Effect of processing technology on the properties of pure titanium coil for high-quality anode sheets
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摘要: 以低氧、低氢OA级海绵钛为原料，采用EB+VAR双联熔炼工艺制备铸锭，通过不同工艺路径轧制获得阳极板用纯钛卷带。利用表检仪、金相显微镜及万能力学试验机对卷带的表面质量、显微组织和力学性能进行系统表征。结果表明，通过调整工艺路径可有效调控卷带的表面状态与力学性能。当采用两轧程工艺并结合560 ℃，(10+8) h的罩式退火处理时，所得钛卷带表面质量良好，力学性能优异，晶粒度达到9级以上，满足钛阳极用卷带的技术要求。Abstract: This study utilized low-oxygen, low-hydrogen OA-grade sponge titanium as the raw material. The ingot was prepared via the EB + VAR dual melting process, and pure titanium coils for anode sheets were obtained through different processing routes. The surface quality, microstructure, and mechanical properties of the coils were systematically characterized using a surface inspection system, optical microscope, and universal mechanical testing machine. The results indicate that adjusting the processing route can effectively control the surface condition and mechanical properties of the coils. When employing a two rolling procedure combined with bell annealing at 560 °C × (10+8) h, the resulting titanium coils exhibited good surface quality and excellent mechanical properties, with a grain size rating reaching Grade 9 or higher, meeting the technical requirements for titanium anode coils.
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Key words:
- sponge titanium /
- anode sheets /
- titanium coil /
- grain size
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图 2 不同轧程工艺表检缺陷分布
（a）一轧程；（b）二轧程
Figure 2. Surface defect maps for different rolling procedures
图 3 不同轧程的钛卷带在相同退火工艺下的金相组织
（a）一轧程卷头部；（b）一轧程卷尾部；（c）二轧程卷头部；（d）二轧程卷尾部
Figure 3. Microstructure of titanium coils from different rolling procedures under the same annealing process
图 4 不同轧程的钛带在相同退火工艺下的力学性能
(a) 强度；(b) 延伸率
Figure 4. Mechanical properties of titanium strips from different rolling procedures under the same annealing process
图 5 相同轧程的钛带在不同退火工艺下的力学性能
(a)强度；(b) 延伸率
Figure 5. Mechanical properties of titanium strips from the same rolling procedure under different annealing processes
图 6 相同轧程的钛带在不同退火工艺下的金相组织
560 ℃:（a）头部,（b）尾部；580 ℃:（c）头部,（d）尾部；600 ℃:（e）头部,（f）尾部
Figure 6. Microstructure of titanium strips from the same rolling procedure under different annealing processes
表 1 纯钛铸锭的化学成分
Table 1. Chemical compositions of pure titanium ingots
% Serial number O Fe C N H Nominal value ≤0.05 ≤0.03 ≤0.01 ≤0.01 ≤0.001 1# 0.035 0.016 0.007 0.003 0.0006 2# 0.042 0.019 0.006 0.004 0.0006 3# 0.038 0.017 0.007 0.004 0.0006 4# 0.037 0.016 0.006 0.003 0.0006 
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