Metallurgical Modeling of Recrystallization of Cold Rolled Nb-Ti Steel Strip

M. A. VICENTE ALVAREZ; T. PEREZ; F. ACTIS

Pittsburgh USA

Conferencia; International Conference On Microalloyed Steels: Processing, Microstructure, Properties and Performance; 2007

AIST, Pittsburgh University

<!-- /* Style Definitions */ p.MsoNormal, li.MsoNormal, div.MsoNormal {mso-style-parent:""; margin:0cm; margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-fareast-font-family:"Times New Roman"; mso-ansi-language:ES-AR;} @page Section1 {size:612.0pt 792.0pt; margin:70.85pt 3.0cm 70.85pt 3.0cm; mso-header-margin:36.0pt; mso-footer-margin:36.0pt; mso-paper-source:0;} div.Section1 {page:Section1;} --> Cold rolled steel strips are annealed either in batch or continuous furnaces to obtain the required mechanical properties. During this process, several metallurgical phenomena occur, including recovery, recrystallization, grain growth, and precipitation of elements in solid solution. The mechanical properties of the material after annealing depend on the final microstructure (specially grain size) and state of precipitates. In this work a metallurgical model whose output are the recrystallization fraction, the state of precipitates, the grain size and the mechanical properties (yield strength and tensile strength).is presented. The parameters of the model were fitted with experimental results obtained during laboratory simulation on Nb-Ti low carbon steel. Finally, continuous and batch annealing cycles were simulated in a laboratory furnace. On the annealed probes mechanical properties were determined and compared with the model predictions.