置氢TC4钛合金激光焊接接头纵向焊缝超塑变形性能研究

发布时间：2018-10-20 13:07

【摘要】：采用置氢处理的方法调节TC4钛合金激光焊接接头组织状态,以期提高接头超塑变形均匀性,而置氢TC4钛合金激光焊纵向焊缝接头超塑性变形行为的研究是改善结构均匀性的基础。因此针对置氢量对TC4激光焊接接头峰值流变应力、焊板延伸率、组织均匀性的影响展开了研究。结果表明:激光焊板超塑性变形峰值流变应力随含氢量的增大而增大,随变形温度的升高而降低,随变形速率的增大而增大;试样延伸率随含氢量的增大而减小,随变形温度的升高而增大,随变形速率的增大而减小。在含氢量0.291%,变形温度920℃,变形速率10~(-4)s~(-1)时,峰值流变应力最小达到20.7 MPa,焊板延伸率达到最大312%。
[Abstract]:In order to improve the uniformity of superplastic deformation, the microstructure of TC4 titanium alloy laser welded joints was adjusted by hydrogen insertion. The study of superplastic deformation behavior of TC4 titanium alloy laser welded longitudinal weld joint is the basis to improve the structural uniformity. Therefore, the effects of hydrogen content on the peak flow stress, elongation and microstructure uniformity of TC4 laser welded joints were studied. The results show that the peak flow stress of superplastic deformation increases with the increase of hydrogen content, decreases with the increase of deformation temperature and increases with the increase of deformation rate, and the elongation decreases with the increase of hydrogen content. It increases with the increase of deformation temperature and decreases with the increase of deformation rate. When the hydrogen content is 0.291, the deformation temperature is 920 鈩，

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