【摘要】 目的解决连铸连轧无氧铜管坯成分与组织控制问题。方法通过稀土净化除杂与微合金化作用,对无氧铜熔铸成分控制、水平连铸和行星轧制工艺开展深入研究。结果稀土添加后铸坯中P的质量分数由添加前0.009 5%降低至0.001 45%～0.001 82%,降低了80.8%;O的质量分数由0.004 5%降低至0.001 3%～0.001 83%,降低了59.3%;铸坯晶粒尺寸由稀土添加前的2200μm细化到到650μm,细化了70.4%;三辊行星组织轴向平均晶粒为16μm,周向平均晶粒为21μm。结论稀土微合金化能够有效控制热管用无氧铜铸坯的成分;稀土微合金化明显细化了铸坯的晶粒组织,使无氧铜轧制变形组织更加均匀。更多还原

【Abstract】 The work aims to solve the problems on controlling composition and microstructure of oxygen-free copper tubes by continuous casting and rolling. The controlling of cast composition, horizontal continuous casting and planetary rolling process of oxygen-free copper tube were studied in-depth by purification and microalloying with rare earth. The results showed that the mass fraction of P and O in the casting blank added with rare earth was reduced from 0.0095% to 0.001 45%-0.001 82% by 80.8% and from 0.004 5% to 0.001 3%-0.001 83% by 59.3% respectively. Moreover, the grain size of cashing blank added with rare earth was refined from 2200 μm to 650 μm by 70.4%. The axial average grain size of the three-roller planetary structure was 16 μm and the circumferential average grain size was 21 μm. The microalloying with rare earth can effectively control the composition of the oxygen-free copper for heat pipe. It apparently refines the grain size structure and makes the deformation microstructure of oxygen-free copper rolling more uniform.更多还原