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本文研究Nb对热轧含Nb低碳钢的Y晶粒再结晶的抑制作用以及对a晶粒细化的影响关系.主要结论为:①抑制轧后Y晶粒再结晶的主要因素是由于受到热变形微细析出到Y基体中去的Nb(C,N)量,即与钢中含有可能形成Nb(C,N)的那部分Nb量有关,而与钢中添加的全部Nb量无直接关系.②钢的含C量对钢在冷却、变形、变形后的Nb(C,N)析出速度没有影响,而随着钢中含Nb量的增加其Nb(C,N)析出速度有所增加.③钢中析出的Nb(C,N)量增加,变形时Y晶粒再结晶的临界压下率也增加,这个影响当变形后的Y晶粒处于部分再结晶状态时比处于完全再结晶状态时要显著得多.④当轧后Y晶粒处于未再结晶状态时,相变后的a晶粒平均晶粒尺寸依赖于有效Y晶界面积的大小.
In this paper, the inhibitory effect of Nb on the recrystallization of Y grains and the effect on the grain refinement of a hot-rolled Nb-containing low-carbon steel were studied.The main conclusions are as follows: (1) The main factors that inhibit the recrystallization of Y grain after rolling are due to The amount of Nb (C, N) precipitated in the Y matrix by thermal deformation is related to the amount of Nb contained in the steel that may form Nb (C, N) but not to the total amount of Nb added in the steel .②The content of C in steel had no influence on the precipitation rate of Nb (C, N) after cooling, deformation and deformation, but the precipitation rate of Nb (C, N) increased with the increase of Nb in steel .③ The amount of Nb (C, N) precipitated in the steel increases and the critical reduction rate of recrystallization of Y grain also increases during the deformation. The effect is that when the deformed Y grain is in partially recrystallized state, The state is much more.④When the rolling Y grains are not recrystallized state, the average grain size of a phase after transformation depends on the size of the effective Y grain boundary area.