基于锻轧成形工艺的KFC异型铜带组织性能研究

Study on Structure and Performance of KFC Special-shaped Copper Strip Based on Forging and Rolling Composite Forming Technology

研究了KFC热轧合金带坯在锻轧工艺制备异型铜带过程中,通过冷锻、在线退火和轧制等工艺处理后内部组织的演变规律,并采用金相显微镜、电导率测试仪、维氏硬度仪及拉伸试验等检测了产品的综合性能指标。结果表明,带坯在冷锻加工率为69.45%时,带材薄料区域处晶粒不断细化,内部产生大量位错带,加工硬化作用显著,带材的强度、硬度增大。对锻轧材料进行固溶退火处理后,晶粒不断加粗,且部分FeCu_(4)固溶物质转变为Fe相的Cu相。经过锻轧复合加工,材料的总形变量为74.79%,其抗拉强度和硬度由热轧态的289 MPa和65.3HV提升至336 MPa和112HV,电导率由85.12%IACS提升至89.23%,折弯次数在5次以上,展现出优异的综合性能。

The evolution of the internal structure of hot-rolled flat strip billet after cold forging,online annealing and rolling in the process of preparing special-shaped copper strip by forging and rolling was studied,and the comprehensive performance of the product was tested by metallographic microscope,conductivity tester,vickers hardness tester and tensile test.The results show that when the cold forging processing rate of the strip billet is 69.45%,the grain at the thin strip area is continuously refined,and a large number of dislocation belts are generated inside,the work hardening effect is significant,and the strength and hardness of the strip increase sharply.After solution annealing of the forged material,the grain continues to increase,and part of the FeCu_(4) solid solution material is transformed into Fe phase and cuphase.After forging and rolling composite processing,the total shape variable of the material is 74.79%,its tensile strength and hardness are increased from 289 MPa and 65.3HV in hot-rolled state to 336 MPa and 112HV,the conductivity is increased from 85.12%IACS to 89.23%,and the number of bending times is more than 5,showing excellent comprehensive performance.