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The creep behavior of Hastelloy X fabricated by laser powder bed fusion was investigated, focusing on the testing temperatures of 700°C, 800°C, 900°C and 1000°C. For PiHA heat, the stress axis was parallel to the build direction, whereas for PiHC heat it was perpendicular. The creep strength of PiHA was similar to that of the conventional Hastelloy X at 700°C to 1000°C. The creep life of PiHC was one order of magnitude shorter than that of PiHA at 800°C and 900°C. For estimating allowable stress of additively manufactured Hastelloy X, the creep strength of PiHC will be minimum value. The creep ductility was much lower in PiHA and PiHC than in the conventional Hastelloy X at all testing temperatures. No large difference in creep ductility was observed between PiHA and PiHC. Double local minimum values of creep rate were recognized in creep rate versus time curves at 700°C and 800°C for PiHA and PiHC. Creep voids and cracks were observed at grain boundaries perpendicular to the stress axis in PiHA and PiHC. M23C6, µ phase, R phase and M6C particles were observed after creep exposure.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: Hastelloy X, Additive manufacturing, creep strength, creep deformation behavior, precipitates

Date published: 2025-12-31

Publisher: Informa UK Limited

Journal:

• Science and Technology of Advanced Materials: Methods (ISSN: 27660400) vol. 5 issue. 1 2582996

Funding:

• Amada Foundation AF-2022201-A3

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1080/27660400.2025.2582996

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Updated at: 2025-11-21 16:30:04 +0900

Published on MDR: 2025-11-21 16:23:46 +0900