Transactions of Materials and Heat Treatment

Title：Study on the simulation of hot compressing for titanium alloy Ti55531

Authors： Li Zhiyan Zheng Weiwei Sha Aixue Wei Xueye

Unit： Beijing Institute of Aeronautical Materials University of Science ＆ Technology Beijing

KeyWords： titanium alloy Ti55531 hot compression stress activation energy

ClassificationCode：TG456.3

year,vol(issue):pagenumber：2015,40(6):121-125

Abstract：

The flow stress behavior of titanium alloy Ti55531 during hot compression deformation was studied by high temperature compression test at the deformation temperature 700-900 ℃ and the strain rate 0.001-10 s-1 on the Gleeble-1500 press. The results show that the curve at （α+β）phase is of re-crystallization, while the curve at β phase is of dynamic recovery. The flow stress decreases with the increase of deformation temperature but increases with the increasing strain rate. Its deformation activation energy is determined by the Hyperbolic sine model, namely, 407.75 kJ·mol-1 on（α+β）phase and 157.97 kJ·mol-1 on β phase, and the constitutive equations at（α+β）phase were β phase are established. The results of error analysis show that the relative error between the calculated and experimental values of flow stress is less than 10%. Thus, the constitutive equation can be used to describe the flow behavior of titanium alloy Ti55531 in the hot-working process.

Funds：

航空科学基金资助项目（2012ZEL056）

李志燕（1982-），女，硕士，工程师

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