Process parameters optimization of Ti-6Al-4V alloy sheet during hot stretch-creep forming

作者：Xiao, Jun-jie; Li, Dong-sheng^*; Li, Xiao-qiang; Ding, Pan; Zhao, Kai; Huang, Xuan-zhao; Xu, Ming-jin

来源：Transactions of Nonferrous Metals Society of China, 2015, 25(2): 420-428.

DOI：10.1016/S1003-6326(15)63619-6

• Ti-6Al-4V alloy
• hot stretch-creep forming
• springback
• orthogonal experiment
• optimization

Hot stretch-creep forming (SCF) is a novel technique to produce hard-to-form thin-walled metal components. Comprehensively considering the analysis results of the springback angle, yield strength and microstructure, four hot SCF process parameters including temperature, stretch velocity, post stretch percentage and dwelling time of a Ti-6Al-4V alloy sheet were optimized using an orthogonal experiment. The results reveal that temperature is the most important factor on springback angle. The yield strength of the deformed material in 0 degrees direction increases, while those in directions of 45 degrees and 90 degrees fluctuate around the original value. After hot SCF, the shape of some a phases changes from short thin grains to long slender ones, and the microhardness changes very little. The optimized parameters with temperature of 700 degrees C, stretch velocity of 5 mm/min, post stretch percentage of 2% and dwelling time of 8 min are achieved finally.

• 出版日期2015-2
• 单位北京印刷学院; 北京航空航天大学