Influence of Ferrite Rolling Temperature on Grain Size and Texture in Annealed Low C and IF Steels
Influence of Ferrite Rolling Temperature on Grain Size and Texture in Annealed Low C and IF Steels
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DOI：
10.2355/isijinternational.37.706
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发表时间：
1997-07
影响因子：
1.8
通讯作者：
M. Barnett;J. Jonas
中科院分区：
文献类型：
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作者：
M. Barnett;J. Jonas
在环境温度和700°C之间的温度下对两种低碳钢和IF等级进行单道次轧制实验。然后进行盐浴退火处理。主要目的是研究从冷轧到温轧的过渡对退火行为的影响。退火的三个方面进行了研究：再结晶的动力学;最终晶粒尺寸;和由此产生的织构。低C等级中这些对变形温度的敏感性明显大于IF等级。在低C材料中，将轧制温度从冷到热改变导致达到50%再结晶的时间增加约1 1/2个数量级，最终晶粒尺寸增加两倍，并且织构显著不同（即由部分RD纤维而不是典型的ND纤维组成的织构）。相比之下，IF钢的再结晶仅受变形温度的轻微影响。这些观察结果解释的成核的影响方面的存储能量和晶粒内的带状的程度。特别是，目前的结果表明，晶内剪切带在ND纤维颗粒的形成中发挥的作用比以前认为的更大。从工业的角度来看，IF钢显然比低C级钢更容易用温轧材料代替冷轧材料。
Single pass rolling experiments were carried out on two low carbon steels and an IF grade at temperatures between ambient and 700°C. These were followed by salt bath annealing treatments. The main aim was to investigate the effect of the transition from cold to warm rolling on annealing behavior. Three aspects of annealing were examined: the kinetics of recrystallization; the final grain size; and the resulting texture. The sensitivity of these to the deformation temperature was markedly greater in the low C grades than in the IF grade. In the low C material, changing the rolling temperature from cold to warm resulted in an increase in time to 50% recrystallization of about 1 1/2 orders of magnitude, a two-fold increase in final grain size and a remarkably different texture (i.e. one composed of a partial RD fibre instead of the typical ND fibre). By comparison, recrystallization was only slightly influenced by deformation temperature in the IF steel. These observations are explained in terms of the influence on nucleation of the stored energy and the degree of in-grain banding. In particular, the present results suggest that in-grain shear bands play a larger role in the formation of ND fibre grains than previously thought. From an industrial standpoint, IF steels clearly lend themselves more readily to the replacement of cold by warm rolled material than do low C grades.