铌钒钛与含钛高强钢的高温变形行为

在Gleeble 2000热模拟实验机及D450实验轧机上进行不同参数的单道次压缩及多道次淬火实验.研究表明,对铌钒钛高强钢,微合金元素铌、钒、钛的碳氮化物能有效抑制奥氏体的高温软化行为,经过6道次变形的奥氏体晶粒细化到8μm左右,其控轧工艺为未再结晶区的控制轧制.对含钛高强钢,微合金元素钛表现出相对较弱的抑制奥氏体再结晶效果,经过6道次变形后的奥氏体晶粒细化到11μm左右,其控轧工艺为再结晶区控制轧制.

High-Temperature Deformation Behavior of Nb/V/Ti-Bearing and Ti-Bearing HSLA Rolled Steels

The high-temperature deformation behavior of both Nb/V/Ti-bearing and Ti-bearing HSLA rolled steels was investigated, with the single-pass reduction conducted on the Gleeble 2000 thermomechanical simulator and multi-pass quenching on a D450 experimental rolling stand. The results showed that the softening is restricted by the carbonitrides of microalloying elements Nb, V and Ti in the HSLA steel and, after 6-pass reduction, the austenite grain size is down to 8 μm through grain refining, i.e., the controlled rolling process is not implemented in the recrystallization zone. However, the recrystallization effect by single Ti element is weaker in the HSLA-Ti steel where the austenite grain size is down to about 11 μm after 6-pass reduction, i.e., the controlled rolling process is in the recrystallization zone.