carbon steels.

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Section: Introductionmentioning

confidence: 99%

<i>In-situ</i> Laser Ultrasonics Measurements of Ferrite Formation during Stepped Cooling of A 0.1C-2Mn Dual Phase Steel

Hayashi,

Rodrigues,

Militzer

2024

ISIJ Int.

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Development of a System to Measure Recrystallization Ratio of Plate Steel Using Laser-Based Ultrasonics

Nagata¹,

Yamada²,

Hamada

et al. 2007

AIP Conference Proceedings

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Grain Size Measurement in Steel by Laser Ultrasonics Based on Time Domain Energy

Yin

Yang

2015

Mater. Trans.

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Laser ultrasonics, a technique based on the generation of ultrasonic waves by a pulsed laser and on their detection by a laser interferometer, can be used to determine grain sizes in steels. The absolute values of the average grain size can be calculated directly from the attenuation measurements of ultrasonic longitudinal bulk waves. The general methods of attenuation measurements are computed based on the amplitude of longitudinal waves. In fact, the amplitude as only one value is infected by the noise. Besides, the attenuation should be considered as the energy reduction. The method of time domain energy is proposed to compute the attenuation. The results indicate that time domain energy can improve the accuracy of the grain size prediction. The laser ultrasonic technique may be incorporated online for direct measurements of grain size during steel production.

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Development of a System to Measure Austenite Grain Size of Plate Steel Using Laser-Based Ultrasonics

Cited by 3 publications

References 1 publication

<i>In-situ</i> Laser Ultrasonics Measurements of Ferrite Formation during Stepped Cooling of A 0.1C-2Mn Dual Phase Steel

<i>In-situ</i> Laser Ultrasonics Measurements of Ferrite Formation during Stepped Cooling of A 0.1C-2Mn Dual Phase Steel

Development of a System to Measure Recrystallization Ratio of Plate Steel Using Laser-Based Ultrasonics

Grain Size Measurement in Steel by Laser Ultrasonics Based on Time Domain Energy

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