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对含有Ti,Nb,Ti—Nb的三种无间隙原子钢(IF钢),利用多道次扭转试验,研究了它们总的精轧变形量(从2.1～3.2)和精轧开轧温度(从990～930℃)的影响。这些试验的应变速率为2s~-1。在精轧中,静态再结晶是造成早期轧制阶段轧制间隙期间高度软化的原因。在后来的轧制阶段,动态再结晶的出现取决于钢的化学成分、精轧总变形量和精轧温度。lF钢的临界温度是模拟粗轧工艺确定的。以相同的轧制工艺为条件.Nb固定钢晶粒最细,反之,Ti固定钢铁素体晶拉最大。由于精轧的间隙时间(1～2s)比粗轧的间隙时间要短得多,所以精轧时IF钢呈现出高的未再结晶温度。
The three kinds of interstitial-free atomic steel (IF steel) containing Ti, Nb and Ti-Nb were studied by multi-pass torsional tests and their total finish rolling deformation (from 2.1 to 3.2) and finishing rolling temperature From 990 to 930 ° C). The strain rate of these tests is 2s ~ -1. In finish rolling, static recrystallization is responsible for the high degree of softening during the rolling gap in the early rolling stages. In subsequent rolling stages, the appearance of dynamic recrystallization depends on the chemical composition of the steel, the total amount of deformation in the finish rolling, and the finish rolling temperature. lF steel critical temperature is simulated roughing process to determine. In the same conditions for the rolling process.Nb fixed steel grain finest, on the contrary, Ti fixed steel ferrite crystal pull the largest. As the finishing time (1 ~ 2s) is much shorter than the roughing gap time, the IF steel shows a high non-recrystallization temperature during finish rolling.