Laser-ultrasonic monitoring of ferrite recovery in ultra low carbon steel

Smith, A. I.; Kruger, S. E.; Sietsma, Jilt; Zwaag, Sybrand van der

doi:10.1016/j.msea.2006.12.102

Cited by 8 publications

(5 citation statements)

References 40 publications

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“…Despite the noncontact advantage of the optical methods the results of their application for polycrystalline materials show limited dynamic range and frequency bandwidth, mainly due to the scattering of the probe pulse. With the exception of the results obtained for aluminum, which is a good example for a weakly scattering polycrystal, the studies considering attenuation in polycrystals reported measurements in the range below 50 MHz [8,9,28]. Nevertheless, the results obtained by both methods show that the attenuation decreases from the center to the edge of the specimen.…”

Section: Discussionmentioning

confidence: 91%

“…The nondestructive evaluation of the mechanical properties of such materials is an important task. Different techniques of ultrasound excitation and detection are employed in material sciences for the correlation of the changes of elastic properties and attenuation with microstructure [4][5][6][7][8][9]. Laser induced ultrasound provides essentially broadband probe pulses from few nanosecond down to tens of picoseconds, allowing a diversity of applications in material science and nondestructive methods [10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

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Hysteresis-like attenuation of ultrasound in severely plastically deformed nickel

Kozhushko

Paltauf

Krenn

2011

J. Phys.: Conf. Ser.

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Ultrasound attenuation was measured in nickel specimens of about 30 mm diameter prepared using the high pressure torsion technique. The cold working process produced an equivalent shear strain increasing from zero at the center up to 1000% at the edge of the specimen. The fragmentation of the grains due to multiple dislocations led to an ultrafine microstructure with large angle grain boundaries. The mean value of the grain size distribution gradually decreased from $ 50 mm at the center to 0.2 mm at the edge. Laser pulses of 5 ns were employed for the excitation of broadband ultrasound pulses covering the spectral range of 0.1-150 MHz. The ultrasound pulses were measured from the opposite side of the specimen by means of an optical interferometer and a piezoelectric foil transducer in two experimental setups. The features of the detected signal forms are discussed. The absolute value of the attenuation decreases from the center to the edge of the specimen showing nearly linear frequency dependence. The variation of the phase velocity was measured in a 6 mm-thick high pressure torsion nickel sample, revealing a velocity increase from the center to the edge.

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Section: Discussionmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Hysteresis-like attenuation of ultrasound in severely plastically deformed nickel

Kozhushko

Paltauf

Krenn

2011

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

show abstract

“…Despite the noncontact advantage of the optical methods the results of their application for polycrystalline materials show limited dynamic range and frequency bandwidth, mainly due to the scattering of the probe pulse. With the exception of the results obtained for aluminum, which is a good example for a weakly scattering polycrystal, the studies considering attenuation in polycrystals reported measurements in the range below 50 MHz [8,9,28] . Nevertheless, the results obtained by both methods show that the attenuation decreases from the center to the edge of the specimen.…”

Section: Discussionmentioning

confidence: 93%

“…The nondestructive evaluation of the mechanical properties of such materials is an important task. Different techniques of ultrasound excitation and detection are employed in material sciences for the correlation of the changes of elastic properties and attenuation with microstructure [4–9] . Laser induced ultrasound provides essentially broadband probe pulses from few nanosecond down to tens of picoseconds, allowing a diversity of applications in material science and nondestructive methods [10–14] .…”

Section: Introductionmentioning

confidence: 99%

Attenuation of ultrasound in severely plastically deformed nickel

Kozhushko

Paltauf

Krenn

et al. 2011

NDT & E International

View full text Add to dashboard Cite

Ultrasound attenuation was measured in nickel specimens of about 30 mm diameter prepared using the high pressure torsion technique. The cold working process produced an equivalent shear strain increasing from zero at the center up to 1000% at the edge of the specimen. The fragmentation of the grains due to multiple dislocations led to an ultrafine microstructure with large angle grain boundaries. The mean value of the grain size distribution gradually decreased from ∼50 μm at the center to 0.2 μm at the edge. Laser pulses of 5 ns were employed for the excitation of broadband ultrasound pulses covering the spectral range of 0.1–150 MHz. The ultrasound pulses were measured from the opposite side of the specimen by means of an optical interferometer and a piezoelectric foil transducer in two experimental setups. The features of the detected signal forms are discussed. The absolute value of the attenuation decreases from the center to the edge of the specimen showing nearly linear frequency dependence. The variation of the phase velocity was measured in a 6 mm-thick high pressure torsion nickel sample, revealing a velocity increase from the center to the edge.

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“…Steve D.Sharples [5](2003) constructed a fast laser-based surface acoustic wave (SAW) microscope. A.Smith [6](2006) used laser-ultrasound to monitor ferrite recovery in ultra low carbon steel.…”

Section: Laser Ultrasoundmentioning

confidence: 99%