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Mechanical Properties of Low-Temperature Bainite

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Abstract:

The mechanical properties of a bainitic microstructure with slender ferrite plates (20-65 nm in thickness) in a matrix of carbon-enriched retained austenite were characterized. The microstructure is generated by isothermal transformation at temperatures in the range 200-300°C. A yield strength as high as 1.5 GPa and an ultimate tensile strength between 1.77 to 2.2 GPa was achieved, depending on the transformation temperature. Furthermore, the high strength is frequently accompanied by ductility (£ 30%) and respectable levels of fracture toughness (< 45 MPa m0.5). This unusual combination of properties is attributed to the exceptionally fine scale of the carbidefree bainitic microstructure and the associated retained austenite.

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Periodical:

Materials Science Forum (Volumes 500-501)

Pages:

495-502

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.500-501.495

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Online since:

November 2005

Authors:

Carlos Garcia-Mateo, Francisca G. Caballero, Harshad K.D.H. Bhadeshia

Keywords:

Carbon Content, Dislocation Density, Low Temperature Bainite, Mechanical Property, Plate Thickness

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© 2005 Trans Tech Publications Ltd. All Rights Reserved

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