Influence of Local Mechanical Parameters on Ultrasonic Wave Propagation in Large Forged Steel Ingots (english only)

Frederic Dupont-Marillia, Mohammad Jahazi, Serge Lafreniere, Pierre Belanger

Congratulations to Frederic Dupont-Marillia, R&D Project Manager at Nucleom & Post Doctoral Researcher at PulETS Laboratory, for his article publication “Influence of Local Mechanical Parameters on Ultrasonic Wave Propagation in Large Forged Steel Ingots” in the Journal of Non Destructive Evaluation 38: 73. DOI:



In numerous applications, high strength forged steel requires uncompromising quality and mechanical properties to provide advanced performances. Ultrasonic testing are commonly used for material characterization to measure mechanical properties and for nondestructive testing to detect flaws or other features contained in metallic objects. In steel blocks of relatively small dimensions (at least two dimensions not exceeding a few centimeters), temperature and homogeneity are well controlled during the solidification. However, these parameters may become difficult to control during manufacturing of large objects. Forging and heat treatments are known to modify the microstructure and/or the grain size, therefore affecting elastic properties, and consequently, the ultrasonic inspection reliability. In this context, the relationship between ultrasonic group and phase velocity variations with local properties of a forged and heat-treated 40,000 kg40,000 kg bainitic steel block manufactured in an industrial setting was investigated. The block was cut into a 20 mm20 mm thick slice that was then divided into 875 parallelepiped samples. A subset was selected for ultrasonic measurements, metallurgical study, and chemical analysis. Ultrasonic phase velocity showed a strong correlation with grain size, whereas group velocity was shown to vary as a function of the Young’s modulus and the chemical composition. Tensile testing was performed to validate the Young’s modulus calculated from the ultrasonic group velocities.



Copyright (2019) Journal of Non Destructive Evaluation. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the Journal of Non Destructive Evaluation.

Dupont-Marillia, F., Jahazi, M., Lafreniere, S. et al. J Nondestruct Eval (2019) 38: 73.

The following article appeared in the Journal of Non Destructive Evaluation and may be found here.

Read more:

Design and Optimisation of a Phased Array Transducer for Ultrasonic Inspection of Large Forged Steel Ingots

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