Model Alloys to Study the Solute Drag and Precipitation Effect on the Recrystallization Kinetics of Nb-Microalloyed Steels

Stephanie Vervynckt; Philippe Thibaux; Martin Liebeherr; Yvan Houbaert

doi:10.4028/www.scientific.net/MSF.558-559.369

Paper Titles

3D Spatial Distribution of Nuclei in 90% Cold Rolled Aluminium
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In Situ EBSP Analysis of Grain Boundary Migration during Recrystallization in Pure Aluminum Foils
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Low Temperature Recrystallization of High Purity Iron Severely Deformed by ARB Process
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Recrystallization Deformation of Austenite, Microstructure of Martensite and Property of Rolled Steel Products
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Model Alloys to Study the Solute Drag and Precipitation Effect on the Recrystallization Kinetics of Nb-Microalloyed Steels
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Abnormal Subgrain Growth by Monte Carlo Simulation Based on Hot-Rolled AA5005 Aluminum Alloy Texture
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The Role of Zirconium Additions in Recrystallization of Aluminum Alloys
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Mapping Partially Recrystallised Structures by 3DXRD
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Effect of Annealing Temperature on Recrystallisation in Al (AA1200) Cold Rolled to a True Strain of 4
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HomeMaterials Science ForumMaterials Science Forum Vols. 558-559Model Alloys to Study the Solute Drag and...

Model Alloys to Study the Solute Drag and Precipitation Effect on the Recrystallization Kinetics of Nb-Microalloyed Steels

Abstract:

A good combination of strength and toughness in HSLA steels can be achieved by the addition of microalloying elements such as Nb. Nb can retard the static recrystallization of austenite at low temperatures by either a solute drag or by a precipitation pinning (when bonded to C or N) effect. Both mechanisms result in improved mechanical properties due to grain size refinement of the transformed ferrite. In this study, 3 Nb-microalloyed model alloys were designed to investigate the solute drag and the precipitation effect separately. The first alloy, containing a stoechiometric ratio of Nb and C, was designed to study the retarding effect of NbC on the recrystallization behavior. A second alloy, containing Nb and only few ppm C, was casted in order to study the effect of Nb in solid solution. The two alloys were compared with a C-Mn reference alloy. The recrystallization behavior of the three alloys were compared by multi-hit torsion tests and double hit compression tests. The Nb-C and the Nb-very low C showed small differences in recrystallization behavior. These results show that Nb delays the recrystallization by a solute drag effect or by the formation of a very small amount of precipitates.