The Dynamic and Static recrystallization of Low-carbon Microalloyed Pipeline Steels

摘要

The dynamic recrystallization behavior of two low-carbon microalloyed pipeline steels was studied by means of single pass compression under Gleeble-3500 hot simulator. At same time, the static recrystallization and strain induced carbonitride precipitation were studied by means of two passes interrupted compression. The results show that the alloy additions have an effect on the dynamic recrystallization behavior, the dynamic recrystallization activation energy (Qdef) is 373 kJ/mol Nb-Ti Steel and 407 kJ/mol for Mo-Nb Steel, respectively. Furthermore, The Mo-Nb additions in steel can restrain static recrystallization because of stain-induced carbonitrites precipitation. The start time of stain-induced carbonitrites precipitation is delayed in Nb-Ti steel and/or in high reheating temperature.