材料科学
流动应力
复合材料
动态再结晶
变形(气象学)
本构方程
位错
打滑(空气动力学)
极限抗拉强度
软化
可塑性
应变率
变形机理
钛合金
压力(语言学)
微观结构
合金
热力学
热加工
有限元法
哲学
物理
语言学
作者
Zekun Yang,Jianjun Wu,Mengyuan Wang,Zongcai Zhang,Jun Yan,Wei‐Tao Wu,Long Liu,Hui Wang,Wenzhuo Wang
标识
DOI:10.1016/j.mtcomm.2023.107336
摘要
Understanding the deformation behavior of high-strength TA18 titanium alloy tube (HS-TA18 tube) under warm forming conditions and the accurate description of flow stress is the basis of tube bending forming research. To this end, in this study, the HS-TA18 tube of 18 mm × 1.5 mm (out diameter × wall thickness) as the objective, uniaxial tensile tests were conducted under a wide temperature range (25 ℃−500 ℃). Then the macroscopic mechanical behavior and microstructure evolution were analyzed. The results show that the flow stress decreases with the increase of temperature. In the temperature range of 200–450 ℃, the degree of decline slows down. Moreover, the effect of strain rate on flow stress is not obvious, which indicates that dynamic strain aging (DSA) occurs in this region. Dislocation slip is the dominant mechanism of plastic deformation in the studied temperature range. Although dynamic recrystallization at 500 ℃ leads to softening trend of flow stress, dynamic recovery (DRV) is still the main softening mechanism during deformation. Then, a constitutive model based on dislocation density is established, which includes common thermal and athermal stresses. In addition, back stresses associated with geometrically necessary dislocations (GNDs) and additional stress caused by DSA are also taken into account. The model is used to predict the flow stress of the HS-TA18 tube under warm forming conditions. The prediction results are in good agreement with the experimental results, indicating that the established model has excellent prediction ability.
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