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Metallurgical and Materials Transactions A
Published in: Metallurgical and Materials Transactions A 1/2007

01-01-2007

Solidification Behavior and the Evolution of Phase in Laser Rapid Forming of Graded Ti6Al4V-Rene88DT Alloy

Authors: X. Lin, T.M. Yue, H.O. Yang, W.D. Huang

Published in: Metallurgical and Materials Transactions A | Issue 1/2007

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Abstract

The graded material of Ti6Al4V-Rene88DT superalloy, which has shown the potential to be applied in aeroengines, was fabricated from prealloyed metal powders using the technique of laser rapid forming (LRF). A compositional gradient, from 100 pct Ti6Al4V to Ti6Al4V-38 pct Rene88DT, was achieved within a thickness of laser deposit of 54 mm. The solidification behavior and the phase evolution of the compositionally graded material were studied. The results of the X-ray diffraction (XRD) analysis together with the metallographic study showed that a series of phase evolutions, α + β → α + β + Ti2Ni → β + Ti2Ni, along the compositional gradient have occurred. The hardness value of the graded material was measured along the compositional gradient, and the results were explained in terms of the various phases present. The condition for columnar-to-equiaxed transition observed in the graded material was explained, based on Hunt’s criterion. Finally, the morphology of β + Ti2Ni anomalous eutectic is discussed.
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Footnotes
1
LENS: laser-engineered net shaping, originated from Sandia National Laboratory: DLF: direct light fabrication, originated from Los Alamos National Laboratory.
 
2
RENE is a trademark of General Electric Company, Fairfield, CT.
 
3
PHILIPS is a trademark of Philips Electronic Instruments Corp., Mahwah, NJ.
 
4
THERMO-CALC is a trademark Thermo-Calc, Stockholm, Sweden.
 
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Metadata
Title
Solidification Behavior and the Evolution of Phase in Laser Rapid Forming of Graded Ti6Al4V-Rene88DT Alloy
Authors
X. Lin
T.M. Yue
H.O. Yang
W.D. Huang
Publication date
01-01-2007
Publisher
Springer US
Published in
Metallurgical and Materials Transactions A / Issue 1/2007
Print ISSN: 1073-5623
Electronic ISSN: 1543-1940
DOI
https://doi.org/10.1007/s11661-006-9021-5

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