Abstract—The peculiarities of the structure formation of low-carbon high-strength economically alloyed steel with guaranteed yield strength of 750 MPa are studied using EBSD analysis after hot plastic deformation an various temperatures simulated on a GLEEBLE 3800 plastometer. A comprehensive approach includes the estimation of the size of hardness austenite grains and their heterogeneity, as well as the construction of size distribution histograms of structural elements and angles of misorientations between them. The relative extent of small-angle boundaries is analyzed as well. The results are confirmed by study of sheet metal of thickness up to 40 mm manufactured under industrial conditions.
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Notes
Тkb is the critical brittleness temperature at which a fracture of a sample of natural thickness with a notch hub at a three-point static bend before rupture contains at least 70% of the fibrous component.
NDT is the critical brittleness temperature (nil-ductility transition temperature) defined as the maximum temperature of the rupture of a standard-size sample with a brittle cladding and a crack-like notch in the shock loading.
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Pazilova, U.A., Khlusova, E.I. & Kniaziuk, T.V. Influence of Hot Plastic Deformation Modes on the Structure and Properties of Quenched Hot Rolled Economically Alloyed High-Strength Steel. Inorg. Mater. Appl. Res. 9, 1051–1059 (2018). https://doi.org/10.1134/S207511331806031X
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DOI: https://doi.org/10.1134/S207511331806031X