Ultrasonic and structural characterization of anisotropic austenitic stainless steel welds: Towards a higher reliability in ultrasonic non-destructive testing

Chassignole, Bertrand; Guerjouma, Rachid El; Ploix, Marie-Aude; Fouquet, Thierry

doi:10.1016/j.ndteint.2009.12.005

Cited by 69 publications

(33 citation statements)

References 17 publications

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“…The material properties were considered to be transversely isotropic, and symmetrically orientated with respect to the plane of the cross-section, so that a two dimensional model can be applied, however in reality the orientation of the polycrystal grains in the weld may be tilted slightly out of the plane [10]. A more accurate approach would be to consider the material properties of the weld to be orthotropic [30], and apply a three dimensional model to describe the weld map. Another assumption in the weld modelling is to consider the elastic constants to be the same everywhere in the weld, with the only variable being the rotation angle of the stiffness matrix according to the positions.…”

Section: Discussionmentioning

confidence: 99%

Nonintrusive estimation of anisotropic stiffness maps of heterogeneous steel welds for the improvement of ultrasonic array inspection

Fan

Mark

Lowe

et al. 2015

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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It is challenging to inspect austenitic welds non-destructively using ultrasonic waves because the spatially varying elastic anisotropy of weld microstructures can lead to the deviation of ultrasound. Models have already been developed to predict the propagation of ultrasound in such welds once the weld stiffness heterogeneity is known. Consequently, it would be desirable to have a means of measuring the variation in elastic anisotropy experimentally so as to be able to cor-

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Section: Discussionmentioning

confidence: 99%

Nonintrusive estimation of anisotropic stiffness maps of heterogeneous steel welds for the improvement of ultrasonic array inspection

Fan

Mark

Lowe

et al. 2015

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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“…This work was further developed to analyse attenuation of the beam [14], comparison to the pulse-echo amplitude of Side-Drilled-Holes in a mock-up weld [15], and structural noise in a multiple-scattering environment [16].…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic array imaging through an anisotropic austenitic steel weld using an efficient ray-tracing algorithm

Nowers

Duxbury

Drinkwater³

2016

NDT & E International

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Ultrasonic inspection of austenitic welds is challenging due to their highly anisotropic and heterogeneous microstructure. The weld anisotropy causes a steering of the ultrasonic beam leading to a number of adverse effects upon ultrasonic array imagery, including defect mislocation and aberration of the defect response. A semi-analytical model to simulate degraded ultrasonic images due to propagation through an anisotropic austenitic weld is developed. Ray-tracing is performed using the A* path-finding algorithm and integrated into a semi-analytical beam-simulation and imaging routine to observe the impact of weld anisotropy on ultrasonic imaging. Representative anisotropy weld-maps are supplied by the MINA model of the welding process. A number of parametric studies are considered, including the magnitude and behaviour of defect mislocation and amplitude as the position of a fusion-face defect and the anisotropy distribution of a weld is varied, respectively. Furthermore, the use of the model to efficiently simulate and evaluate ultrasonic image degradation due to anisotropic austenitic welds during an inspection development process is discussed.

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“…It is indicated by the fact that wave velocities become directionally dependent; group and phase velocities are no longer necessarily parallel or equal in magnitude [4]. The assumption of the weld being two dimensional and transversely isotropic is often used [5,6] and has recently also been experimentally validated [7]. Furthermore, the grain orientation is believed to be an essential factor that affects the propagation of ultrasound.…”

Section: Introductionmentioning

confidence: 99%

An ultrasonic methodology to non-destructively estimate the grain orientation in an anisotropic weld

Wirdelius

2014

MATEC Web of Conferences

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Abstract. The initial step towards a non-destructive technique that estimates grain orientation in an anisotropic weld is presented in this paper. The purpose is to aid future forward simulations of ultrasonic NDT of this kind of weld to achieve a better result. A forward model that consists of a weld model, a transmitter model, a receiver model and a 2D ray tracing algorithm is introduced. An inversion based on a multi-objective genetic algorithm is also presented. Experiments are conducted for both P and SV waves in order to collect enough data used in the inversion. Calculation is conducted to fulfil the estimation with both the synthetic data and the experimental data. Concluding remarks are presented at the end of the paper.

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Ultrasonic and structural characterization of anisotropic austenitic stainless steel welds: Towards a higher reliability in ultrasonic non-destructive testing

Cited by 69 publications

References 17 publications

Nonintrusive estimation of anisotropic stiffness maps of heterogeneous steel welds for the improvement of ultrasonic array inspection

Nonintrusive estimation of anisotropic stiffness maps of heterogeneous steel welds for the improvement of ultrasonic array inspection

Ultrasonic array imaging through an anisotropic austenitic steel weld using an efficient ray-tracing algorithm

An ultrasonic methodology to non-destructively estimate the grain orientation in an anisotropic weld

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