Development of Ultra-Fine Grained Dual-Phase Steels: Mechanism of Grain Refinement during Inter-Critical Deformation

Anish Karmakar; R.D.K. Misra; Suman Neogy; Debalay Chakrabarti

doi:10.4028/www.scientific.net/MSF.783-786.674

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HomeMaterials Science ForumMaterials Science Forum Vols. 783-786Development of Ultra-Fine Grained Dual-Phase...

Development of Ultra-Fine Grained Dual-Phase Steels: Mechanism of Grain Refinement during Inter-Critical Deformation

Abstract:

Heavy deformation of metastable austenite (below A_e3) or both austenite and ferrite in the two-phase region (between A_r3 and A_r1) has been found to develop ultra-fine ferrite grain structures with average grain sizes less than 3 μm. The sequence of different dynamic softening mechanisms involved in the grain refinement during heavy intercritical deformation, such as, dynamic recovery, dynamic recrystallization, and dynamic strain induced austenite→ferrite transformation, has been analyzed by considering strain partitioning between austenite and ferrite. Grain refinement is expected to be dictated by dynamic strain induced transformation (DSIT) at higher deformation temperatures (>1100°C) and pronounced dynamic recovery of ferrite at lower deformation temperatures (<1100°C). Evolution of crystallographic texture was dependent on the grain refinement mechanism and gamma fiber components (ND//<111>) and alpha fiber components (RD//<110>) dominated the texture at higher and lower deformation temperatures, respectively.

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Periodical:

Materials Science Forum (Volumes 783-786)

Pages:

674-678

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.783-786.674

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Online since:

May 2014

Authors:

Anish Karmakar*, R.D.K. Misra, Suman Neogy, Debalay Chakrabarti

Keywords:

Dual Phase Steel, Dynamic Recrystallization (DRX), Dynamic Strain Induced Transformation, EBSD, Strain Partitioning, Ultrafine Grain

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