两相区热轧对低碳合金钢板组织性能的影响

Effect of hot rolling in dual-phase region on microstructue and mechanical properties of low-carbon alloy steel plate

为了提高低碳合金钢板的强度,进行了终轧温度为710℃的(α+γ)两相区和γ单相区的热轧对比试验。结果表明:与终轧温度为800℃奥氏体单相区轧制的钢板相比,采用终轧温度为710℃的两相区热轧工艺所得到的钢板强度并没有增加;而且,(α+γ)两相区轧制条件下所得到的多边形铁素体组织具有二个特征,一是呈现仿晶界型铁素体形貌,二是部分铁素体晶粒沿轧制方向被拉长,一定程度上出现织构现象,但不十分明显。

To increase the strength of low-carbon alloy steel, the hot rolling experiment in （α＋γ） dual-phase region with finish rolling temperature of 710℃, and the hot rolling experiment in γ single-phase region with finish rolling temperature of 800℃ were carried out. The results indicate that in comparison with that of the plate roiled in y region, no significant increase of strength of the steel plate roiled in （α＋γ） region is observed. Further more, the polygonal ferrite rolled in （α＋γ） region exhibits two characteristics： grain boundary allotriomorphic ferrite forms, some ferrite grains are stretched along roiling direction, and texture structure also appears to some extent but it is not very obvious.