High-temperature mechanical properties of a γ′-strengthened Co-based superalloy designed for additive manufacturing

Noah Holtham; Patxi Fernandez-Zelaia; Chris M. Fancher; Chris Ledford; Frank Brinkley; Dunji Yu; Ke An; Ning Zhou; Stéphane Forsik; Tresa Pollock; Michael Kirka

doi:10.1016/j.scriptamat.2026.117369

High-temperature mechanical properties of a γ′-strengthened Co-based superalloy designed for additive manufacturing

Noah Holtham
, Patxi Fernandez-Zelaia
, Chris M. Fancher
, Chris Ledford
, Frank Brinkley
, Dunji Yu
, Ke An
, Ning Zhou
, Stéphane Forsik
, Tresa Pollock
, Michael Kirka

Research output: Contribution to journal › Article › peer-review

Abstract

GammaPrint®-700 GammaPrint is a registered trademark of CRS Holdings, LLC., a subsidiary of Carpenter Technology Corporation. is a recently developed high γ′ (∼70% volume fraction) CoNi-based superalloy designed to combine high-temperature mechanical performance with laser powder bed fusion processability. Room-temperature yield strength ranged from 610 to 658 MPa and increased to 661 MPa (longitudinal) and 730 MPa (transverse) at 760 °C. The creep behavior compared favorably to high-γ′ Ni-based superalloys manufactured via laser powder bed fusion such as Incoloy® 939 and Inconel® 738LC. Incoloy® and Inconel® are registered trademarks of Huntington Alloys Corporation. In-situ neutron diffraction data measured during creep revealed that plastic deformation was largely localized to the γ phase at 760 °C, allowing the γ’ phase to elastically compensate and maintain creep strain resistance. However, at 900 °C, this load sharing behavior was weakened, contributing to accelerated creep rate and rupture.

Original language	English
Article number	117369
Journal	Scripta Materialia
Volume	281
DOIs	https://doi.org/10.1016/j.scriptamat.2026.117369
State	Published - Aug 1 2026

Funding

A portion of this research was sponsored by the US Department of Energy, Office of Energy Efficiency and Renewable Energy, Advanced Manufacturing Office, under contract DE-AC05-00OR22725 with UT-Battelle, LLC and performed in partiality at the Oak Ridge National Laboratory’s Manufacturing Demonstration Facility, an Office of Energy Efficiency and Renewable Energy user facility. This work was additionally supported by the US Department of Energy, National Nuclear Security Administration, under award number DE-NA0004152. A portion of this research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory. The beam time was allocated to VULCAN on proposal number IPTS-29510.1. The research reported here also made use of shared facilities of the National Science Foundation (NSF) Materials Research Science and Engineering Center (MRSEC) at UC Santa Barbara, DMR-172025. The UC Santa Barbara MRSEC is a member of the Materials Research Facilities Network ( www.mrfn.org ). GammaPrint-700 is a patented alloy of UC Santa Barbara (patent US 11,725,263 B2) manufactured under license by Carpenter Technology Corporation. A portion of this research was sponsored by the US Department of Energy, Office of Energy Efficiency and Renewable Energy, Advanced Manufacturing Office, under contract DE-AC05-00OR22725 with UT-Battelle, LLC and performed in partiality at the Oak Ridge National Laboratory's Manufacturing Demonstration Facility, an Office of Energy Efficiency and Renewable Energy user facility. This work was additionally supported by the US Department of Energy, National Nuclear Security Administration, under award number DE-NA0004152. A portion of this research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory. The beam time was allocated to VULCAN on proposal number IPTS-29510.1. The research reported here also made use of shared facilities of the National Science Foundation (NSF) Materials Research Science and Engineering Center (MRSEC) at UC Santa Barbara, DMR-172025. The UC Santa Barbara MRSEC is a member of the Materials Research Facilities Network (www.mrfn.org). GammaPrint-700 is a patented alloy of UC Santa Barbara (patent US 11,725,263 B2) manufactured under license by Carpenter Technology Corporation. Notice: This manuscript has been authored by UT-Battelle, LLC, under contract DE-AC05-00OR22725 with the US Department of Energy (DOE). The US government retains and the publisher, by accepting the article for publication, acknowledges that the US government retains a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for US government purposes. DOE will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan ( https://www.energy.gov/doe-public-access-plan ).

