Study On Load Relaxation Based On Hot Bending And Sizing Of Ti6Al4V Alloy Sheet
The mechanism of hot sizing following sheet thermal forming of titanium alloy is considered as stress relaxation based on creep flow.A certain amount of internal stress in sheet metal parts can be relaxed during hot-sizing stage and hence the springback can be markedly reduced.Hot v-bending of Ti6Al4V sheet were carried out to study the behavior of load relaxation and springback in specimens after hot sizing,also known as shape retention.Experimental results reveal that load relaxation occurs during hot sizing following sheet v-bending.Reduction of springback angle obtained using hot sizing is obviously larger than that obtained without hot sizing under the same thermal environment.During hot sizing,springback angle decreases with increase in temperature and time,respectively.Load relaxation behavior is affected by loading method,namely constant velocity and two step loading.The linear relation between creep rate and load relaxation rate was deduced in hot-sizing stage.The calculated ratio shows good agreement with experimental data obtained by two-step loading.V-bending and sizing together with appropriate loading method are demonstrated as a good approach for stress relaxation analysis.
Ti6Al4V Alloy V-bending Hot Sizing Stress Relaxation Springback
Liu Po Zong Yingying Shan Debin Guo Bin
School of Material Science and Engineering,Harbin Institute of Technology,Harbin 15001,PR China
国际会议
沈阳
英文
317-323
2013-07-06（万方平台首次上网日期，不代表论文的发表时间）