一、前言在塑性加工中,冷锻件在表面状态和尺寸精度等许多方面比热锻件具有较多的优越性,因此今后用冷锻件取代一部分热锻件是势所必然的,但是材料冷态时的塑性往往比热态时差,因此对材料在室温下的冷锻成形性研究具有重要的价值。圆柱体镦粗实验能够简便而有效地反映材料的冷镦成 I. Preface In plastic processing, cold forgings have many advantages over hot forgings in many aspects, such as surface condition and dimensional accuracy, so it is inevitable to replace some of the hot forgings with cold forgings in the future. However, The plasticity tends to be worse than the hot state, so it is of great value to the cold forging formability of materials at room temperature. Cylinder upsetting experiments can easily and effectively reflect the material cold heading into