Deformation-Induced Austenite-to-Ferrite Massive Transformation in Medium Carbon Steel

Autor: Soon Young Ok, Kwan Ho Kim, Joong Keun Park, Jun Ho Chung
Rok vydání: 2008
Předmět:
Zdroj: Metallurgical and Materials Transactions A. 39:235-242
ISSN: 1543-1940
1073-5623
DOI: 10.1007/s11661-007-9404-2
Popis: Austenite-to-ferrite transformation behavior during hot deformation within the two-phase field was studied in a medium carbon (0.25 wt pct) steel containing 1.1 wt pct Mn-0.25 wt pct Si. Flow softening was observed during hot deformation at temperatures lower than a critical temperature within a two-phase field under the slow strain rate condition. This was because the austenite-to-ferrite transformation during deformation occurred by the deformation-induced massive transformation. The critical temperature was observed to be significantly higher than the T0 temperature, suggesting that the γ-α equilibrium temperature was largely shifted toward higher temperature during hot deformation. The T0 shift was believed to be possible because a nonuniform deformation-induced stress can develop between austenite and ferrite phases during hot deformation due to the presence of a significant yield stress difference between two phases.
Databáze: OpenAIRE
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