置氢TC4钛合金激光焊接接头超塑变形组织均匀性分析
Investigation on microstructural homogeneity in laser beam welding joint superplastic deformation
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摘要: 文中采用置氢处理的方式对钛合金激光焊接接头超塑性变形组织均匀性展开研究，研究不同的置氢量对TC4钛合金激光焊接头变形均匀性和组织均匀性的影响，并引进变形不均匀性系数和组织均匀化系数来进行表征. 结果表明，置氢可以调节钛合金激光焊接接头中相组成，改善焊接接头超塑性变形均匀性. 随着置氢量的增大，组织均匀化系数越大，组织均匀化程度越高；在相同置氢量，变形温度的升高或初始应变速率的降低均会使均匀化程度上升，并在置氢量1.30%、变形温度920 ℃、应变速率1×10-4s-1的条件下接头组织均匀化系数达到了95%.Abstract: In this paper, TC4 alloy is welded by laser beam welding. Through the technology of hydrogenation treatment to analyze the structural homogeneity of the welding joint superplastic deformation .The effect of different hydrogen content on the deformation uniformity and deformation uniformity of TC4 titanium alloy laser welding joint was studied. The coefficient structural inhomogeneity of deformation is adopted to express the microstructural homogeneity. The test shows that with the technology of hydrogenation treatment, the phase composition is able to be adjusted and the homogeneity of the welding joint superplastic deformation is able to improved. With increasing hydrogen content, the coefficient structural homogeneity is decreased and the structural becomes more evenly. With the same hydrogen content, the decrease deformation temperature and the reduce initial strain rate both can improve the level of structural homogeneity. With the hydrogen content(1.30% H), the deformation temperature(920 ℃), and the initial strain rate(1×10-4 s-1), the coefficient microstructural homogeneity runs up to 95%.
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Keywords:
- hydrogenation /
- uniformity coefficient /
- superplasticity
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