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为了深入了解渗氢及变形速率对BT16钛合金冷镦性能的影响,采用光学显微镜(OM)和显微硬度的方法,研究了BT16钛合金渗氢压缩试样中的剪切带。结果表明:在300mm/s的压缩速率下,中心区变形流线与剪切带保持平行;在75mm/s的压缩速率下,剪切带中心区与剪切变形过渡区边界模糊,变形流线与剪切带呈一定的小角度。在300mm/s的压缩速率下形成的剪切带中心区显微硬度值近似为常数,且低于基体硬度值,剪切带中心区与基体之间存在一个硬度值线性增加的过渡区。对剪切带形成过程进行了分析,提出了利用变形流线计算剪切带最大应变的方法。
In order to understand the effect of hydrogen permeation and deformation rate on the cold heading performance of BT16 titanium alloy, the shear bands in the hydrogen-impregnated BT16 titanium alloy samples were studied by optical microscope (OM) and microhardness test. The results show that under the compression rate of 300 mm / s, the deformation streamlines in the central zone are parallel to the shear band. At the compression rate of 75 mm / s, the boundaries between the shear zone center and the shear deformation zone are blurred and the deformed flow lines With the shear zone was a small angle. The microhardness value in the center of the shear zone formed at a compression rate of 300 mm / s is approximately constant and below the hardness value of the substrate. There is a transition zone between the center of the shear zone and the substrate with a linear increase in hardness value. The forming process of shear band is analyzed, and the method to calculate the maximum strain of shear band by using deformation streamline is proposed.