Bimodal Grain Size Distribution Enhances Strength and Ductility Simultaneously in a Low-Carbon Low-Alloy Steel

Autor(en)

Peter J. Szabo, David P. Field, Bertalan Joni, Jelena Horky, Tamas Ungar

Abstrakt

Low-carbon low-alloy steel specimens were quenched, then cold rolled, and finally annealed. Electron backscatter diffraction (EBSD) micrographs revealed a bimodal grain structure where ultra-fine grain structures with low-angle grain boundaries are alternating with regions of larger grains. The average total dislocation density was measured by X-ray line profile analysis, whereas the geometrically necessary dislocation density was obtained from the analysis of EBSD data. Using the combination of the Hall-Petch and Taylor equations, a good correlation was found between the total dislocation density and the measured flow stress in the different states of the alloy. The difference in evolutions of the total and the geometrically necessary component of the dislocation densities is discussed in terms of the successive processes of quenching, rolling, and annealing of the alloy.

Organisation(en)

Physik Nanostrukturierter Materialien

Externe Organisation(en)

Budapest University of Technology and Economics, Washington State University, Eötvös Loránd University Budapest, City University of Hong Kong (CityU)

Journal

Metallurgical and Materials Transactions A - Physical Metallurgy and Materials Science

Band

46

Seiten

1948-1957

Anzahl der Seiten

10

ISSN

1073-5623

DOI

https://doi.org/10.1007/s11661-015-2783-x

Publikationsdatum

05-2015

Peer-reviewed

Ja

ÖFOS 2012

103018 Materialphysik

Schlagwörter

ASJC Scopus Sachgebiete

Condensed Matter Physics, Mechanics of Materials, Metals and Alloys

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/b7de0b50-ce20-448c-8a2a-e9bb24260b00