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- Title
Solidification Behavior and the Evolution of Phase in Laser Rapid Forming of Graded Ti6AI4V-Rene88DT Alloy.
- Authors
Lin, X.; Yue, T. M.; Yang, H. O.; Huang, W. D.
- Abstract
The graded material of Ti6A14V-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 Ti6AI4V to Ti6AI4V-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 + Ti[sub2]Ni → β + Ti[sub2]Ni, 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 colurnnar-to-equiaxed transition observed in the graded material was explained, based on Hunt's criterion. Finally, the morphology of β + Ti[sub2]Ni anomalous eutectic is discussed.
- Subjects
HEAT resistant alloys; LASERS in metallurgy; EUTECTICS; SOLIDIFICATION; RAPID solidification processing of metals; INDUSTRIAL engineering; SOLID-state lasers
- Publication
Metallurgical & Materials Transactions. Part A, 2007, Vol 38, Issue 1, p127
- ISSN
1073-5623
- Publication type
Article
- DOI
10.1007/s11661-006-9021-5