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Proceedings Paper

Direct laser deposition of Inconel 738 on directionally solidified Ni-base superalloy component
Author(s): Hongqing Sun; Minlin Zhong; Wenjin Liu; Jingjiang He; Xiaoli Li
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Paper Abstract

This paper presents the research on direct laser deposition of Inconel 738 alloys on directionally solidified (DS) Ni-base supperalloy substrate in order to strengthen or repair the DS gas turbine blades. The results indicate that cracks occur very easily during the deposition process and cracks in laser deposited Inconel 738 on DS Ni-base supperalloy substrate are mostly thermal cracks which may originate on the interface between deposited layers and DS substrate, and develop to multi-deposited layers. The low melting temperature point eutectics between the grain boundaries of DS Ni-base superalloy substrate are the main sources of thermal cracks. Strict control of the heat input of the deposition process can dramatically decrease the cracking tendency. Layers with the DS characteristics are achieved by direct laser deposition on Ni-base superalloy substrate with good shaping and free of cracks by optimizing the deposition technique and laser parameters. Compared with the substrate, the microstructure of the layers is much finer, the average primary spacing of the dendrites is about 5μm. The microhardness of Inconel 738 multi-deposited layers is very uniform, indicating the structure of the layers is homogeneous. The results demonstrate the feasibility and great foreground in repairing and fabricating local parts on DS Ni-base superalloy turbine blades by direct laser fabrication technology.

Paper Details

Date Published: 13 January 2005
PDF: 9 pages
Proc. SPIE 5629, Lasers in Material Processing and Manufacturing II, (13 January 2005); doi: 10.1117/12.572238
Show Author Affiliations
Hongqing Sun, Tsinghua Univ. (China)
Minlin Zhong, Tsinghua Univ. (China)
Wenjin Liu, Tsinghua Univ. (China)
Jingjiang He, Tsinghua Univ. (China)
Xiaoli Li, Tsinghua Univ. (China)

Published in SPIE Proceedings Vol. 5629:
Lasers in Material Processing and Manufacturing II
ShuShen Deng; Akira Matsunawa; Y. Lawrence Yao; Minlin Zhong, Editor(s)

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