Microstructure and mechanical properties at elevated temperature of laser-welded Ti–22Al–25Nb alloy sheets

Beibei Kong; Dongjun Wang; Faye Zang; Kehuan Wang; Gang Liu

doi:10.1016/j.intermet.2019.106516

Microstructure and mechanical properties at elevated temperature of laser-welded Ti–22Al–25Nb alloy sheets

Beibei Kong
, Dongjun Wang
, Faye Zang
, Kehuan Wang
, Gang Liu^*

^*Corresponding author for this work

School of Materials Science and Engineering

Harbin Institute of Technology
Shandong Jiaotong University

Research output: Contribution to journal › Article › peer-review

3 Scopus citations

Abstract

The tensile tests of laser-welded Ti–22Al–25Nb alloy with a transverse joint are carried out in temperatures ranging from 850 °C to 930 °C. The result showed that 875 °C was a critical temperature. The critical temperature could determine the fracture mode of welded samples due to the microstructural differences between the fusion zone and base metal. Fracture occurred in the welded joint when deformation temperature was less than 875 °C, while it occurred in base metal in temperature range 880–930 °C. Besides, volume fraction of spherical and strip-like α₂/O grains in the fusion zone decreased with increasing temperature, and long axes of the strip-like grains showed a certain angle with respect to β/B2-phase grain boundaries. These strip-like grains impeded crack nucleation and propagation to some extent.

Original language	English
Article number	106516
Journal	Intermetallics
Volume	112
DOIs	https://doi.org/10.1016/j.intermet.2019.106516
State	Published - Sep 2019

Keywords

Crack mode
Laser-welded joint of Ti–22Al–25Nb alloy
Lattice distortion
Mechanical properties
Microstructure

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10.1016/j.intermet.2019.106516

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@article{fc33cd0cf9564ae69c8d932011354099,

title = "Microstructure and mechanical properties at elevated temperature of laser-welded Ti–22Al–25Nb alloy sheets",

abstract = "The tensile tests of laser-welded Ti–22Al–25Nb alloy with a transverse joint are carried out in temperatures ranging from 850 °C to 930 °C. The result showed that 875 °C was a critical temperature. The critical temperature could determine the fracture mode of welded samples due to the microstructural differences between the fusion zone and base metal. Fracture occurred in the welded joint when deformation temperature was less than 875 °C, while it occurred in base metal in temperature range 880–930 °C. Besides, volume fraction of spherical and strip-like α2/O grains in the fusion zone decreased with increasing temperature, and long axes of the strip-like grains showed a certain angle with respect to β/B2-phase grain boundaries. These strip-like grains impeded crack nucleation and propagation to some extent.",

keywords = "Crack mode, Laser-welded joint of Ti–22Al–25Nb alloy, Lattice distortion, Mechanical properties, Microstructure",

author = "Beibei Kong and Dongjun Wang and Faye Zang and Kehuan Wang and Gang Liu",

note = "Publisher Copyright: {\textcopyright} 2019 Elsevier Ltd",

year = "2019",

month = sep,

doi = "10.1016/j.intermet.2019.106516",

language = "英语",

volume = "112",

journal = "Intermetallics",

issn = "0966-9795",

publisher = "Elsevier Ltd",

}

TY - JOUR

T1 - Microstructure and mechanical properties at elevated temperature of laser-welded Ti–22Al–25Nb alloy sheets

AU - Kong, Beibei

AU - Wang, Dongjun

AU - Zang, Faye

AU - Wang, Kehuan

AU - Liu, Gang

PY - 2019/9

Y1 - 2019/9

N2 - The tensile tests of laser-welded Ti–22Al–25Nb alloy with a transverse joint are carried out in temperatures ranging from 850 °C to 930 °C. The result showed that 875 °C was a critical temperature. The critical temperature could determine the fracture mode of welded samples due to the microstructural differences between the fusion zone and base metal. Fracture occurred in the welded joint when deformation temperature was less than 875 °C, while it occurred in base metal in temperature range 880–930 °C. Besides, volume fraction of spherical and strip-like α2/O grains in the fusion zone decreased with increasing temperature, and long axes of the strip-like grains showed a certain angle with respect to β/B2-phase grain boundaries. These strip-like grains impeded crack nucleation and propagation to some extent.

AB - The tensile tests of laser-welded Ti–22Al–25Nb alloy with a transverse joint are carried out in temperatures ranging from 850 °C to 930 °C. The result showed that 875 °C was a critical temperature. The critical temperature could determine the fracture mode of welded samples due to the microstructural differences between the fusion zone and base metal. Fracture occurred in the welded joint when deformation temperature was less than 875 °C, while it occurred in base metal in temperature range 880–930 °C. Besides, volume fraction of spherical and strip-like α2/O grains in the fusion zone decreased with increasing temperature, and long axes of the strip-like grains showed a certain angle with respect to β/B2-phase grain boundaries. These strip-like grains impeded crack nucleation and propagation to some extent.

KW - Crack mode

KW - Laser-welded joint of Ti–22Al–25Nb alloy

KW - Lattice distortion

KW - Mechanical properties

KW - Microstructure

UR - https://www.scopus.com/pages/publications/85066240741

U2 - 10.1016/j.intermet.2019.106516

DO - 10.1016/j.intermet.2019.106516

M3 - 文章

AN - SCOPUS:85066240741

SN - 0966-9795

VL - 112

JO - Intermetallics

JF - Intermetallics

M1 - 106516

ER -

Microstructure and mechanical properties at elevated temperature of laser-welded Ti–22Al–25Nb alloy sheets

Abstract

Keywords

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