Mechanism of plastic deformation of a Ni-based superalloy for VHTR applications

Kun Mo; Gianfranco Lovicu; Xiang Chen; Hsiao Ming Tung; Jon B. Hansen; James F. Stubbins

doi:10.1016/j.jnucmat.2013.03.083

Mechanism of plastic deformation of a Ni-based superalloy for VHTR applications

Kun Mo, Gianfranco Lovicu, Xiang Chen, Hsiao Ming Tung, Jon B. Hansen, James F. Stubbins

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

50 Scopus citations

Abstract

Alloy 617 is considered a leading structural material for next generation nuclear power plants due to its good corrosion resistance and exceptional strength at high-temperatures. In the present work, a complementary study of deformation mechanisms in Alloy 617 was performed via tensile testing at temperatures up to 1000 °C. Dynamic strain aging characterized by serrated flow leading to temperature independent yield strength was observed at intermediate temperatures. At temperatures higher than 700 °C, the material's strength reduced dramatically as a result of the predominance of dislocation creep and dynamic recrystallization. The changes in deformation mechanisms were established by direct observations of Electron Backscatter Diffraction mappings and by the analysis of texture development based on the pole figure mappings. Recrystallized grains were found to preferentially grow in particle-rich areas and on high-angle grain boundaries. Finally, fracture was initiated from particle cracks at temperatures up to 700 °C and by triple junction cracks from 800 to 1000 °C.

Original language	English
Pages (from-to)	695-703
Number of pages	9
Journal	Journal of Nuclear Materials
Volume	441
Issue number	1-3
DOIs	https://doi.org/10.1016/j.jnucmat.2013.03.083
State	Published - 2013
Externally published	Yes

Funding

The work was supported by the US Department of Energy under Grants DE-FC07-07ID14819 and DOE NEUP 09-516 . The authors would like to thank Dr. Peter Kurath from the Advanced Materials Testing and Evaluation Laboratory of University of Illinois at Urbana-Champaign for technical assistance. The authors would also like to thank Haynes International, Inc. for providing testing materials. The microstructural analysis was carried out in part in the Frederick Seitz Materials Research Laboratory Central Facilities, University of Illinois, which are partially supported by the U.S. Department of Energy under Grants DE-FG02-07ER46453 and DE-FG02-07ER46471 .

Funders	Funder number
US Department of Energy	DE-FC07-07ID14819, DOE NEUP 09-516
U.S. Department of Energy	DE-FG02-07ER46453, DE-FG02-07ER46471

Access to Document

10.1016/j.jnucmat.2013.03.083

Cite this

@article{6d247004da0f4f0391efce23dd935a23,

title = "Mechanism of plastic deformation of a Ni-based superalloy for VHTR applications",

abstract = "Alloy 617 is considered a leading structural material for next generation nuclear power plants due to its good corrosion resistance and exceptional strength at high-temperatures. In the present work, a complementary study of deformation mechanisms in Alloy 617 was performed via tensile testing at temperatures up to 1000 °C. Dynamic strain aging characterized by serrated flow leading to temperature independent yield strength was observed at intermediate temperatures. At temperatures higher than 700 °C, the material's strength reduced dramatically as a result of the predominance of dislocation creep and dynamic recrystallization. The changes in deformation mechanisms were established by direct observations of Electron Backscatter Diffraction mappings and by the analysis of texture development based on the pole figure mappings. Recrystallized grains were found to preferentially grow in particle-rich areas and on high-angle grain boundaries. Finally, fracture was initiated from particle cracks at temperatures up to 700 °C and by triple junction cracks from 800 to 1000 °C.",

author = "Kun Mo and Gianfranco Lovicu and Xiang Chen and Tung, {Hsiao Ming} and Hansen, {Jon B.} and Stubbins, {James F.}",

year = "2013",

doi = "10.1016/j.jnucmat.2013.03.083",

language = "English",

volume = "441",

pages = "695--703",

journal = "Journal of Nuclear Materials",

issn = "0022-3115",

publisher = "Elsevier",

number = "1-3",

}

TY - JOUR

T1 - Mechanism of plastic deformation of a Ni-based superalloy for VHTR applications

AU - Mo, Kun

AU - Lovicu, Gianfranco

AU - Chen, Xiang

AU - Tung, Hsiao Ming

AU - Hansen, Jon B.

AU - Stubbins, James F.

PY - 2013

Y1 - 2013

N2 - Alloy 617 is considered a leading structural material for next generation nuclear power plants due to its good corrosion resistance and exceptional strength at high-temperatures. In the present work, a complementary study of deformation mechanisms in Alloy 617 was performed via tensile testing at temperatures up to 1000 °C. Dynamic strain aging characterized by serrated flow leading to temperature independent yield strength was observed at intermediate temperatures. At temperatures higher than 700 °C, the material's strength reduced dramatically as a result of the predominance of dislocation creep and dynamic recrystallization. The changes in deformation mechanisms were established by direct observations of Electron Backscatter Diffraction mappings and by the analysis of texture development based on the pole figure mappings. Recrystallized grains were found to preferentially grow in particle-rich areas and on high-angle grain boundaries. Finally, fracture was initiated from particle cracks at temperatures up to 700 °C and by triple junction cracks from 800 to 1000 °C.

AB - Alloy 617 is considered a leading structural material for next generation nuclear power plants due to its good corrosion resistance and exceptional strength at high-temperatures. In the present work, a complementary study of deformation mechanisms in Alloy 617 was performed via tensile testing at temperatures up to 1000 °C. Dynamic strain aging characterized by serrated flow leading to temperature independent yield strength was observed at intermediate temperatures. At temperatures higher than 700 °C, the material's strength reduced dramatically as a result of the predominance of dislocation creep and dynamic recrystallization. The changes in deformation mechanisms were established by direct observations of Electron Backscatter Diffraction mappings and by the analysis of texture development based on the pole figure mappings. Recrystallized grains were found to preferentially grow in particle-rich areas and on high-angle grain boundaries. Finally, fracture was initiated from particle cracks at temperatures up to 700 °C and by triple junction cracks from 800 to 1000 °C.

UR - http://www.scopus.com/inward/record.url?scp=84885177538&partnerID=8YFLogxK

U2 - 10.1016/j.jnucmat.2013.03.083

DO - 10.1016/j.jnucmat.2013.03.083

M3 - Article

AN - SCOPUS:84885177538

SN - 0022-3115

VL - 441

SP - 695

EP - 703

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

IS - 1-3

ER -

Mechanism of plastic deformation of a Ni-based superalloy for VHTR applications

Abstract

Funding

Access to Document

Other files and links

Fingerprint

Cite this