普通C-Mn钢超细晶中厚板的带状组织

采用Gleeble2000热模拟试验机研究了普通C-Mn钢的再结晶规律，在实验室轧机上进行了C-Mn钢超细晶中板的轧制，并且在首钢中厚板厂工业轧机上进行了超细晶中厚板的工业试制，研究了工艺条件对中厚板带状组织的影响，分析了带状组织产生的机理。研究结果表明，在靠近静态相变温度Ar3附近的未再结晶区进行大变形量轧制(形变诱导相变)，不仅可以使板材的铁素体晶粒细化甚至获得超细晶组织，而且普通C-Mn钢中厚板中的带状组织减轻1～2级；降低精轧开轧温度有利于减轻板材的带状组织；在未再结晶区控轧有利于减轻板材的带状组织；随着未再结晶区形变量增加，板材的带状组织减弱。

Banding Pearlite of Plain C-Mn Steel Plates with Ultra-fine Grained Ferrite

e recrystallization regularities of plain C-Mn steel have been studied with the Gleeble 2000 hot simulation tester. The plain C-Mn steel plates with ultra-fine grained ferrite have been fabricated in laboratory. Furthermore, the plain C-Mn steel plates with ultra-fine grained ferrite have also been manufactured in the Shougang Steel Plate Rolling Plant. The effects of the process factors on the banding pearlite and the mechanism were analyzed to decrease and eradicate the banding pearlite. The results show that:severe deformation amount in the non-recrystallization zone near the static transformation temperature, Ar3, can not only make ferrite grains fine even ultra-fine in the C-Mn steel plates, but also decrease the banding pearlite 1-2 grade; with the decrease of finish rolling initial temperature, the banding pearlite can be decreased; controlled rolling in the non-recrystallization zone is beneficial to decrease banding pearlite and with the increase of deformation amount in the zone, the banding pearlite further decrease.