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

Timokhina, Ilana, Beladi, Hossein, Xiong, Xiang and Hodgson, Peter 2011, Effect of composition and processing parameters on the formation of nano-bainite in advanced high strength steels, Journal of iron and steel research international, no. 1, pp. 238-241.

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Title Effect of composition and processing parameters on the formation of nano-bainite in advanced high strength steels
Author(s) Timokhina, Ilana
Beladi, Hossein
Xiong, Xiang
Hodgson, Peter
Journal name Journal of iron and steel research international
Issue number 1
Start page 238
End page 241
Publisher Gangtie Yanjiu Xuebao
Place of publication [Beijing, China]
Publication date 2011
ISSN 1006-706X
Summary 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.
Language eng
Field of Research 091207 Metals and Alloy Materials
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C2 Other contribution to refereed journal
Persistent URL http://hdl.handle.net/10536/DRO/DU:30044296

Document type: Journal Article
Collection: Centre for Material and Fibre Innovation
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