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利用Gleeble 3800热模拟试验机研究了挤压态Ti-1300合金管材的高温变形行为,试验温度750~950℃、应变速率0.001~1 s~(-1)、最大变形量70%。结果表明:Ti-1300合金管材高温变形应力先随应变的增大而增加,到达峰值应力后逐渐降低,最后趋于稳态。峰值应力随变形温度的降低和应变速率的升高而升高。根据Arrhenius公式,建立了该合金管材的本构模型:ε觶=2.8437×10~8×[sinh(9.40×10~(-3)σ)]~(2.90958)×exp(-218.586/RT)。计算的流变应力与试验结果符合较好,该模型可为实际生产提供理论指导。
The deformation behavior of extruded Ti-1300 alloy pipe was investigated by Gleeble 3800 thermal simulation test machine. The test temperature was 750-950 ℃, the strain rate was 0.001-1 s -1, and the maximum deformation was 70%. The results show that the high temperature deformation stress of Ti-1300 alloy pipe first increases with the increase of strain, reaches the peak stress and then decreases gradually, and finally reaches the steady state. Peak stress increases with decreasing deformation temperature and increasing strain rate. According to the Arrhenius formula, the constitutive model of the alloy pipe is established: ε 觯 = 2.8437 × 10 ~ 8 × [sinh (9.40 × 10 -3 σ)] ~ (2.90958) × exp (-218.586 / RT). The calculated flow stress is in good agreement with the experimental results. The model can provide theoretical guidance for actual production.