Metallurgical and Materials Transactions A

, Volume 34, Issue 8, pp 1599–1609

Effect of deformation schedule on the microstructure and mechanical properties of a thermomechanically processed C-Mn-Si transformation-induced plasticity steel

Authors

  • I. B. Timokhina
    • School of Physics and Materials EngineeringMonash University
  • P. D. Hodgson
    • School of Engineering and TechnologyDeakin University
  • E. V. Pereloma
    • School of Physics and Materials EngineeringMonash University
Article

DOI: 10.1007/s11661-003-0305-8

Cite this article as:
Timokhina, I.B., Hodgson, P.D. & Pereloma, E.V. Metall and Mat Trans A (2003) 34: 1599. doi:10.1007/s11661-003-0305-8

Abstract

Thermomechanical processing simulations were performed using a hot-torsion machine, in order to develop a comprehensive understanding of the effect of severe deformation in the recrystallized and nonrecrystallized austenite regions on the microstructural evolution and mechanical properties of the 0.2 wt pct C-1.55 wt pct Mn-1.5 wt pct Si transformation-induced plasticity (TRIP) steel. The deformation schedule affected all constituents (polygonal ferrite, bainite in different morphologies, retained austenite, and martensite) of the multiphased TRIP steel microstructure. The complex relationships between the volume fraction of the retained austenite, the morphology and distribution of all phases present in the microstructure, and the mechanical properties of TRIP steel were revealed. The bainite morphology had a more pronounced effect on the mechanical behavior than the refinement of the microstructure. The improvement of the mechanical properties of TRIP steel was achieved by variation of the volume fraction of the retained austenite rather than the overall refinement of the microstructure.

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© ASM International & TMS-The Minerals, Metals and Materials Society 2003