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Silvia Barella, Andrea Gruttadauria, Carlo Mapelli, Davide Mombelli, Claudia Lisiane Fanezi, Fabio Fioletti, Michele Formentelli and Margherita Guarneri Effect of Heat Treatment and of Primary Austenite Grain Size on the Minimum Size of Detectable Defect on 26NiCrMoV11.5 High Strength Steel Advanced Engineering Materials 16

Version of Record online: 23 AUG 2013 | DOI: 10.1002/adem.201300137

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Ultra-sonic test values are significantly affected by the microstructural features. Prior austenite grain (PAG) cover a fundamental role in UT sensitivity. PAG drives the martensite block misorientations, grain size, and crystal lattice orientation, main responsible of ultrasound wave attenuation. Interesting correlation between UT and PAG are discovered and discussed, aiming to define a practical rule could be attended in industrial practice.

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