Compositional evolution of microalloy carbonitrides in a Mo-bearing microalloyed steel

Abstract

Molybdenum is known to affect microalloy precipitate evolution during processing in ferrite and austenite, but a unified explanation of the role of Mo in precipitate evolution is still lacking. Experiments and thermodynamic calculations indicate that Mo is incorporated into (Nb,Mo)(C,N) precipitates both in the hot-rolled condition and after reheating to 900 degrees C. Molybdenum enrichment is reduced after reheating and soaking at 1100 degrees C. No measurable segregation of Mo to the carbonitride-matrix interface was observed in any condition. (c) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.