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累积叠轧变形金属的界面焊合质量是影响叠轧工艺及材料成形性能的关键因素。利用累积叠轧技术研究了道次变形量对界面焊合强度的影响,比较了单道次下焊合坯料不同变形区域的组织特征,分析了界面焊合特征及焊合条件。结果表明:经300℃加热、50%压下量后的叠轧组织虽明显细化,但沿轧制方向分布极不均匀。道次变形量是影响界面焊合质量的一个基本因素,界面焊合质量随着道次变形量的增大而提高,当道次变形程度大于临界变形程度(50%)时,可以促进界面焊合,保证界面焊合质量:界面焊合较好区域已被再结晶覆盖,无明显界面层存在;抗拉强度和结合强度也随变形量增加而增大。
The quality of interfacial welding of stack-rolled deformable metal is the key factor that affects the rolling process and the formability of the material. The effect of the amount of deformation of the pass on the welding strength of the interface was studied by using the cumulative roll-over technique. The microstructures of the welded joints under single pass were compared. The welding characteristics and welding conditions were also analyzed. The results show that the microstructures of the rolled slabs after 50% reduction at 300 ℃ are obviously refined, but the distribution of the rolled slabs is very uneven along the rolling direction. The amount of deformation is one of the basic factors that affect the welding quality of the interface. The welding quality of the interface increases with the increase of the deformation of the pass. When the degree of deformation is greater than the critical deformation (50%), the interface welding , To ensure the quality of the interface welding: better interface welding area has been recrystallized coverage, there is no obvious interface layer; tensile strength and bond strength increases with the increase of deformation.