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Title

SELECTED DEVELOPMENTS IN NB-MICROALLOYED LONG PRODUCTS AND FORGINGS

Authorship

Speer, John G.; Whitley, Blake M.; Kaster, Stephanie L.; Findley, Kip O.; Matlock, David K.; Moor, Emmanuel De

Speer, John G.

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Whitley, Blake M.

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Kaster, Stephanie L.

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Findley, Kip O.

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Matlock, David K.

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Moor, Emmanuel De

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DOI

10.5151/9785-9785-32339

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Abstract

Niobium-microalloying technology has been increasingly applied in a wide range of steel applications over the past half-century, to increase strength, control microstructure, and enhance different application-specific properties. To achieve desired performance levels, thermomechanically processed microalloyed steels are widely supplied by the steel industry for high volume applications in hot-rolled plate, sheet and structural steels. However, in steel long products and forgings, the final properties are often generated by downstream users, after heat-treatment, surface hardening, forging or wire drawing This presentation highlights advancements associated with Nb-microalloying employed either individually or sometimes in combination with other elements, to enhance microstructures and properties developed during thermomechanical and/or downstream processing. Selected examples include the use of Nb as a solute or in precipitates for austenite grain size control in carburizing, and more recently for induction hardening, as well as recent work using Nb in high-carbon drawn pearlitic wire.

Keywords

Niobium, Grain refinement, Forging, Carburizing, Induction hardening