Development of a high strength high toughness ausferritic steel

A new ausferritic steel with high strength and exceptionally high fracture toughness has been developed. This steel has been synthesized integrating concepts from Austempered Ductile Cast Iron (ADI) technology. The influence of the austempering temperature on the microstructure and mechanical proper...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2009-07, Vol.513, p.329-339
Main Authors: Putatunda, Susil K., Singar, Arjun V., Tackett, Ronald, Lawes, Gavin
Format: Article
Language:English
Subjects:
Applied sciences
Austempering
Austenite
Ductility
Elasticity. Plasticity
Exact sciences and technology
Ferrite
Fracture toughness
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Strain hardening exponent
Tensile strength
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Summary:A new ausferritic steel with high strength and exceptionally high fracture toughness has been developed. This steel has been synthesized integrating concepts from Austempered Ductile Cast Iron (ADI) technology. The influence of the austempering temperature on the microstructure and mechanical properties of this steel at room temperature and ambient atmosphere has been examined. The effect of microstructure on the plane strain fracture toughness and on the magnetic, electrical, and thermal properties was also investigated. Compact tension and cylindrical tensile specimens prepared from the low alloy medium carbon steel with high silicon content were initially austenitized at 927 °C for 2 h and then subsequently austempered at several temperatures between 260 °C (500 F) and 400 °C (750 F) to produce different microstructures. The microstructures were characterized by X-ray diffraction, scanning electron microscopy and optical metallography. A combination of exceptionally high yield strength (1336 MPa) and a high fracture of toughness of 116 MPa√m (a value comparable to maraging steel) was obtained in this steel after austempering at 316 °C (600 F) for 2 h. Potential applications of this steel include the inexpensive fabrication of armored plates and components requiring high reliability and durability.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2009.02.013