Microstructure and mechanical properties of high strength and high toughness micro-laminated dual phase steels

A series of steels with the micro-laminated dual phase microstructure were produced by hot rolling and air cooling processes in this study. Different volume fractions and morphology of the ferrite and martensite phases were obtained by adding different carbon contents in the steels containing 3wt% a...

Full description

Saved in:
Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2014-11, Vol.618, p.168-175
Main Authors: Zhang, M.D., Hu, J., Cao, W.Q., Dong, H.
Format: Article
Language:English
Subjects:
Anisotropy
Dual phase steel
Dual phase steels
Electron back scatter diffraction
Ferrite
Laminated material
Martensite
Mechanical properties
Mechanical property
Microstructure
Structural steels
Toughness
Volume fraction
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A series of steels with the micro-laminated dual phase microstructure were produced by hot rolling and air cooling processes in this study. Different volume fractions and morphology of the ferrite and martensite phases were obtained by adding different carbon contents in the steels containing 3wt% aluminum. The microstructure of the dual phase steels was examined by optical microscopy (OM), scanning electron microscopy (SEM) and electron backscatter diffraction (EBSD). It was shown that the microstructure was composed of large ferrite and martensite lamellae. Small martensite laths and a miniscule amount of residual austenite were also found in the martensite phase. The tensile, impact and hardness tests revealed that the dual phase steels had an excellent combination of mechanical properties. The mechanical properties had a great relationship with the martensite volume fraction and the micro-laminated microstructure. The fractography of impact specimens was examined to explore the toughening mechanism of the micro-laminated dual phase steels.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2014.08.073