Microstructure evolution of electron beam welded Ti{sub 3}Al-Nb joint

Journal Article · Mon Feb 14 23:00:00 EST 2005 · Materials Characterization

DOI:https://doi.org/10.1016/j.matchar.2004.11.006· OSTI ID:20748733

Jicai, Feng ^[1]; Huiqiang, Wu ^[1]; Jingshan, He ^[1]; Bingang, Zhang ^[1]

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1. State Key Laboratory of Advanced Welding Production Technology, Harbin Institute of Technology, Harbin 150001, Heilongjiang Province (China)

The microstructure evolution characterization in high containing Nb, low Al titanium aluminide alloy of electron beam welded joints was investigated by means of OM, SEM, XRD, TEM and microhardness analysis. The results indicated that the microstructure of the weld metal made with electron beam under the welding conditions employed in this work was predominantly metastable, retaining ordered {beta} phase (namely B2 phase), and was independent of the welding parameters but independent of the size and the orientation of the weld solidification structures. As the heat input is decreased, the cellular structure zone is significantly reduced, and then the crystallizing morphology of fusion zone presented dendritically columnar structure. There existed grain growth coarsening in heat affected zone (HAZ) for insufficient polygonization. Both fusion zone (FZ) and the HAZ had higher microhardness than the base metal.

• OSTI ID: 20748733
• Journal Information: Materials Characterization, Journal Name: Materials Characterization Journal Issue: 2 Vol. 54; ISSN 1044-5803; ISSN MACHEX
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALLOYS
ELECTRON BEAM WELDING
ELECTRON BEAMS
EVOLUTION
GRAIN GROWTH
HEAT
HEAT AFFECTED ZONE
MICROHARDNESS
MICROSTRUCTURE
MORPHOLOGY
ORIENTATION
SCANNING ELECTRON MICROSCOPY
SOLIDIFICATION
TITANIUM
TRANSMISSION ELECTRON MICROSCOPY
WELDED JOINTS
X-RAY DIFFRACTION