Evolution of Grain-Boundary Microstructure and Texture in Interstitial-Free Steel Processed by Equal-Channel Angular Extrusion

  • Ayan Bhowmik
  • Somjeet Biswas
  • Satyam Suwas
  • R.K. Ray
  • D. Bhattacharjee
Article

Abstract

The equal-channel angular extrusion (ECAE) of Ti-bearing interstitial-free (IF) steel was performed following two different routes, up to four passes, at a temperature of 300 °C. The ECAE led to a grain refinement to submicron size. After the second pass, the grain size attained saturation thereafter. The microstructural analysis indicated the presence of coincident-site lattice (CSL) boundaries in significant fraction, in addition to a high volume fraction of high-angle random boundaries and some low-angle boundaries after the deformation. Among the special boundaries, Σ3 and Σ13 were the most prominent ones and their fraction depended on the processing route followed. A deviation in the misorientation angle distribution from the Mackenzie distribution was noticed. The crystallographic texture after the first pass resembled that of simple shear, with the {112}, {110}, and {123} aligned to the macroscopic shear plane.

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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2009

Authors and Affiliations

  • Ayan Bhowmik
    • 1
  • Somjeet Biswas
    • 1
  • Satyam Suwas
    • 1
  • R.K. Ray
    • 2
  • D. Bhattacharjee
    • 2
  1. 1.Department of Materials EngineeringIndian Institute of ScienceBangaloreIndia
  2. 2.R&D DivisionTATA SteelJharkhandIndia

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