Effect of annealing temperature on microstructure and properties of Ti-0.3Mo-0.8Ni titanium alloy sheet
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摘要: 研究了6 mm厚Ti-0.3Mo-0.8Ni钛合金板材不同退火温度对组织和力学性能的影响。结果表明，600～700 ℃时α相主要发生回复再结晶过程，同时沿晶界形成链状Ti2Ni颗粒，屈服强度、抗拉强度逐渐降低，延伸率先增加后减少，650 ℃时，延伸率达到最大值22.5%，随着颗粒物的增加显著降低其力学性能；750～850 ℃时α相由部分再结晶组织转变为完全再结晶组织，β转变组织由条状转变为块状，屈服强度、抗拉强度、断后伸长率均逐渐降低，850 ℃时大幅下降至最低值，远低于标准要求；适用于6 mm厚Ti-0.3Mo-0.8Ni钛合金板材退火温度范围是600～650 ℃。
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关键词:
- Ti-0.3Mo-0.8Ni /
- 退火温度 /
- Ti2Ni /
- β转变 /
- 延伸率
Abstract: The effect of annealing temperature on microstructure and properties of 6 mm Ti-0.3Mo-0.8Ni titanium sheet was studied. The results show that at 600～700 ℃, the recrystallization of α phase occurs and chain-like Ti2Ni particles are formed along the grain boundary, accompanying a decrease in the yield strength and tensile strength, with the elongation increasing first and then decreasing. A maximum 22.5% of the elongation can be obtained at 650 ℃, and the mechanical properties decrease significantly with the increase in amount of the particles. At 750～850 ℃, α phase transforms from partial recrystallization structure to complete recrystallization structure, and the β phase changes from long strip to block structure, with the yield strength, tensile strength and elongation after fracture decreased gradually. And the worst mechanical properties far below the standard are obtained at 850 ℃. The annealing temperature suitable for 6 mm Ti-0.3Mo-0.8Ni titanium sheet was determined at 600～650 ℃.-
Key words:
- Ti-0.3Mo-0.8Ni /
- annealing temperature /
- Ti2Ni /
- β transformation /
- elongation
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图 2 不同温度退火后显微组织
Figure 2. Microstructure of samples at different annealing temperatures
(a) 600 ℃; (b) 650 ℃; (c) 700 ℃; (d) 750 ℃; (e) 800 ℃; (f) 850 ℃
表 1 能谱分析结果
Table 1. Chemical compositions of the selected positions in Fig. 3
% 退火温度/℃ 位置 Ti Ni Mo Fe 700 基体 99.30 0.29 0.41 0 白色颗粒 77.53 21.76 0.71 0.5 850 基体 99.67 0.19 0.14 0 β转变组织 97.08 2.07 0.75 0.1 
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表 2 试样显微硬度结果
Table 2. Hardness of the samples
试样温度/℃ 硬度(HV0.5) β转变组织硬度（HV0.01） 600 160 650 157 700 153 750 160 800 161 207 850 142 217
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表 3 力学性能结果
Table 3. The mechanical properties of the samples
退火温度/℃ Rp0.2/MPa Rm/MPa A/% 600 512.0 547.1 18.0 650 438.2 500.1 22.5 700 379.1 490.0 17.5 750 412.8 499.3 21.0 800 398.9 495.2 17.5 850 229.6 388.8 12.0
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