Microstructure and crack sensitivity of electron beam welded titanium aluminide joints

Hui Qiang Wu; Ji Cai Feng; Peng He; Jing Shan He

Microstructure and crack sensitivity of electron beam welded titanium aluminide joints

Hui Qiang Wu
, Ji Cai Feng^*
, Peng He
, Jing Shan He

^*Corresponding author for this work

School of Materials Science and Engineering

Harbin Institute of Technology

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

Abstract

Microstructural characterization and crack formed mechanism during electron beam welding of titanium aluminide Ti-45A1-1. 7Cr-1. 7Nb were investigated. The results show that the welded microstructurc exhibits columnar and dendritic structure. Microstructural constituents in the fusion zone are a massive gamma structure and some lamellar structure consists of alternating platelets of a₂ and γ. The major contributing factor of the susceptibility to solidstate cracking is thermally induced stress. The import role of the suppression of the a phase decomposition, the difference of a ₂/γ phases thermal expansion coefficient and the lamellar spacing changes of lamellar structure with cooling rate all play effect on the crack forming mechanism.

Original language	English
Pages (from-to)	1-4
Number of pages	4
Journal	Transactions of Nonferrous Metals Society of China (English Edition)
Volume	15
Issue number	SPEC. ISS. 2
State	Published - Apr 2005

Keywords

Crack
Electron beam welding
Microstructure
Titanium aluminide

Cite this

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title = "Microstructure and crack sensitivity of electron beam welded titanium aluminide joints",

abstract = "Microstructural characterization and crack formed mechanism during electron beam welding of titanium aluminide Ti-45A1-1. 7Cr-1. 7Nb were investigated. The results show that the welded microstructurc exhibits columnar and dendritic structure. Microstructural constituents in the fusion zone are a massive gamma structure and some lamellar structure consists of alternating platelets of a2 and γ. The major contributing factor of the susceptibility to solidstate cracking is thermally induced stress. The import role of the suppression of the a phase decomposition, the difference of a 2/γ phases thermal expansion coefficient and the lamellar spacing changes of lamellar structure with cooling rate all play effect on the crack forming mechanism.",

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year = "2005",

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language = "英语",

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pages = "1--4",

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T1 - Microstructure and crack sensitivity of electron beam welded titanium aluminide joints

AU - Wu, Hui Qiang

AU - Feng, Ji Cai

AU - He, Peng

AU - He, Jing Shan

PY - 2005/4

Y1 - 2005/4

N2 - Microstructural characterization and crack formed mechanism during electron beam welding of titanium aluminide Ti-45A1-1. 7Cr-1. 7Nb were investigated. The results show that the welded microstructurc exhibits columnar and dendritic structure. Microstructural constituents in the fusion zone are a massive gamma structure and some lamellar structure consists of alternating platelets of a2 and γ. The major contributing factor of the susceptibility to solidstate cracking is thermally induced stress. The import role of the suppression of the a phase decomposition, the difference of a 2/γ phases thermal expansion coefficient and the lamellar spacing changes of lamellar structure with cooling rate all play effect on the crack forming mechanism.

AB - Microstructural characterization and crack formed mechanism during electron beam welding of titanium aluminide Ti-45A1-1. 7Cr-1. 7Nb were investigated. The results show that the welded microstructurc exhibits columnar and dendritic structure. Microstructural constituents in the fusion zone are a massive gamma structure and some lamellar structure consists of alternating platelets of a2 and γ. The major contributing factor of the susceptibility to solidstate cracking is thermally induced stress. The import role of the suppression of the a phase decomposition, the difference of a 2/γ phases thermal expansion coefficient and the lamellar spacing changes of lamellar structure with cooling rate all play effect on the crack forming mechanism.

KW - Crack

KW - Electron beam welding

KW - Microstructure

KW - Titanium aluminide

UR - https://www.scopus.com/pages/publications/77955463365

M3 - 文章

AN - SCOPUS:77955463365

SN - 1003-6326

VL - 15

SP - 1

EP - 4

JO - Transactions of Nonferrous Metals Society of China (English Edition)

JF - Transactions of Nonferrous Metals Society of China (English Edition)

IS - SPEC. ISS. 2

ER -

Microstructure and crack sensitivity of electron beam welded titanium aluminide joints

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