铜包钢线加工工艺对其力学性能的影响

Research on Influences of Processing Technology on Mechanical Property of Copper Clad Steel Wire

采用包覆焊接法制备铜包钢线,并对其进行拉拔变形及退火处理,研究了拉拔变形量和退火处理对其拉伸强度和伸长率的影响;分析了其拉伸强度和伸长率随加工工艺的变化规律。结果表明,铜包钢线的抗拉强度随其变形量的增加而升高,伸长率则降低。根据原始纯铜和钢丝的抗拉强度值,应用复合材料强度的混合法则,可计算不同拉拔变形的铜包钢线抗拉强度。经实验验证,与实测值结果接近。随铜包钢线退火时间的延长和退火温度的升高,其抗拉强度降低,伸长率升高。当其退火温度升高至850℃,退火时间延长为2 h时,其抗拉强度和伸长率几乎不变。根据Hollomon关系式,通过实验计算得到拉拔变形量为50%的铜包钢线的应变硬化指数n=0.4。

The copper clad steel （CCS） wire was preparated by the method of cladding and welding and then drawed and annealed. The effects of drawing deformation, annealing temperature and annealing time on the tensile strength and elongation were studied. The pattem of tensile strength and elongation change with processing technic was analy^ed. The results show that the tensile strength of CCS is increased with the increase of the drawing deformation, the elongation is decreased oppositely. According to the tensile strength of primitive pure copper and steel wire, applying the mixed rules of composite material strength, can calculate the tensile strength of the copper clad steel wire with different drawing the deformation. Through the results of experiment, it is closed to the measured results. The tensile strength of CCS decreases with the increase of the anealing temperature and time, the elongation increased oppositely. When the annealing temperature is 850 ℃, annealing time is 2 h, its tensile strength and elongation are invariabe. According to the relationship of Hollomon, through the certification of experiment, the strain hardening exponent of the wire under drawing deformation of 50% is 0.4.