Tensile properties evolution of hydrogen-induced TA10 titanium alloy welded joints
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摘要: 钛合金焊接件低氢浓度下常发生氢脆失效，文中研究了充氢量对钛合金焊接接头拉伸性能的影响规律及其作用机制. 结果表明，随充氢量增加，室温强度明显提升，而塑性指标显著恶化. 充氢0.05% (质量分数)时，固溶氢对组织强化效果有限，抗拉强度略有增加；固溶氢降低了溶质原子对位错运动“钉扎”作用，屈服强度下降；固溶氢仅依靠扩散聚集，致局部微区氢浓度增加，其对塑性影响不大. 充氢0.12%后，氢化物“钉扎”作用加强，氢致位错交叉滑移更为困难，室温强度显著增加；脆性氢化物自身断裂、析出特征或加速与基体分离，致塑性显著下降. 未充氢或0.05% H时，焊接接头发生韧性断裂；充氢0.12%后，以脆性断裂为主；固溶氢、氢化物对断裂方式转变产生直接影响.Abstract: Hydrogen embrittlement of titanium alloy weldments often occur at low hydrogen concentrations. The effect of hydrogen content on tensile properties of titanium alloy welded joints and its mechanism were studied. The results show that with the increase of hydrogen content, the room temperature strength was significantly improved, the plasticity was significantly deteriorated. At 0.05 wt.% H, solid solution hydrogen had a limited effect on tissue strengthening and a slight increase in tensile strength; solid solution hydrogen reduced the "pinning" effect of solute atom on dislocation movement, yield strength decreased; solid solution hydrogen only depend on the diffusion and accumulation to cause the local micro-region hydrogen concentration to increase, which had a little effect on the plasticity. After 0.12 wt.% H, the "pinning" effect of the hydride was strengthened, the hydrogen-induced dislocation cross-slip was more difficult, and the strength at room temperature was significantly increased; the brittle hydride itself fractured, precipitated, or accelerated separation from the matrix, resulting in significant plasticity decline. When not charged with hydrogen or 0.05 wt.% H, the ductile fracture occurred in the welded joint; After 0.12 wt.% H, the brittle fracture was the main; solid solution hydrogen and the hydride had a direct effect on fracture mode transformation.
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图 2 不同充氢量钛合金焊接接头室温拉伸真应力-应变曲线
Figure 2. True stress-strain curves of the welded joints with different hydrogen content at room temperature
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图 3 充氢量与钛合金焊接接头室温拉伸性能指标曲线
Figure 3. Relationship between hydrogen content and tensile parameters of welded joints at room temperature
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图 4 充氢0.12%试样拉伸断口二次裂纹形貌
Figure 4. Secondary crack micrographs of tensile fracture in the hydrogenated 0.12% H tensile specimens
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图 5 不同充氢量钛合金焊接接头拉伸宏观断口形貌
Figure 5. Macro fracture surfaces of titanium alloy welded joints with different hydrogen content: (a) the as-received; (b) 0.05% H; (c) 0.12% H; (d) 0.21% H
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图 6 不同充氢量钛合金焊接接头室温拉伸微观断口形貌
Figure 6. Micro fracture surfaces of titanium alloy welded joints with different hydrogen content. (a) the as-received; (b) 0.05% H; (c) 0.12% H; (d) 0.21% H (low power); (e) 0.21% H (high power)
表 1 TA10合金及TA10焊丝主要化学成分 (质量分数，%)
Table 1 Chemical composition of TA10 alloy and TA10 welding wire
材料 Mo Ni Fe O C N H Ti TA10合金 0.32 0.75 0.08 0.014 0.01 0.03 0.004 余量 TA10焊丝 0.31 0.80 0.05 0.011 0.01 0.02 0.001 余量 
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