高铌钛铝基合金板材的高温包套轧制

High Temperature Pack Rolling of A High-Nb TiAl Alloy Sheet

摘要:

采用高温包套轧制方法在普通轧钢轧机上首次成功的轧制出厚度为2．6mm的高铌钛铝基合金板材。合金在轧制中的总变形量达到70％。板材表面质量良好，显微组织观察表明合金在轧制中发生了再结晶，但是变形后的组织并没有由于再结晶而明显细化。这主要是由于合金在轧制回炉保温和轧后随炉冷却过程中，长时间停留在高温区间，导致了合金晶粒的长大。

Abstract:

By high temperature pack rolling, the first high-Nb TiAl sheet with the thickness of 2.6 mm has been successfully fabricated on a conventional rolling mill. The overall rolling reduction is about 70%, and the surface condition of the sheet is very good. Microstructure observation indicates that during the high temperature rolling, dynamic recrystallization takes place. But the microstructure is not significantly refined by this recrystallization probably on account of the grain growth that occurs during reheating between rolling passes and final furnaccooling.