【摘要】：采用置氫處理的方法調節(jié)TC4鈦合金激光焊接接頭組織狀態(tài),以期提高接頭超塑變形均勻性,而置氫TC4鈦合金激光焊縱向焊縫接頭超塑性變形行為的研究是改善結構均勻性的基礎。因此針對置氫量對TC4激光焊接接頭峰值流變應力、焊板延伸率、組織均勻性的影響展開了研究。結果表明:激光焊板超塑性變形峰值流變應力隨含氫量的增大而增大,隨變形溫度的升高而降低,隨變形速率的增大而增大;試樣延伸率隨含氫量的增大而減小,隨變形溫度的升高而增大,隨變形速率的增大而減小。在含氫量0.291%,變形溫度920℃,變形速率10~(-4)s~(-1)時,峰值流變應力最小達到20.7 MPa,焊板延伸率達到最大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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