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Effect of composition and processing parameters on the formation of nano-bainite in advanced high strength steels

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journal contribution
posted on 2011-01-01, 00:00 authored by Ilana Timokhina, Hossein BeladiHossein Beladi, X Xiong, Peter HodgsonPeter Hodgson
The nano-bainitic microstructures were compared in a 0.79C-1.5Si-1.98Mn-0.24Mo-1.06Al (wt%) steel after isothermal heat-treatment and a Fe-0.2C-1.5Mn-1.2Si-0.3M0-0.6Al-0.02Nb (wt%) steel after controlled thermo-mechanical processing. The microstructure for both steels consisted of bainite. The microstructural characteristics of bainite, such as the morphology of the nano-bainite and thicknesses of bainitic ferrite and retained austenite layers, as a function of steel composition and processing was studied using transmission electron microscopy (TEM). It was found that the nano-bainitic structure can be formed in the low alloy steel through thermomechanical processing. Atom probe tomography (APT) was employed as a powerful technique to determine local composition distributions in three dimensions with atomic resolution. The important conclusions from the APT research were that the carbon content of bainitic ferrite is higher than expected from paraequilibrium level of carbon in ferrite for both steels and that Fe-C clusters and fine particles are formed in the bainitic ferrite in both steels despite the high level of Si.

History

Journal

Journal of iron and steel research international

Pagination

238 - 241

Location

[Beijing, China]

Open access

  • Yes

ISSN

1006-706X

Language

eng

Publication classification

C2 Other contribution to refereed journal

Copyright notice

2011, Gangtie Yanjiu Xuebao

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