铜包钢线材室温拉变形后的显微组织和力学性能

研究了经室温拉变形后的纯铜包覆Q195钢的不同线径的线材的显微组织及力学性能.结果表明,显微组织自原始的等轴晶变为细长条纤维状,纤维长度与形变量的平方近似地成正比,纤维直径与形变量近似地成反比.经室温拉变形的包覆线材的抗拉强度,随形变量增大而增大,与形变量平方根呈直线关系;但延伸率降低,延伸率波动偏高与晶界融合及Q195钢的渗碳体球化现象吻合.根据原始纯铜和Q195钢的抗拉强度值,可以用复合材料强度的混合法则来近似地预测不同线径的包覆线材的抗拉强度.

Microstructure and Mechanical Properties of Cladding Copper-steel Wire by Drawing at Room Temperature

The microstructure and mechanical properties of pure copper clad Q195 steel wires in different diameters by drawing at room temperature were studied in this paper. The results show that the microstructure of the cladding wire by drawing at room temperature is vimineous grain which was drawn from prime equiaxed grain. The fibril length is in direct proportion to square root of deformation and the fibril diameter is in inverse proportion to deformation approximately. The ultimate tensile strength of the cladding wire by drawing at room temperature goes up in direct proportion to square root of deformation, and the elongation comes down. A little increment of the elongation of the clad- ding wires is a coincidence of partial grain boundary amalgamation and sphericized cementite in Q195 steel. Based on the original values of the ultimate tensile strength of prime pure copper and Q195 steel, the ultimate tensile strength of the cladding wires in different diameters can he doped out by mix principle of composite material.