Study on Microstructure Evaluation of hot rolled C-Mn-Si-Al TRIP steel based on dynamic transformation of undercooled austentie
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北京科技大学
Cite this article:
. Study on Microstructure Evaluation of hot rolled C-Mn-Si-Al TRIP steel based on dynamic transformation of undercooled austentie. Acta Metall Sin, 2008, 44(6): 686-692 .
Abstract Abstract: The microstructure evolution of hot rolled C-Mn-Al-Si TRIP steel based on dynamic transformation of undercooled austenite was investigated by uniaxial hot compression tests on a Gleeble1500 simulation test machine. The results showed that the volume fraction of ferrite transformed during dynamic transformation of undercooled austenite was determined by applied strain，at the meantime, the formation of ferrite was significantly accelerated and the remained austenite was much dispersed. When the isothermal bainitic treatment was implemented after the dynamic transformation of undercooled austenite, the remained austenite which had relatively larger size transformed quickly to bainite with fine structure and chaotic orientation, the small austenite islands with grain size between 0.5～1.5µm located among ferrite had higher stability and rather difficult transformed to bainite. By dynamic transformation of undercooled austenite and the subsequent isothermal bainitic transformation, a desired microstructure of hot rolled TRIP Steel was obtained, which characterized by fine grain size of ferrite, high volume fraction of retained austenite and the uniform distribution of bainite and retained austenite.
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