(1. 洛陽船舶材料研究所，洛陽 471023；
2. 洛陽雙瑞精鑄鈦業(yè)有限公司，洛陽 471023)
摘 要: 結合性能測試以及OM、SEM、EBSD分析結果，研究了熱軋工藝和退火溫度對Ti70板材力學性能和各向異性的影響規(guī)律及機理。結果表明：軋制工藝對板材力學性能和各向異性具有顯著影響，與軋制溫度在β相變點附近的傳統(tǒng)軋制工藝相比，超低溫大變形量的創(chuàng)新軋制工藝的綜合力學性能較高且各向異性得到改善。在600~690 ℃范圍內退火，隨著溫度的升高，強度和沖擊功隨之降低，而伸長率隨之增加，但其對各向異性的改善不明顯；同時發(fā)現(xiàn)經630 ℃退火后，板材性能滿足船舶在海上運行時的使用要求。創(chuàng)新軋制工藝使得α相由傳統(tǒng)工藝的粗片狀(間距約6 μm)轉變?yōu)榧毿±w維狀(間距約2 μm)，通過組織纖維化提高性能；同時創(chuàng)新工藝的交叉換向軋制能夠改善板材各向異性。
關鍵字: Ti70合金；交叉換向軋制；織構；各向異性
（1. Luoyang Ship Material Research Institute, Luoyang 471023, China;
2. Luoyang Sunrui Titanium Precision Casting Company Limited, Luoyang 471023, China）
Abstract:The effects of rolling process and annealing temperature on the mechanical properties and anisotropy of Ti70 sheets were studied by means of OM, SEM and EBSD. The results show that rolling processes have significant effect on the mechanical properties and anisotropy of the sheets. Compared with the traditional rolling process at the rolling temperature near the β phase transition point, the innovative rolling process with ultra-low temperature and large deformation has higher comprehensive mechanical properties and improved anisotropy. In the range of 600-690 ℃, with the increase of annealing temperature, the strength and impact energy decrease, but the elongation increases, and the improvement of anisotropy is not obvious. At the same time, it is found that the properties meet the requirements of the ship operating on the sea after sheet annealing at 630 ℃. The innovative rolling process makes the α phase change from coarse flake (with spacing of about 6 μm) to fine fiber (with spacing of about 2 μm), and improves the properties through tissue fibrosis; and the cross reversing rolling of the innovative process can improve the anisotropy of plate.
Key words: Ti70 alloy; cross reversing rolling; texture; anisotropy
