Open AccessHot-pack Accumulative Roll-bonding (HP-ARB) Process of Ti-44Al-5Nb-1Mo-(V, B) Alloys
Author(s) -
Tianrui Li,
Guohuai Liu,
Ruiqi Guo,
Xiuqi Wang,
Zhaodong Wang
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/772/1/012085
Subject(s) - microstructure , accumulative roll bonding , materials science , ultimate tensile strength , alloy , metallurgy , ductility (earth science) , ingot , deformation (meteorology) , composite material , creep
Ti-44Al-5Nb-1Mo-(V, B) alloy preforms were processed under hot-pack accumulative roll-bonding (HP-ARB) process directly from HIPed ingot. A thin crack-free HP-ARB sheet was obtained. The corresponding microstructure evolution, alloy element distribution, and tensile properties were systematically studied. The alloy matrix were measured as ∼703-844 μm, while the defect-free bonding interfaces were measured as ∼96 and 221 μm. Near-lamellae and fine near-duplex microstructure were characterized in the bonding interface and the sheet matrix, respectively. The differences of stress state between the alloy matrix and the plate edge, and large deformation strain during HP-ARB are considered to be the main factors to form the microstructure characteristics. After HP-ARB, the sheet exhibited high performance at room-temperature (RT) as well as high-temperature. Ultimate tensile stress (UTS) of 863 Mpa and ductility of 1.71% were exhibited at RT. The 800 oC and 850 oC UTS/ductility were 754 Mpa/7.24% and 599 Mpa/67.5%, respectively. The pure bonding interface and fine homogeneous microstructure contributed positively to the RT and high-temperature tensile properties.