Microstructure and transformation of electron beam welded joints of TiAl base alloy

Guoqing Chen; Binggang Zhang; Jingshan He; Jicai Feng

Microstructure and transformation of electron beam welded joints of TiAl base alloy

Guoqing Chen^*
, Binggang Zhang
, Jingshan He
, Jicai Feng

^*Corresponding author for this work

School of Materials Science and Engineering

Harbin Institute of Technology

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

3 Scopus citations

Abstract

The microstructural characteristics, phase composition and transformation of the electron beam welded (EBW) joints of Ti-43Al-9V-0.3Y alloy were investigated by means of the optical microscopy, X-ray diffraction, scanning electron microscopy, transmission electron microscopy and energy disperse spectrum. The results showed that the joint microstructure is mainly composed of B2 phase. The partial α₂+γ two-phase lamellar structure and granular γ_m phase are observed. The lanthanon Y exists as YAl₂ phase and refined grains. During the heat treatment and EBW of this alloy, different transformation of the liquid metal will take place duo to the different cooling rate in the cooling period. The lamellar microstructure and Widmanstaten structure will form because of low cooling rate. The faster cooling rate can lead to the formation of the γ_m phase. The ordering transformation only happens at very fast cooling rate. The different casting structures with different properties are obtained finally.

Original language	English
Pages (from-to)	81-84
Number of pages	4
Journal	Hanjie Xuebao/Transactions of the China Welding Institution
Volume	28
Issue number	5
State	Published - May 2007

Keywords

Electron beam welding
Microstructure of joint
Microstructure transformation
TiAl based alloy

Cite this

@article{d0ac528f37194e46b3958987613a18da,

title = "Microstructure and transformation of electron beam welded joints of TiAl base alloy",

abstract = "The microstructural characteristics, phase composition and transformation of the electron beam welded (EBW) joints of Ti-43Al-9V-0.3Y alloy were investigated by means of the optical microscopy, X-ray diffraction, scanning electron microscopy, transmission electron microscopy and energy disperse spectrum. The results showed that the joint microstructure is mainly composed of B2 phase. The partial α2+γ two-phase lamellar structure and granular γm phase are observed. The lanthanon Y exists as YAl2 phase and refined grains. During the heat treatment and EBW of this alloy, different transformation of the liquid metal will take place duo to the different cooling rate in the cooling period. The lamellar microstructure and Widmanstaten structure will form because of low cooling rate. The faster cooling rate can lead to the formation of the γm phase. The ordering transformation only happens at very fast cooling rate. The different casting structures with different properties are obtained finally.",

keywords = "Electron beam welding, Microstructure of joint, Microstructure transformation, TiAl based alloy",

author = "Guoqing Chen and Binggang Zhang and Jingshan He and Jicai Feng",

year = "2007",

month = may,

language = "英语",

volume = "28",

pages = "81--84",

journal = "Hanjie Xuebao/Transactions of the China Welding Institution",

issn = "0253-360X",

publisher = "Harbin Research Institute of Welding",

number = "5",

}

TY - JOUR

T1 - Microstructure and transformation of electron beam welded joints of TiAl base alloy

AU - Chen, Guoqing

AU - Zhang, Binggang

AU - He, Jingshan

AU - Feng, Jicai

PY - 2007/5

Y1 - 2007/5

N2 - The microstructural characteristics, phase composition and transformation of the electron beam welded (EBW) joints of Ti-43Al-9V-0.3Y alloy were investigated by means of the optical microscopy, X-ray diffraction, scanning electron microscopy, transmission electron microscopy and energy disperse spectrum. The results showed that the joint microstructure is mainly composed of B2 phase. The partial α2+γ two-phase lamellar structure and granular γm phase are observed. The lanthanon Y exists as YAl2 phase and refined grains. During the heat treatment and EBW of this alloy, different transformation of the liquid metal will take place duo to the different cooling rate in the cooling period. The lamellar microstructure and Widmanstaten structure will form because of low cooling rate. The faster cooling rate can lead to the formation of the γm phase. The ordering transformation only happens at very fast cooling rate. The different casting structures with different properties are obtained finally.

AB - The microstructural characteristics, phase composition and transformation of the electron beam welded (EBW) joints of Ti-43Al-9V-0.3Y alloy were investigated by means of the optical microscopy, X-ray diffraction, scanning electron microscopy, transmission electron microscopy and energy disperse spectrum. The results showed that the joint microstructure is mainly composed of B2 phase. The partial α2+γ two-phase lamellar structure and granular γm phase are observed. The lanthanon Y exists as YAl2 phase and refined grains. During the heat treatment and EBW of this alloy, different transformation of the liquid metal will take place duo to the different cooling rate in the cooling period. The lamellar microstructure and Widmanstaten structure will form because of low cooling rate. The faster cooling rate can lead to the formation of the γm phase. The ordering transformation only happens at very fast cooling rate. The different casting structures with different properties are obtained finally.

KW - Electron beam welding

KW - Microstructure of joint

KW - Microstructure transformation

KW - TiAl based alloy

UR - https://www.scopus.com/pages/publications/34250694305

M3 - 文章

AN - SCOPUS:34250694305

SN - 0253-360X

VL - 28

SP - 81

EP - 84

JO - Hanjie Xuebao/Transactions of the China Welding Institution

JF - Hanjie Xuebao/Transactions of the China Welding Institution

IS - 5

ER -

Microstructure and transformation of electron beam welded joints of TiAl base alloy

Abstract

Keywords

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