累计拉拔变形量及退火温度对3003铝合金线材组织和性能的影响

Effect of accumulative drawing deformation and annealing temperature on microstructures and properties of 3003 aluminum alloy wires

通过多道次连续拉拔和改变退火温度,研究了多道次累计拉拔及退火温度对3003铝合金线材的微观组织和力学性能的影响.结果表明:在多道次连续拉拔过程中,3003铝合金线材的纤维状组织逐渐变细;随着变形量的不断增加,线材的强度和硬度不断增大,伸长率逐渐减小.选取冷变形量为75%的3003铝合金线材进行退火处理,结果表明:当退火温度为370℃时,线材的微观组织仍为纤维状组织,但其强度和硬度明显减小;当退火温度达到390℃时,线材开始发生再结晶;随着温度的不断上升,线材再结晶程度提高,强度和硬度逐渐减小;当退火温度达到430℃时,线材发生完全再结晶,抗拉强度和硬度降至最低;此后随着退火温度继续升高,线材的强度和硬度的变化趋于稳定.

Through continuous multi-pass drawing and changing annealing temperatures,the effects of multi-pass accumulative drawing and annealing temperatures on microstructures and mechanical properties of 3003 aluminum alloy wires were studied.The results show that the fibrous structures of 3003 aluminum alloy wires become fine gradually in the process of multi-pass continuous drawing.With the increase of deformation,the strength and hardness of 3003 aluminum alloy wires increase,and the elongation decreases.3003 aluminum alloy wires with 75%cold deformation were annealed,and the results show that the microstructure of 3003 aluminum alloy wires is still fibrous when the annealing temperature is 370℃,but the strength and hardness of the wires decrease obviously.The recrystallization started at 390℃and completed at 430℃,and the degree of recrystallization increases with the increase of temperature,leading to a significant decrease in the mechanical properties.After the temperature exceeds 430℃,the mechanical properties of the wires will change little if the annealing temperature is increased.