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Toughness of Advanced High Strength Bainitic Steels

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Abstract:

Carbide free bainite has achieved the highest strength and toughness combinations to date for bainitic steels in as-rolled conditions. By alloying designing and with the help of phase transformation theory, it was possible to improve simultaneously the strength and toughness because of the ultra-fine grain size of the bainitic ferrite plates. Ultimate tensile strengths ranging from 1600 MPa to 1800 MPa were achieved while keeping a total elongation higher than 10 %. Their toughness at room temperature matches tempered martensitic steels, known to be the best-in-class regarding this property. However, it has been observed that the presence of coalesced bainite leads to a dramatic deterioration in toughness in these novel high strength bainitic steels.

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Periodical:

Materials Science Forum (Volumes 638-642)

Pages:

118-123

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.638-642.118

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Online since:

January 2010

Authors:

Francisca G. Caballero, J. Chao, J. Cornide, Carlos Garcia-Mateo, Maria Jesus Santofimia, Carlos Capdevila

Keywords:

Coalesced Bainite, Steel, Toughness

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© 2010 Trans Tech Publications Ltd. All Rights Reserved

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