TY - JOUR
T1 - TC25G 钛合金高温变形组织演变及强塑性研究
AU - Zhang, Xiaoyuan
AU - Liu, Xianghong
AU - Du, Yuxuan
AU - Li, Fuguo
AU - Wang, Kaixuan
AU - Li, Shaoqiang
AU - Yang, Tian
N1 - Publisher Copyright:
© 2023 Rare Metals Materials and Engineering Press. All rights reserved.
PY - 2023/12
Y1 - 2023/12
N2 - Microstructure evolution of TC25G titanium alloy bar with basket microstructure after different deformation degrees was studied and the changes of its thermal stability and creep resistance at 550 °C were compared. The results show that the tensile plasticity after thermal exposure increases and the creep resistance decreases with the increase in deformation degree. The plasticity and creep resistance match well at 100% deformation degree and can meet the requirements of engineering application. The increase in deformation degree corresponds to the spheroidizing process of lamellar α phase. Before the lamellar α phase is fully spheroidized, the interface strengthening effect of multi-layer structure makes the alloy have good creep resistance at high temperature. However, after α-phase spheroidization, the alloy has better plasticity because of the microstructure dominated by equiaxed microstructure. With the increase in deformation degree, the size of the fracture dimples becomes smaller and more uniform, and the dimple depth increases, which indicates that the plasticity after thermal exposure increases. The results of nano-hardness test show that the microhardness of primary α phase is higher than that of β transforms, and the creep resistance can be improved by adjusting the content and distribution of α phase in the alloy by solution temperature. The extent of lamellar α phase spheroidization can be controlled to obtain the best matching of strength and plasticity at high temperature.
AB - Microstructure evolution of TC25G titanium alloy bar with basket microstructure after different deformation degrees was studied and the changes of its thermal stability and creep resistance at 550 °C were compared. The results show that the tensile plasticity after thermal exposure increases and the creep resistance decreases with the increase in deformation degree. The plasticity and creep resistance match well at 100% deformation degree and can meet the requirements of engineering application. The increase in deformation degree corresponds to the spheroidizing process of lamellar α phase. Before the lamellar α phase is fully spheroidized, the interface strengthening effect of multi-layer structure makes the alloy have good creep resistance at high temperature. However, after α-phase spheroidization, the alloy has better plasticity because of the microstructure dominated by equiaxed microstructure. With the increase in deformation degree, the size of the fracture dimples becomes smaller and more uniform, and the dimple depth increases, which indicates that the plasticity after thermal exposure increases. The results of nano-hardness test show that the microhardness of primary α phase is higher than that of β transforms, and the creep resistance can be improved by adjusting the content and distribution of α phase in the alloy by solution temperature. The extent of lamellar α phase spheroidization can be controlled to obtain the best matching of strength and plasticity at high temperature.
KW - creep resistance
KW - microstructure evolution
KW - TC25G titanium alloy
KW - thermal stability
UR - http://www.scopus.com/inward/record.url?scp=85182401659&partnerID=8YFLogxK
U2 - 10.12442/j.issn.1002-185X.20220922
DO - 10.12442/j.issn.1002-185X.20220922
M3 - 文章
AN - SCOPUS:85182401659
SN - 1002-185X
VL - 52
SP - 4227
EP - 4237
JO - Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering
JF - Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering
IS - 12
ER -