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Journal of Materials Engineering and Performance

Published in:

22-06-2020

Spheroidization Mechanism of Lamellar δ Phase in Inconel 718 during Delta Processing

Authors: Hong-yan Gan, Ming Cheng, Zhen-xing Guo, Qing-an Tai, Grazhina Kozhevnikova, Hong-wu Song, Shi-hong Zhang

Published in: Journal of Materials Engineering and Performance | Issue 6/2020

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Abstract

The morphology evolution of lamellar δ phase in Inconel 718 during Delta Processing was characterized by scanning electron microscopy, electron backscatter diffraction, and transmission electron microscopy. A spheroidization mechanism is proposed for transformation of the lamellar δ phase. The results showed that lamellar δ phase hindered the movement of dislocations, which led to a dislocation aggregation zone around the fracture location of the δ phase. Strain in the region thus increased, which promoted the occurrence of dynamic recrystallization and fracture of the lamellar δ phase. A diffusion channel for Nb atoms was simultaneously provided by the high-density dislocations, which led to dissolution and reduction in the amount of δ phase. Under the combined action of deformation, fracture, and dissolution, the lamellar δ phase gradually transformed into granular short rods and spheroids.

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Title: Spheroidization Mechanism of Lamellar δ Phase in Inconel 718 during Delta Processing
Authors: Hong-yan Gan
Ming Cheng
Zhen-xing Guo
Qing-an Tai
Grazhina Kozhevnikova
Hong-wu Song
Shi-hong Zhang
Publication date: 22-06-2020
Publisher: Springer US
Published in: Journal of Materials Engineering and Performance / Issue 6/2020
Print ISSN: 1059-9495
Electronic ISSN: 1544-1024
DOI: https://doi.org/10.1007/s11665-020-04909-4

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