(1. 北京航空制造工程研究所，北京 100024；
2. 西北工業(yè)大學 材料學院，西安 710072)
摘 要:
利用Gleeble高溫壓縮模擬實驗研究置氫對Ti-6Al-4V合金微觀組織和高溫變形行為的影響，并探討組織與高溫塑性的關系。結果表明：適量的氫可顯著降低鈦合金的高溫變形流變應力，Ti-6Al-4V合金氫含量為0.3%時，流變應力降低36%~60%，最小峰值應力對應的氫含量隨溫度的增加向低氫方向移動，并且在保持相同應力水平下，高溫變形溫度降低
關鍵字: 置氫Ti-6Al-4V合金；顯微組織；高溫變形
（1. Beijing Aeronautical Manufacturing Technology Research Institute, Beijing 100024, China
2. Materials School, Northwestern Polytechnical University, Xi’an 710072, China）
Abstract:The effect of hydrogenation on the microstructure and high temperature deforming behavior of Ti-6Al-4V alloy was investigated by Gleeble thermal simulation test. The correlation between microstructure and high temperature behavior has been explored too. The results show that a certain amount of hydrogen in Ti-6Al-4V alloy can significantly reduce the flow stress of high temperature deformation. Adding 0.3% hydrogen in Ti-6Al-4V alloy allows a reduction of 36%−60% in forging stress and the hydrogen content that corresponds to the minimum flow stress generally decreases when the temperature increases. While keeping the same stress level, the deformation temperature decreases about 50 ℃. Hydrogen can promote the dynamic recrystallization and dynamic recovery during deformation, as a result, the flow stress may decrease and the true strain-true stress curves of hydrogenated alloy don’t show hardening stage obviously. Furthermore, the microstructure changes produced by increasing hydrogen content that happens during hot compression at a fixed temperature are equal to that obtained at higher temperature.
Key words: hydrogenated Ti-6Al-4V alloy; microstructure; high temperature deformation
