Investigation of the mechanical anisotropy of the hot isostatic pressing Mar-M247 produced via laser powder bed fusion (LPBF): a perspective on grain characteristics

Investigation of the mechanical anisotropy of the hot isostatic pressing Mar-M247 produced via laser powder bed fusion (LPBF): a perspective on grain characteristics

The anisotropy in mechanical properties of additively manufactured (AM) superalloys, closely related to grain morphology, grain boundaries, and precipitated phases, impedes their aerospace applications. In this study, the influence of grain characteristics on the mechanical anisotropy of HIP (hot is...

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Bibliographic Details
Main Authors: Lei Shi, Guodong Niu, Yuanguo Tan, Liming Lei, Jingjing Liang
Format: Article
Language:English
Published: IOP Publishing 2025-01-01
Series:Materials Research Express
Subjects:
Mar-M247 superalloy
LPBF
hot isostatic pressing
anisotropy
mechanical properties
Online Access:https://doi.org/10.1088/2053-1591/add650
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Summary:The anisotropy in mechanical properties of additively manufactured (AM) superalloys, closely related to grain morphology, grain boundaries, and precipitated phases, impedes their aerospace applications. In this study, the influence of grain characteristics on the mechanical anisotropy of HIP (hot isostatic pressing)/HT(heat treatment) LPBF (laser powder bed fusion) Mar-M247 superalloy was investigated via experimental and finite element (FE) simulation methods. The results indicate that the mechanical properties along the build direction (XZ plane) are superior to those perpendicular to it (XY plane) at multiple temperatures. Particularly, the elongation along the build direction is nearly twice that perpendicular to it. HIP treatment effectively eliminates cracks in the alloy. Grain characteristics reveal columnar grains along the build direction and equiaxed grains perpendicular to it. The Representative Volume Element (RVE) results and the fracture analysis results show that columnar grains exhibit uniform stress distribution, resulting in higher elongation and crack initiation within grains, whereas equiaxed grains show stress concentration at triple junction boundaries, leading to crack initiation and alloy fracture.
ISSN:2053-1591

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