Superplastic-like forming of Ti-6Al-4V alloy

作者：Liu Jun; Tan Ming Jen^*; Aue u lan Yingyot; Guo Meiling; Castagne Sylvie; Chua Beng Wah

来源：International Journal of Advanced Manufacturing Technology, 2013, 69(5-8): 1097-1104.

DOI：10.1007/s00170-013-5101-z

• Superplastic forming
• Drawing
• Ti-6Al-4V
• Oxidation
• Microstructure
• Recrystallization

Superplastic forming of titanium alloys is used for producing structural components, since it is an effective way to manufacture complex-shaped parts in a one-step operation. An optimized sheet-forming process has been designed incorporating a non-isothermal heating system to establish a fast forming process. This work sought to expand the advantages of the technology to the forming of Ti-6Al-4V alloy at 800 A degrees C and shorter cycle time. The minimum thicknesses area was found at the outward corners, showing a maximum percent thinning of 54 %. In addition to stress variations, the cracks resulting from hot drawing and the oxidation on the sheet surface are the other reasons leading to thickness reduction. From the oxidization behavior of Ti-6Al-4V alloy, it was revealed that the decrease in forming temperature from 900 to 800 A degrees C significantly reduced the formation rate of oxide film on the sheet surface. The study also showed that the main microstructure evolution of Ti-6Al-4V alloy under these conditions was recrystallization.

• 出版日期2013-11
• 单位南阳理工学院