Microstructure and properties of architectural TiAl alloy with heat treatment after welding
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摘要: 对建筑用TiAl合金电子束焊接接头进行了两种热处理试验研究,借助金相显微镜(OM)分析了接头不同区域的显微组织，并对焊接接头进行显微硬度测试，分析了两种热处理方式对建筑TiAl合金焊接接头组织及硬度带来的变化。研究表明，TiAl合金电子束焊接后焊缝组织主要为α2相，B相与O相。焊接接头局部热处理后接头硬度较高的区域有所增加，但整体呈下降趋势；热处理后，TiAl合金电子束焊接后合金焊缝区的B2相尺寸减小，但B2相分解的O相板条尺寸变大。整体热处理后焊接接头的显微硬度整体有所降低。两种热处理均能降低焊缝区显微硬度，并分布较为平稳。Abstract: In this paper, two kinds of heat treatment were carried out on the electron beam welded joints of architectural TiAl alloy. The microstructure of different areas of the joints was analyzed with metallographic microscope (OM), and the microhardness of the welded joints was tested. The influences of the heat treatment processes on the microstructure and hardness of the welded joints of the architectural TiAl alloy were analyzed. The results show that the weld structure of TiAl alloy is composed of α2 phase, B phase and O phase. The area with higher hardness of the joint increases, but the overall trend is down after the local heat treatment. After heat treatment, the B2 phase size of TiAl alloy reduces, while the O phase plate decomposed from B2 phase becomes large. The overall microhardness of the welded joint is reduced after integral heat treatment. The microhardness of the weld zone can be reduced by two heat treatment methods, and it presents a stable distribution.
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Key words:
- architectural TiAl alloy /
- electron beam welding /
- joints /
- heat treatment /
- microstructure /
- hardness
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图 3 TiAl合金电子束焊接接头显微组织
Figure 3. Microstructure of electron beam welded joint of TiAl alloy
图 5 TiAl合金电子束焊接接头硬度分布
Figure 5. Hardness distribution of electron beam welded joint of TiAl alloy
图 6 Ti2AlNb合金电子束焊接头经局部热处理后的显微组织
Figure 6. Microstructure of Ti2AlNb alloy electron beam welded joints after local heat treatment
图 8 TiAl合金电子束焊后热处理焊接接头硬度分布
Figure 8. Hardness distribution of welded joints after electron beam heat treatment of TiAl alloy
图 9 整体热处理温度对焊后接头显微硬度的影响
Figure 9. Effect of overall heat treatment temperature on microhardness of welded joint
表 1 Ti-12Al-25Nb合金板化学成分
Table 1. Chemical compositions of Ti-12Al-25Nb plate material
% Al Nb V O H N Ti 10.62 45.22 5.42 ≤0.08 ≤0.01 ≤0.02 余量 
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表 2 Ti-12Al-25Nb合金基本性能
Table 2. Main properties of Ti-12Al-25Nb
温度/℃ 抗拉强度/MPa 屈服强度/MPa 延伸率/% 弹性模量/GPa 室温 1045 947 11.399 103 650 952 846 640 91
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表 3 TiAl合金焊接与热处理工艺参数
Table 3. Process parameters of electron beam welding and heat treatment of TiAl alloy
序号 工艺 加速电压
U/kV聚焦电流If/mA 电子束流Ib/mA 焊接速度v/(mm·min−1) 扫描时间t/s 1 焊态 120 500 30 800 − 2 局部热处理 120 600 6 400 800
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