Effects of Al addition on tensile properties of partially recrystallized austenitic TRIP/TWIP steels

Min Chul Jo, Min Cheol Jo, Alireza Zargaran, Seok Su Sohn, Nack J. Kim, Sunghak Lee

Research output: Contribution to journalArticlepeer-review

Abstract

Austenitic high-Mn steels are regarded as a promising candidate for high-strength cold-rolled steels because their combination of strength and ductility improves greatly by combined effects of twinning-induced plasticity (TWIP) and transformation-induced plasticity (TRIP). Although it is well known that Al plays key roles in tensile properties of austenitic TWIP steels, its effects in austenitic TRIP or TRIP/TWIP steel are still unclear yet. In this study, three austenitic steels (composition; 0.4C–15Mn–1Si-(0,0.5,1)Al-0.3Mo-0.5V (wt.%)) were fabricated, and the effect of Al alloying on microstructures and tensile properties were investigated in relation to the deformation behavior with TRIP and TWIP mechanisms. A partial recrystallization was conducted for enhancing the yield strength, which was characterized with electron backscatter diffraction (EBSD) grain orientation spread maps. The present steels showed 1 GPa of yield strength achieved by partial recrystallization with the precipitation of (V + Mo) complex carbides. Particularly in the non-Al-alloyed steel, the ε-martensite formed in the early deformation stage, and the martensitic transformation continued until the failure, thereby resulting in the highest tensile strength (1.5 GPa) along with the highest strain hardening.

Original languageEnglish
Article number140823
JournalMaterials Science and Engineering A
Volume806
DOIs
Publication statusPublished - 2021 Mar 4

Keywords

  • High-Mn austenitic Steels
  • Partial recrystallization
  • Serrated flow
  • Transformation-induced plasticity (TRIP)
  • Twinning-induced plasticity (TWIP)

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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