Study and Modeling of Annealing Regimes in Bell Furnaces for Cold-Rolled High-Strength Microalloyed Steels

Resumo

A detailed study is performed on laboratory melted model high-strength steels microalloyed with niobium of features of the change in microstructure, mechanical properties, and excess phase precipitate formation in relation to hot rolling and bell furnace annealing parameters. It is established that an increase in annealing temperature and duration leads to a reduction in the level of mechanical properties and an increase in rolled product grain size. Annealing parameters are found providing optimum steel microstructure fineness for steels hardened during stamping. Proof is obtained for adequacy of the results of laboratory modeling for annealing, and good prospects are demonstrated for adaptation of the regimes developed to industrial conditions.