合金含量对热变形奥氏体组织演变的影响

Influence of Alloying Content on Microstructure Evolution of Hot Deformed Austenite

建立了低合金和微合金钢奥氏体再结晶动力学模型,并采用单道次和双道次压缩实验来验证Si-Mn钢和Nb-V钢模型中的参数,实验结果证明了模型的准确性.将该模型应用于宝钢2050热轧生产线来预测奥氏体晶粒尺寸在热轧过程中的变化,以及每一道次流变应力.结果表明,添加低合金和微合金元素都能抑制再结晶的发生和晶粒长大,使流变应力增高.

The models of recrystallization kinetics are developed for the austenites in low alloy and microalloyed steel. Their exactness have been well tested by use of single/double pass compression to verify the parameters in the models for hot deformed Si-Mn steel and Nb-V steel. The models were applied to the 2050 hot roiling line in Baosteel to predict the evolution of austenite grain size and rheologicaI stress at each pass during hot roiling, and the results showed that the addition of either low alloyed elements or microalloyed elements both retards dynamic/static reerystallization and austenite grain growth, thus increasing the rheologicaI stress of austenite.