Effect of intermediate annealing on the microstructure and texture of cold rolled pure titanium plates
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摘要: 采用电子背散射衍射(EBSD)等测试手段和分析方法，系统地研究了不同退火温度对冷轧纯钛板微观组织及织构的影响。结果表明：中间退火温度为700 ℃时，0.6 mm冷轧至0.25 mm后经700 ℃/1 h退火得到的再结晶组织更加均匀，残余应力更小，{0001}、{10-10}及{11-20}三个极图上的织构更加散漫，织构强度整体较弱，取向分布更加随机。Abstract: A comparative and systematic study was conducted on the effects of annealing temperatures on the microstructure and texture of cold-rolled pure titanium plates using testing methods and analysis methods such as Electron Backscatter Diffraction (EBSD). The results show that when the intermediate annealing temperature is 700 ℃, the recrystallized structure of 0.25 mm plate obtained by cold rolling from 0.6 mm plate and 700 ℃/h treatment is more uniform with smaller residual stress. The textures on the {0001}, {10-10}and {11-20} three pole figures are more scattered with weaker overall texture intensity, and the orientation distribution is more random.
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Key words:
- cold rolled pure titanium plate /
- intermediate annealing /
- recrystallization /
- texture
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图 1 不同退火温度条件下的IPF图
(a) 冷轧态； (b)650 ℃/1 h； (c)700 ℃/1 h；(d)750 ℃/1 h
Figure 1. IPF diagrams of specimens at different annealing temperatures
图 2 不同中间退火温度条件下的BC图和晶粒尺寸分布
(a)(e) 冷轧态；(b)(f) 650 ℃/1 h；(c)(g) 700 ℃/1 h；(d)(h) 750 ℃/1 h
Figure 2. BC and grain size distribution diagrams of specimens at differentintermediate annealing temperatures
图 3 不同中间退火温度条件下的KAM图
(a) 冷轧态；(b)650 ℃/1 h；(c)700 ℃/1 h；(d)750 ℃/1 h
Figure 3. KAM diagrams of specimens at different intermediate annealing temperatures
图 4 不同中间退火温度条件下的取向差角
(a)冷轧态；(b)650 ℃/1 h；(c)700 ℃/1 h；(d)750 ℃/1 h
Figure 4. Misorientation angle distribution of specimens at different intermediate annealing temperatures
图 5 不同中间温度退火钛板经0.6 mm→0.25 mm冷轧后对应的IPF图及BC图
Figure 5. IPF and BC diagrams of titanium plates annealed at different intermediate temperatures after cold rolling from 0.6 mm to 0.25 mm
(a)(d)650 ℃；(b)(e)700 ℃；(c)(f)750 ℃
图 6 不同中间温度退火钛板经0.6 mm→0.25 mm冷轧后700 ℃/1 h退火对应的IPF图及BC图
Figure 6. IPF and BC diagrams of titanium plates annealed at different intermediate temperatures after cold rolling from 0.6 mm to 0.25 mm and annealing at 700 ℃ for 1 h
(a)(d)650 ℃；(b)(e)700 ℃；(c)(f)750 ℃
图 7 不同中间温度退火钛板经0.6 mm→0.25 mm冷轧后经700 ℃/1 h退火前后对应的晶粒大小分布
Figure 7. Grain size distribution of titanium plates annealed at different intermediate temperatures before and after cold rolling from 0.6 mm to 0.25 mm and annealing at 700 ℃ for 1 h
(a)(d)650 ℃；(b)(e)700 ℃；(c)(f)750 ℃
图 8 不同中间温度退火钛板经0.6 mm→0.25 mm冷轧后经700 ℃/1 h退火前后对应的取向差角分布
Figure 8. Misorientation angle distribution of titanium plates annealed at different intermediate temperatures before and after cold rolling from 0.6 mm to 0.25 mm and annealing at 700 ℃ for 1 h
（a)(d)650 ℃；(b)(e)700 ℃；(c)(f)750 ℃
图 9 不同条件下的极图
(a)冷轧态；(b)650 ℃/1 h；(c)700 ℃/1 h；(d)750 ℃/1 h
Figure 9. Pole figures under different conditions
图 10 不同中间温度退火钛板经0.6 mm→0.25 mm冷轧后对应的极图
Figure 10. Pole figures of titanium plates annealed at different intermediate temperatures after being cold-rolled from 0.6 mm to 0.25 mm
(a)650 ℃；(b)700 ℃；(c)750 ℃
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