Improvement of mechanical properties in a forging microalloyed steel throughout the control of the anisothermal decomposition of austenite into acicular ferrite

The aim of this work is to study the anisothermal decomposition of austenit e at two different austenisation conditions in a medium carbon microalloyed steel. Ln this sense, continuous cooling transformation diagrams (CCT) hav e bo:cn obtained for both austenisation conditions to determine the continu ous cooling that allows the formation of a microstructure mainly formed of acicular ferrite with the best mechanical properties. The knowledge of the anisothermal decomposition of austenite in this steel has allowed to propos e continuous cooling cycles for industrial aplication. That produce high vo lume fraction of acicular ferrite.