Ultrafine Grained High Strength Low Alloy Steel with High Strength and High Ductility


Article Preview

In this study a C-Mn High Strength Low Alloy steel (HSLAs) was processed by quenching and austenite reverted transformation during annealing (ART-annealing), which results in an ultrafine grained duplex microstructure characterized by scanning electron microscopy equipped with electron back scattered diffraction, transmission electron microscopy and x-rays diffraction (SEM/EBSD, TEM and XRD). Microstructural observation revealed that the full hard martensitic microstucture gradually transformed into ultrafine grained duplex structure with austenite volume fraction up to 30% at specific annealing conditions. Mechanical properties of this processed steel measured by uniaxial tensile testing demonstrated that an excellent combination of strength (Rm~1GPa) and total elongation (A5~40%) at 30% metastable austenite condition in studied C-Mn-HSLAs. This substantially improved strength and ductility were attributed to the strain induced phase transformation of retained austenite dispersed throughout the ultrafine grained microstructure. At last it is proposed that ART-annealing is a promising way to produce high strength and high ductility steel products.



Materials Science Forum (Volumes 654-656)

Main Theme:

Edited by:

Jian-Feng Nie and Allan Morton




J. Shi et al., "Ultrafine Grained High Strength Low Alloy Steel with High Strength and High Ductility", Materials Science Forum, Vols. 654-656, pp. 238-241, 2010

Online since:

June 2010




[1] K. Sugimoto, T. Iida, J. Sakaguchi, T. Kashima, ISIJ, Vol. 9(2000), p.902.

[2] P.J. Jacques, E. Girault, ph. Harlet and F. Delannay, ISIJ, Vol. 431(2001), p.1061.

[3] L. Bracke, K. Verbeken, L. Kestens and J. Penning, Acta mater., Vol. 57 (2009), p.1512.

[4] A. A. Gazder, W. Q. Cao, C. H. J. Davies, E. V. Pereloma, Mater. Sci. & Engr. A497(2008), p.341.

[5] Q. Liu, X. Huang, D.J. Lloyd and N. Hansen, Acta mater, Vol. 50(2002), p.3789.