On-line measurement of texture, thickness and plastic strain ratio using laser-ultrasound resonance spectroscopy

Moreau, A.; Lévesque, Daniel; Lord, M.; Dubois, Marc; Monchalin, Jean‐Pierre; Padioleau, C.; Bussière, J. F.

doi:10.1016/s0041-624x(02)00255-x

Cited by 67 publications

(44 citation statements)

References 13 publications

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“…Attenuation of the waves can be directly correlated with grain size. Laser ultrasonics is a remote, continuous and non-destructive technique that can be operated in situ at high temperatures for bulk observations [34][35][36][37]. In the present investigation the ultrasonic waves were generated using a frequency doubled Nd:YAG laser with a short (5 ns) and energetic (150 mJ) green (532 nm) light pulse.…”

Section: Methodsmentioning

confidence: 99%

“…An emerging alternative technique is laser ultrasonics [32,33]. The laser ultrasonics methodology recently developed specifically for metallurgical applications is a unique technique which allows in situ measurement of austenite grain size evolution with very good time resolution [34][35][36][37]. Further, just one test provides the entire grain growth curve for a given thermal cycle, whereas metallographic investigations would require a multiplicity of labour intensive examinations to obtain this curve.…”

Section: Introductionmentioning

confidence: 99%

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In situ measurement and modelling of austenite grain growth in a Ti/Nb microalloyed steel

et al. 2012

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In situ measurement and modelling of austenite grain growth in a Ti/Nb microalloyed steel Maalekian, M.; Radis, R.; Militzer, M.; Moreau, A.; Poole, W. J.In situ measurement and modelling of austenite grain growth in a Ti/Nb microalloyed steel Abstract Using a novel laser ultrasonics technique in situ measurements of austenite grain growth were conducted during continuous heating (10°Cs À1 ) and subsequent isothermal holding at various temperatures in the range 950-1250°C in a microalloyed linepipe steel. Based on the experimental results, a grain growth model was developed, which includes the pinning effect of precipitates present in the steel. Analyzing the grain growth behaviour and using the advanced thermo-kinetic software MatCalc, an approach was developed to estimate the initial distribution of precipitates in the as-received material and their dissolution kinetics. The evolution of the volume fractions and mean particle sizes of NbC and TiN leads to a time-dependent pinning pressure that is coupled with the proposed grain growth model to successfully describe the observed kinetics of austenite grain growth. The predictive capabilities of the model are illustrated by its application to independent grain growth data for rapid heat treatment cycles that are typical of the weld heat affected zone.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

In situ measurement and modelling of austenite grain growth in a Ti/Nb microalloyed steel

et al. 2012

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“…Measurements of microstructure evolution can now be conducted remotely and in realtime on a sample during thermomechanical treatments. Grain growth, phase transformation and recrystallization processes were successfully monitored by the laser ultrasonic technique in a wide range of materials such as steel, aluminium and zirconium alloys [3][4][5][6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Application of laser ultrasonics to monitor microstructure evolution in Inconel 718 superalloy

Garcin

Schmitt

Militzer

2014

MATEC Web of Conferences

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Abstract. Laser ultrasonics for metallurgy is an innovative sensor dedicated to the measurement of microstructure evolution during thermomechanical processing. In this technique, broadband ultrasound pulses are generated and detected with lasers. The properties of the ultrasounds are then related to the characteristics of the microstructure. Ultrasound attenuation is primary originated by the scattering at grain boundaries and its frequency dependence can be related to the grain size. The present work aims to introduce this technology as an exciting tool for metallurgists. As an illustration of its capability, the evolution of the grain size during isothermal annealing from a fine grained structure is in-situ monitored in an Inconel 718 superalloy. Laser ultrasonic measurements are compared with ex-situ metallography observations. Indication of heterogeneous grain growth is observed, correlated to the dissolution of δ-phase particles present in the initial structure. This preliminary study illustrates the potential of this new technique to monitor microstructure evolution in more complex scenarios including recrystallization during simulation of hot forging processes.

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“…This method has been used with some success using conventional piezoelectric transducers [4,5]. For texture measurement, the laser generation of both polarizations of shear waves has been investigated in recent years using resonance spectroscopy [6]. With moderately thick plates of steel however, the approach is not expected to work.…”

Section: Introductionmentioning

confidence: 99%

Determination of Crystallographic Texture in Steel Plates Using Laser-Generated Surface Waves

Lévesque¹,

Lim²,

Padioleau³

et al. 2011

AIP Conference Proceedings

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ABSTRACT.A laser-ultrasonic approach based on the propagation of surface skimming longitudinal wave (P-wave) and Rayleigh wave (SAW) is investigated for the measurement of crystallographic texture in moderately thick steel plates. The angular dependence of the P-wave and SAW velocities presents different patterns, both of amplitude of a few % attributed to texture. Results obtained from fitting the angular profiles usingr elevante xpressions for P-wave and SAW confirm that texture coefficients may accurately be measured by this approach. Moreover, the difference of the P-wave and SAW profiles is shown to be very robust against small path length changes or other detrimental effects such as surface roughness. For actual measurements on large plates, a solution based on the rotation of a generation line using an axicon lens is tested. Texture variations across the width of steel plates and the influence of residual stress are discussed.

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On-line measurement of texture, thickness and plastic strain ratio using laser-ultrasound resonance spectroscopy

Cited by 67 publications

References 13 publications

In situ measurement and modelling of austenite grain growth in a Ti/Nb microalloyed steel

In situ measurement and modelling of austenite grain growth in a Ti/Nb microalloyed steel

Application of laser ultrasonics to monitor microstructure evolution in Inconel 718 superalloy

Determination of Crystallographic Texture in Steel Plates Using Laser-Generated Surface Waves

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