Effect of heterogeneous microstructure on the tensile and creep performances of cast Haynes 282 alloy

Ling Wang; Keyou Mao; Peter F. Tortorelli; Philip J. Maziasz; Mani Thangirala; Kinga A. Unocic; Xiang Frank Chen

doi:10.1016/j.msea.2021.142099

Effect of heterogeneous microstructure on the tensile and creep performances of cast Haynes 282 alloy

Ling Wang, Keyou Mao, Peter F. Tortorelli, Philip J. Maziasz, Mani Thangirala, Kinga A. Unocic, Xiang Frank Chen

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

10 Scopus citations

Abstract

Precipitation-strengthened Ni-based superalloys are leading candidate materials for advanced ultra-supercritical (A-USC) plants with steam conditions up to 760 °C (1400 °F) and 35 MPa (5 ksi). This study evaluates representative specimens from a large casting of Haynes 282 to study the effect of microstructural heterogeneity on the mechanical behavior of this alloy. The tensile test results of cast Haynes 282 over the temperature range 20–816 °C exhibited lower tensile strength and ductility in comparison with the reference wrought Haynes 282. However, the creep rupture tests of the cast alloy below 704–788 °C and 190–431 MPa presented a similar stress-Larson-Miller parameter to that of the wrought material. Microstructural and dislocation characterizations using scanning electron microscopy, conventional transmission electron microscopy, and scanning transmission electron microscopy in conjunction with energy dispersive X-ray spectroscopy were performed to understand the microstructural evolution before and after the mechanical tests. The heterogeneous microstructures of the cast Haynes 282 material, including the coarse grains, potential casting defects, and a bimodal size distribution of γ′ precipitates, were detrimental to the tensile behavior, whereas the coarse-scale grains had a positive effect on the creep performance because diffusional creep was the dominant creep mechanism.

Original language	English
Article number	142099
Journal	Materials Science and Engineering: A
Volume	828
DOIs	https://doi.org/10.1016/j.msea.2021.142099
State	Published - Nov 2 2021

Funding

This project is sponsored by the U.S. Department of Energy (DOE) , Office of Fossil Energy, Crosscutting Research, High Performance Materials Program , under contract DE-AC05-00OR22725 with Oak Ridge National Laboratory (ORNL) managed by UT Battelle, LLC. Microscopy research was performed, in part, using instrumentation (FEI Talos F200X S/TEM) provided by the U.S. DOE, Office of Nuclear Energy, Fuel Cycle R&D Program , and the Nuclear Science User Facilities . We are grateful to M. Fasouletos, S. Nathan, and B. White from National Energy Technology Laboratory (NETL) for programmatic support. We also would like to thank T. Geer, T. Lowe, and D. Stringfield from ORNL for their technical assistance. This manuscript has been authored by UT-Battelle, LLC, under contract No. DE-AC05-00OR22725 with the U.S. Department of Energy (DOE). The U.S. government retains and the publisher, by accepting the article for publication, acknowledges that the U.S. 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 U.S. government purposes. DOE will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan ( http://energy.gov/downloads/doe-public-access-plan ).

Keywords

Cast haynes 282
Creep mechanism
Dislocation microstructure
Ni-based superalloy
Tensile testing
γ′ precipitates

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10.1016/j.msea.2021.142099

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title = "Effect of heterogeneous microstructure on the tensile and creep performances of cast Haynes 282 alloy",

abstract = "Precipitation-strengthened Ni-based superalloys are leading candidate materials for advanced ultra-supercritical (A-USC) plants with steam conditions up to 760 °C (1400 °F) and 35 MPa (5 ksi). This study evaluates representative specimens from a large casting of Haynes 282 to study the effect of microstructural heterogeneity on the mechanical behavior of this alloy. The tensile test results of cast Haynes 282 over the temperature range 20–816 °C exhibited lower tensile strength and ductility in comparison with the reference wrought Haynes 282. However, the creep rupture tests of the cast alloy below 704–788 °C and 190–431 MPa presented a similar stress-Larson-Miller parameter to that of the wrought material. Microstructural and dislocation characterizations using scanning electron microscopy, conventional transmission electron microscopy, and scanning transmission electron microscopy in conjunction with energy dispersive X-ray spectroscopy were performed to understand the microstructural evolution before and after the mechanical tests. The heterogeneous microstructures of the cast Haynes 282 material, including the coarse grains, potential casting defects, and a bimodal size distribution of γ′ precipitates, were detrimental to the tensile behavior, whereas the coarse-scale grains had a positive effect on the creep performance because diffusional creep was the dominant creep mechanism.",

keywords = "Cast haynes 282, Creep mechanism, Dislocation microstructure, Ni-based superalloy, Tensile testing, γ′ precipitates",

author = "Ling Wang and Keyou Mao and Tortorelli, {Peter F.} and Maziasz, {Philip J.} and Mani Thangirala and Unocic, {Kinga A.} and Chen, {Xiang Frank}",

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AU - Mao, Keyou

AU - Tortorelli, Peter F.

AU - Maziasz, Philip J.

AU - Thangirala, Mani

AU - Unocic, Kinga A.

AU - Chen, Xiang Frank

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N2 - Precipitation-strengthened Ni-based superalloys are leading candidate materials for advanced ultra-supercritical (A-USC) plants with steam conditions up to 760 °C (1400 °F) and 35 MPa (5 ksi). This study evaluates representative specimens from a large casting of Haynes 282 to study the effect of microstructural heterogeneity on the mechanical behavior of this alloy. The tensile test results of cast Haynes 282 over the temperature range 20–816 °C exhibited lower tensile strength and ductility in comparison with the reference wrought Haynes 282. However, the creep rupture tests of the cast alloy below 704–788 °C and 190–431 MPa presented a similar stress-Larson-Miller parameter to that of the wrought material. Microstructural and dislocation characterizations using scanning electron microscopy, conventional transmission electron microscopy, and scanning transmission electron microscopy in conjunction with energy dispersive X-ray spectroscopy were performed to understand the microstructural evolution before and after the mechanical tests. The heterogeneous microstructures of the cast Haynes 282 material, including the coarse grains, potential casting defects, and a bimodal size distribution of γ′ precipitates, were detrimental to the tensile behavior, whereas the coarse-scale grains had a positive effect on the creep performance because diffusional creep was the dominant creep mechanism.

AB - Precipitation-strengthened Ni-based superalloys are leading candidate materials for advanced ultra-supercritical (A-USC) plants with steam conditions up to 760 °C (1400 °F) and 35 MPa (5 ksi). This study evaluates representative specimens from a large casting of Haynes 282 to study the effect of microstructural heterogeneity on the mechanical behavior of this alloy. The tensile test results of cast Haynes 282 over the temperature range 20–816 °C exhibited lower tensile strength and ductility in comparison with the reference wrought Haynes 282. However, the creep rupture tests of the cast alloy below 704–788 °C and 190–431 MPa presented a similar stress-Larson-Miller parameter to that of the wrought material. Microstructural and dislocation characterizations using scanning electron microscopy, conventional transmission electron microscopy, and scanning transmission electron microscopy in conjunction with energy dispersive X-ray spectroscopy were performed to understand the microstructural evolution before and after the mechanical tests. The heterogeneous microstructures of the cast Haynes 282 material, including the coarse grains, potential casting defects, and a bimodal size distribution of γ′ precipitates, were detrimental to the tensile behavior, whereas the coarse-scale grains had a positive effect on the creep performance because diffusional creep was the dominant creep mechanism.

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Effect of heterogeneous microstructure on the tensile and creep performances of cast Haynes 282 alloy

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