Microstructural characterization of electron beam welded joints of TiAl-based intermetallic compound

Huiqiang Wu; Jicai Feng; Jingshan He; Li Zhou

Microstructural characterization of electron beam welded joints of TiAl-based intermetallic compound

Huiqiang Wu^*
, Jicai Feng
, Jingshan He
, Li Zhou

^*Corresponding author for this work

School of Materials Science and Engineering

Harbin Institute of Technology

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

4 Scopus citations

Abstract

The feasibility to use electron beam welding to join the nominal composition Ti-48Al-2Cr-2Nb (at.%) alloy was assessed. The microstructure characterization and cracking susceptibility of the joints were evaluated by means of OM, SEM, XRD and microhardness. It was found that the welded microstructure exhibited columnar and dendritic structures. Microstructural constituents in the fusion zone were a massive gamma structure and some amount of lamellar structure consisting of alternating platelets of α₂ and γ. The major contributing factor to the susceptibility to solidification cracking was microsturctural change in this study for the suppression of a phase decomposition leading to produce more retained α₂ brittle phase. Compared with transgranular cleavage fracture in the base metal, the weld metal exhibited mainly translamellar fracture.

Original language	English
Pages (from-to)	82-86
Number of pages	5
Journal	Rare Metals
Volume	24
Issue number	1
State	Published - Mar 2005

Keywords

Crack
Electron beam welding
Microstructure
Titanium aluminide

Cite this

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title = "Microstructural characterization of electron beam welded joints of TiAl-based intermetallic compound",

abstract = "The feasibility to use electron beam welding to join the nominal composition Ti-48Al-2Cr-2Nb (at.\%) alloy was assessed. The microstructure characterization and cracking susceptibility of the joints were evaluated by means of OM, SEM, XRD and microhardness. It was found that the welded microstructure exhibited columnar and dendritic structures. Microstructural constituents in the fusion zone were a massive gamma structure and some amount of lamellar structure consisting of alternating platelets of α2 and γ. The major contributing factor to the susceptibility to solidification cracking was microsturctural change in this study for the suppression of a phase decomposition leading to produce more retained α2 brittle phase. Compared with transgranular cleavage fracture in the base metal, the weld metal exhibited mainly translamellar fracture.",

keywords = "Crack, Electron beam welding, Microstructure, Titanium aluminide",

author = "Huiqiang Wu and Jicai Feng and Jingshan He and Li Zhou",

year = "2005",

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language = "英语",

volume = "24",

pages = "82--86",

journal = "Rare Metals",

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TY - JOUR

T1 - Microstructural characterization of electron beam welded joints of TiAl-based intermetallic compound

AU - Wu, Huiqiang

AU - Feng, Jicai

AU - He, Jingshan

AU - Zhou, Li

PY - 2005/3

Y1 - 2005/3

N2 - The feasibility to use electron beam welding to join the nominal composition Ti-48Al-2Cr-2Nb (at.%) alloy was assessed. The microstructure characterization and cracking susceptibility of the joints were evaluated by means of OM, SEM, XRD and microhardness. It was found that the welded microstructure exhibited columnar and dendritic structures. Microstructural constituents in the fusion zone were a massive gamma structure and some amount of lamellar structure consisting of alternating platelets of α2 and γ. The major contributing factor to the susceptibility to solidification cracking was microsturctural change in this study for the suppression of a phase decomposition leading to produce more retained α2 brittle phase. Compared with transgranular cleavage fracture in the base metal, the weld metal exhibited mainly translamellar fracture.

AB - The feasibility to use electron beam welding to join the nominal composition Ti-48Al-2Cr-2Nb (at.%) alloy was assessed. The microstructure characterization and cracking susceptibility of the joints were evaluated by means of OM, SEM, XRD and microhardness. It was found that the welded microstructure exhibited columnar and dendritic structures. Microstructural constituents in the fusion zone were a massive gamma structure and some amount of lamellar structure consisting of alternating platelets of α2 and γ. The major contributing factor to the susceptibility to solidification cracking was microsturctural change in this study for the suppression of a phase decomposition leading to produce more retained α2 brittle phase. Compared with transgranular cleavage fracture in the base metal, the weld metal exhibited mainly translamellar fracture.

KW - Crack

KW - Electron beam welding

KW - Microstructure

KW - Titanium aluminide

UR - https://www.scopus.com/pages/publications/18444410726

M3 - 文章

AN - SCOPUS:18444410726

SN - 1001-0521

VL - 24

SP - 82

EP - 86

JO - Rare Metals

JF - Rare Metals

IS - 1

ER -

Microstructural characterization of electron beam welded joints of TiAl-based intermetallic compound

Abstract

Keywords

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