<p>A significant portion of failures in grade 91 and 92 steels have been attributed to poor fabrication that results from a high production variability. Developing a nondestructive technique that is capable of distinguishing between steel samples with different microstructural characteristics corresponding to acceptable and non-acceptable mechanical performance is critical to implementation of these alloys. Such a technique could potentially be used in a quality control scenario at production level, as well as to condition monitoring of installed components. Ultrasonic wave propagation characteristics such as attenuation and backscatter are influenced by the microstructure characteristics of the specimen, such as grain size and porosity, in a frequency-dependent manner. Therefore, the frequency-dependent parameters describing these phenomena may provide a volumetric way to assess the specimen’s microstructure. The objective of this work is to obtain frequency-dependent ultrasonic attenuation and backscatter measurements on a set of grade 91-92 samples with different heat treatments. The data was processed to extract features or metrics that can potentially be used to estimate the specimen’s microstructure. The main objective of this work is to investigate whether potential features or metrics extracted from the ultrasonic measurements can be correlated with the specimen’s microstructure characteristics in order to classify the specimen as acceptable or not.</p>

Ultrasonic Characterization of Grade 91 and 92 Steel With Different Heat Treatments

Paper Proceedings: https://asmedigitalcollection.asme.org/qnde/QNDE2021/volume/85529

ASME 2021 48th Annual Review of Progress in Quantitative Nondestructive Evaluation (QNDE2021)

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