Processing Low and Ultra-Low Carbon Bainitic Steels with Excellent Property Combinations

Abstract:

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Six experimental low and ultra-low carbon C-Mn-Mo-Nb-B and one conventional TMCP steel heats have been prepared to study the effects of chemical composition and hot deformation on the microstructure and the strength-toughness properties. In physical simulation tests, it was found that the deformation of austenite below the non-recrystallization temperature enhances the formation of higher-temperature bainitic morphologies and polygonal ferrite. On the other hand, hardness exhibits relatively low sensitivity to the degree of deformation below Tnr, whereas the deformation results in a distinct refinement in the microstructures, as determined by SEM-EBSD measurements, suggesting an improvement in the impact toughness. Simultaneous alloying with Mo-Nb-B seemed to be most efficient to provide high hardness and strength. Hot rolling trials indicated that the yield strength in the range 500-700 MPa with the excellent toughness down to –80 °C can be achieved in low carbon (≈ 0.03%) bainitic grades.

Info:

Periodical:

Materials Science Forum (Volumes 500-501)

Edited by:

J.M. Rodriguez-Ibabe, I. Gutiérrez, B. López and A. Iza-Mendia

Pages:

535-542

DOI:

10.4028/www.scientific.net/MSF.500-501.535

Citation:

P.P. Suikkanen et al., "Processing Low and Ultra-Low Carbon Bainitic Steels with Excellent Property Combinations ", Materials Science Forum, Vols. 500-501, pp. 535-542, 2005

Online since:

November 2005

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Price:

$35.00

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