Repair of directionally solidified superalloy GTD-111 by laser-engineered net shaping

GTD-111 directionally solidified superalloy was repaired by the Nd:YAG laser based laser-engineered net shaping (LENS) process. Selection of process parameters are discussed against the formation of deposits and occurrence of defects. Formation of microfissures, porosity, lack of fusion, and stray c...

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Bibliographic Details
Published in:Journal of materials science 2006-12, Vol.41 (23), p.7886-7893
Main Author: Li, Leijun
Format: Article
Language:English
Subjects:
Cross-disciplinary physics: materials science
rheology
Crystal defects
Directional solidification
Exact sciences and technology
Laser applications
Lasers
Materials science
Melting
Neodymium lasers
Other topics in materials science
Physics
Porosity
Process parameters
Rapid prototyping
Semiconductor lasers
Superalloys
YAG lasers
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Summary:GTD-111 directionally solidified superalloy was repaired by the Nd:YAG laser based laser-engineered net shaping (LENS) process. Selection of process parameters are discussed against the formation of deposits and occurrence of defects. Formation of microfissures, porosity, lack of fusion, and stray crystals in the deposit zone was studied. It was identified that formation of stray crystals in the directionally solidified alloy could be due to two types of sources: the shape of the melt pool, and the existence of second-phase particles at the melt pool fusion boundary.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-006-0948-0