Ultra-fine ferrite grains obtained in the TSDR process

Ling Zhang1),Wangyue Yang1),Chunxia Xue2),and Zuqing Sun2) 1) School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China 2) The State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing 100083,China

摘 要：By careful design of rolling schedule,ultra-fine （～2μm） ferrite grains in a low carbon high niobium （0.09wt%Nb） micro-alloying steel with average austenite grain sizes above 800 μm can be achieved in the simulated thin slab direct rolling process. The 5-pass deformation was divided into two stages: the refinement of austenite through complete recrystallization and the refinement of ferrite through dynamic strain-induced transformation. The effects of Nb in solution and strain-induced NbCN precipitates on the ferrite transformation were also extensively discussed.

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