材料期刊网

本文叙述关于热叠轧薄板粘结的研究结果。比较全面和深入的研究说明,薄板粘结与许多因素有关,因此必须较全面地控制轨料、工具和加热情况以及轧制条件,才能较有效地减少粘结。 实验结果指出,温度为影响粘结的主要因素之一,粘结随温度升高而增加。粘结随压下率的增加亦有增加。轧制速度适当地提高可以减少粘结。辊面光洁度对粘结亦有一定的影响,经常保持辊面的光洁度可以减少粘结。薄板轨后的冷却速度和方式,对粘结也有很大影响,故板堆不宜过高,且应使之加速冷却。 氧化铁皮亦为影响粘结的主要因素之一,毫无氧化铁皮的表面可以在轧制过程中结为牢固的整体。加热和轧制均能改变薄板内磷的分布’而使薄板表面层的磷含量增加,因此少量的磷对减少粘结可以起显著的作用。 粘结区的显微结构表现有五种不同的特征,足以说明造成粘结的多种原因。

Results of a comprehensive investigation on the sticking of thin steel sheetsduring pack rolling reveal that it is a very complicated problem, so that it is neces-sary to have a good control of the conditions of the materials under working aswell as the heating, tool surface and rolling conditions before sticking can be effec-tively reduced. Experimental results also point out that rolling temperature is one of the mainfactors affecting sticking, since sticking increases with the rise in rolling temperature.Increase in reduction also increases sticking; while a rise in rolling speed reducesit. The way in which rolled sheets are cooled has also considerable influence onsticking, so that it is best to cool the sheets down rapidly and it is undesirable topile up too many sheets together during cooling. The oxide film on the surface of sheets is also an importan factor affectingsticking. When there is no oxide film on the surface, the sheets stick togetherfirmly as a solid whole during pack rolling. Both heating and rolling change thedistribution of phosphorus in the sheet with a tendency to increase the phosphoruscontent on the surface, thus reducing the degree of sticking. The microstructure of the stuck surface has been examined and has been foundto show five different forms revealing the complicated nature of sticking.