冷旋鍛變形對TB9鈦合金顯微組織和拉伸性能的影響

冷旋鍛變形對TB9鈦合金顯微組織和拉伸性能的影響Effect of Cold Rotary-swaging Deformation on Microstructure and Tensile Properties of TB9 Titanium Alloy

采用冷旋鍛對TB9鈦合金棒材進行多道次冷變形，利用OM、EBSD、TEM以及拉伸等實驗研究了不同冷變形量TB9鈦合金棒材的顯微組織、織構和拉伸性能及其規律。結果表明，TB9鈦合金棒材的晶粒尺寸隨冷旋鍛變形量的增大而減小，部分晶粒尺寸達到納米級。同時，晶粒隨變形量的增加沿旋鍛軸向轉動，形成擇優取向，由初始{001}<110>和{001}<100>織構轉變為<110>取向的α-fiber和γ-fiber{001}<110>，{112}<110>和{111}<110>織構。在亞結構、小尺寸晶粒以及織構的共同作用下TB9鈦合金的強度隨變形量的增大而增加，延伸率和面縮率在70%冷變形后仍保持在一個較高的水平，具有優異的冷變形能力。

TB9 titanium alloy has been widely used for aerospace due to it’s superior low stiffness, corrosion resistance and workability. It has been reported that cold deformation can improve the comprehensive mechanical properties of titanium alloys. At the same time, the cold rotary-swaging deformation facilitates the production of small batches and the acquisition of special shape and size bars. However, current studies on the microstructure and properties of cold rotary-swaged titanium alloys are not systematic. So, the effects of different cold deformation rates on the microstructure, texture evolution and mechanical property of TB9 alloy during cold rotary-swaging were investigated using OM, EBSD, XRD, TEM and tensile test. The results showed that the grains size of TB9 titanium were refined with the increase in diameter reduction. Meanwhile, with the deformation increases, the grains rotation along the swaging axis occurs, forming a preferred orientation, the textures change from initial {001}<110> and {001}<100> to α-fiber and γ-fiber {001}<110>, {112}<110> and {111}<110>. All of grains refinement, texture components and substructures contributed to the enhancement of strength after cold rotary-swaging. And the ductile kept on a high level after 70% cold working, which means the TB9 titanium has a great cold deformation ability.

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