Phased array inspection of large size forged steel parts

Dupont-Marillia, Frederic, Jahazi, Mohammad and Bélanger, Pierre. 2018. « Phased array inspection of large size forged steel parts ». In 44th Annual Review of Progress in Quantitative Nondestructive Evaluation (QNDE 2017) (Provo, UT, USA, July 16-21, 2017) Coll. « AIP Conference Proceedings », vol. 1949. American Institute of Physics.
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Abstract

High strength forged steel requires uncompromising quality to warrant advance performance for numerous critical applications. Ultrasonic inspection is commonly used in nondestructive testing to detect cracks and other defects. In steel blocks of relatively small dimensions (at least two directions not exceeding a few centimetres), phased array inspection is a trusted method to generate images of the inside of the blocks and therefore identify and size defects. However, casting of large size forged ingots introduces changes of mechanical parameters such as grain size, the Young’s modulus, the Poisson’s ratio, and the chemical composition. These heterogeneities affect the wave propagation, and consequently, the reliability of ultrasonic inspection and the imaging capabilities for these blocks. In this context, a custom phased array transducer designed for a 40-ton bainitic forged ingot was investigated. Following a previous study that provided local mechanical parameters for a similar block, two-dimensional simulations were made to compute the optimal transducer parameters including the pitch, width and number of elements. It appeared that depending on the number of elements, backwall reconstruction can generate high amplitude artefacts. Indeed, the large dimensions of the simulated block introduce numerous constructive interferences from backwall reflections which may lead to important artefacts. To increase image quality, the reconstruction algorithm was adapted and promising results were observed and compared with the scattering cone filter method available in the CIVA software.

Item Type:	Conference proceeding
Professor:	Professor Jahazi, Mohammad Bélanger, Pierre
Affiliation:	Génie mécanique, Génie mécanique
Date Deposited:	09 Jul 2018 18:51
Last Modified:	13 Apr 2023 16:08
URI:	https://espace2.etsmtl.ca/id/eprint/16838

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