Keywords

Creep
High temperature deformation
Neutron diffraction
Superalloy

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10.1016/j.scriptamat.2026.117369

Cite this

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title = "High-temperature mechanical properties of a γ′-strengthened Co-based superalloy designed for additive manufacturing",

abstract = "GammaPrint{\textregistered}-700 GammaPrint is a registered trademark of CRS Holdings, LLC., a subsidiary of Carpenter Technology Corporation. is a recently developed high γ′ (∼70\% volume fraction) CoNi-based superalloy designed to combine high-temperature mechanical performance with laser powder bed fusion processability. Room-temperature yield strength ranged from 610 to 658 MPa and increased to 661 MPa (longitudinal) and 730 MPa (transverse) at 760 °C. The creep behavior compared favorably to high-γ′ Ni-based superalloys manufactured via laser powder bed fusion such as Incoloy{\textregistered} 939 and Inconel{\textregistered} 738LC. Incoloy{\textregistered} and Inconel{\textregistered} are registered trademarks of Huntington Alloys Corporation. In-situ neutron diffraction data measured during creep revealed that plastic deformation was largely localized to the γ phase at 760 °C, allowing the γ{\textquoteright} phase to elastically compensate and maintain creep strain resistance. However, at 900 °C, this load sharing behavior was weakened, contributing to accelerated creep rate and rupture.",

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author = "Noah Holtham and Patxi Fernandez-Zelaia and Fancher, \{Chris M.\} and Chris Ledford and Frank Brinkley and Dunji Yu and Ke An and Ning Zhou and St{\'e}phane Forsik and Tresa Pollock and Michael Kirka",

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year = "2026",

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doi = "10.1016/j.scriptamat.2026.117369",

language = "English",

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AU - Holtham, Noah

AU - Fernandez-Zelaia, Patxi

AU - Fancher, Chris M.

AU - Ledford, Chris

AU - Brinkley, Frank

AU - Yu, Dunji

AU - An, Ke

AU - Zhou, Ning

AU - Forsik, Stéphane

AU - Pollock, Tresa

AU - Kirka, Michael

PY - 2026/8/1

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N2 - GammaPrint®-700 GammaPrint is a registered trademark of CRS Holdings, LLC., a subsidiary of Carpenter Technology Corporation. is a recently developed high γ′ (∼70% volume fraction) CoNi-based superalloy designed to combine high-temperature mechanical performance with laser powder bed fusion processability. Room-temperature yield strength ranged from 610 to 658 MPa and increased to 661 MPa (longitudinal) and 730 MPa (transverse) at 760 °C. The creep behavior compared favorably to high-γ′ Ni-based superalloys manufactured via laser powder bed fusion such as Incoloy® 939 and Inconel® 738LC. Incoloy® and Inconel® are registered trademarks of Huntington Alloys Corporation. In-situ neutron diffraction data measured during creep revealed that plastic deformation was largely localized to the γ phase at 760 °C, allowing the γ’ phase to elastically compensate and maintain creep strain resistance. However, at 900 °C, this load sharing behavior was weakened, contributing to accelerated creep rate and rupture.

AB - GammaPrint®-700 GammaPrint is a registered trademark of CRS Holdings, LLC., a subsidiary of Carpenter Technology Corporation. is a recently developed high γ′ (∼70% volume fraction) CoNi-based superalloy designed to combine high-temperature mechanical performance with laser powder bed fusion processability. Room-temperature yield strength ranged from 610 to 658 MPa and increased to 661 MPa (longitudinal) and 730 MPa (transverse) at 760 °C. The creep behavior compared favorably to high-γ′ Ni-based superalloys manufactured via laser powder bed fusion such as Incoloy® 939 and Inconel® 738LC. Incoloy® and Inconel® are registered trademarks of Huntington Alloys Corporation. In-situ neutron diffraction data measured during creep revealed that plastic deformation was largely localized to the γ phase at 760 °C, allowing the γ’ phase to elastically compensate and maintain creep strain resistance. However, at 900 °C, this load sharing behavior was weakened, contributing to accelerated creep rate and rupture.

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KW - High temperature deformation

KW - Neutron diffraction

KW - Superalloy

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DO - 10.1016/j.scriptamat.2026.117369

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SN - 1359-6462

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JO - Scripta Materialia

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ER -

High-temperature mechanical properties of a γ′-strengthened Co-based superalloy designed for additive manufacturing

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