Liquid film migration in laser welded joint of Inconel 617

Liquid film migration (LFM) in the fiber laser welded Inconel 617 joint was investigated. The results show that the LFM occurs in HAZ of the laser welded Inconel 617 joint. The element of Mo in the migrated region is slightly richer than that in the adjacent matrix. The diffusional coherency strain...

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Bibliographic Details
Published in:Journal of materials research 2015-08, Vol.30 (15), p.2340-2347
Main Authors: Ren, Wenjie, Lu, Fenggui, Yang, Renjie, Liu, Xia, Li, Zhuguo
Format: Article
Language:English
Subjects:
Analysis
Applied and Technical Physics
Asymmetry
Atoms & subatomic particles
Biomaterials
Diffusion
Diffusion welding
Grain boundaries
Heat affected zone
Heat treating
High temperature
Inorganic Chemistry
Laser beam welding
Lasers
Liquid films
Materials Engineering
Materials research
Materials Science
Migration
Nanotechnology
Nickel base alloys
Oxidation
Solid solutions
Studies
Superalloys
Welding
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Summary:Liquid film migration (LFM) in the fiber laser welded Inconel 617 joint was investigated. The results show that the LFM occurs in HAZ of the laser welded Inconel 617 joint. The element of Mo in the migrated region is slightly richer than that in the adjacent matrix. The diffusional coherency strain due to the lattice mismatch between the element of Mo and the matrix atom is the dominant factor contributing to the occurrence of LFM in HAZ of laser welded Inconel 617. The migration of the liquid film is promoted by the thin initial liquid film and the slow cooling rate in large heat input. LFM tends to occur on the grain boundary (GB) with the fine particles and the GB-resolidified particles are formed on the GB with the large particles. Liquation cracking is reduced in the welds with the high heat input and in the solution treatment condition by LFM (1100 °C/1 h).
ISSN:0884-2914
2044-5326
DOI:10.1557/jmr.2015.205