Details

Autor(en) / Beteiligte

• Somani, Mahesh Chandra
• Porter, David A.
• Hamada, Atef S.
• Karjalainen, L. Pentti

Titel

High-Temperature Flow Stress and Recrystallization Characteristics of Al-Bearing Microalloyed TWIP Steels

Ist Teil von

• Metallurgical and materials transactions. A, Physical metallurgy and materials science, 2015-11, Vol.46 (11), p.5329-5342

Ort / Verlag

New York: Springer US

Erscheinungsjahr

2015

Quelle

Springer Nature - Complete Springer Journals

Beschreibungen/Notizen

• In this study, the effects of microalloying (Nb,V) and aluminum on the constitutive flow behavior and static recrystallization (SRX) characteristics of microalloyed TWIP steels (Fe-20Mn-0.6C-Al-(Nb,V)) have been investigated under hot deformation conditions. Compression tests in a Gleeble simulator, including the double-hit technique, enabled the acquisition of flow stress and recrystallization data. These were analyzed to determine the powers of strain and strain rate as well as the activation energies of deformation and recrystallization ( Q def and Q rex ). Aluminum increased the flow stress and activation energy of deformation and delayed the onset of dynamic recrystallization of microalloyed TWIP steels. While microalloying with V up to 0.3 pct seems to have little or no effect on the SRX kinetics, microalloying with 0.026 pct Nb significantly slowed down the SRX rate, similarly as in the case of low C-Mn steels. Addition of high aluminum (4.9 pct) marginally retarded the SRX kinetics in comparison with the steels with low aluminum (1.5 pct), with or without microalloying with V.