Effect of annealing on the microstructure and mechanical properties of cold rolled Fe-24Mn-3Al-2Si-1Ni-0.06C TWIP steel

RIS ID

44817

Publication Details

Santos, D. B., Saleh, A. A., Gazder, A. A., Carman, A., Duarte, D. M., Ribeiro, E. A. S., Gonzalez, B. M. Pereloma, E. V. (2011). Effect of annealing on the microstructure and mechanical properties of cold rolled Fe-24Mn-3Al-2Si-1Ni-0.06C TWIP steel. Materials Science and Engineering A: Structural Materials: Properties, Microstructure and Processing, 528 (10-11), 3545-3555.

Abstract

Fe–24Mn–3Al–2Si–1Ni–0.06C TWinning Induced Plasticity (TWIP) steel was 42% cold-rolled and isochronally annealed at temperatures between 600 and 850 °C. Optical, secondary and transmission electron microscopy found that a majority of as cold-rolled grains contain a large fraction of primary twin densities and a smaller fraction of secondary twins. Partially recrystallised microstructures comprise a mix of recrystallised grains and annealing twins as well as remanent deformed grains with heavy dislocation substructures and deformation twins. Both deformation and annealing twins follow the {1 1 1}〈1 1 2〉 relationship. All partially recrystallised samples exhibited four work hardening regions and a decreasing twinning onset stress with greater percentage softening. A modification to the Hollomon–Ludwigson scheme is suggested to empirically account for the effect of strain on microstructural refinement.

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Link to publisher version (DOI)

http://dx.doi.org/10.1016/j.msea.2011.01.052