Effects of melt-pool geometry on grain structure evolution in multilayer laser metal deposition of a single-crystal superalloy

•Variations in melt-pool geometry affect both CET-related and OMT-related grain growth in LMD of a SX alloy.•Melt pool with large depth-to-height ratio contributes to obtain a multilayered component with quasi SX nature.•Melt pool with low depth-to-height ratio leads to a triangle-shaped columnar re...

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Bibliographic Details
Published in:Materials letters 2025-01, Vol.379, p.137705, Article 137705
Main Authors: Zhang, Jingyi, Zhang, Peiyu, Zhang, Wenqian, Tan, Shili, Zhou, Xin
Format: Article
Language:English
Subjects:
Grain evolution
Laser metal deposition
Melt pool
Single-crystal superalloy
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Summary:•Variations in melt-pool geometry affect both CET-related and OMT-related grain growth in LMD of a SX alloy.•Melt pool with large depth-to-height ratio contributes to obtain a multilayered component with quasi SX nature.•Melt pool with low depth-to-height ratio leads to a triangle-shaped columnar region with orientation alternatively changed. The effects of melt-pool geometry on grain structure evolution in the multilayer laser metal deposition of a single-crystal superalloy are analyzed. The spatiotemporal variations in geometrical features not only affect the grain growth patterns in each layer but also lead to different overlapping behaviors and resultant substrate conditions. The initial melt pool with a large depth-to-height ratio generally contributes to sustaining the continual epitaxial growth; otherwise, a triangle-shaped columnar region with grain orientation alternatively changed can be formed.
ISSN:0167-577X
DOI:10.1016/j.matlet.2024.137705