γ″ variant-sensitive deformation behaviour of Inconel 718 superalloy

R.Y. Zhang; H.L. Qin; Z.N. Bi; Y.T. Tang; J. Araújo de Oliveira; T.L. Lee; C. Panwisawas; S.Y. Zhang; J. Zhang; J. Li; H.B. Dong

doi:10.1016/j.jmst.2022.03.018

γ″ variant-sensitive deformation behaviour of Inconel 718 superalloy

R.Y. Zhang^*, H.L. Qin, Z.N. Bi, Y.T. Tang, J. Araújo de Oliveira, T.L. Lee, C. Panwisawas, S.Y. Zhang, J. Zhang, J. Li, H.B. Dong^*

^*Corresponding author for this work

Metallurgy and Materials

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

Abstract

Strengthening in Inconel 718 superalloy is derived from dislocation interaction with γ″ precipitates, which exist in disk-shaped three possible orientation variants with their {100} habit plane normal to each other. The interactions between dislocations and γ″ precipitates vary according to the γ″ orientation variants, which makes the deformation behaviour complicated and difficult to reveal experimentally. In this work, γ″ variant distributions of Inconel 718 samples were tailored by ageing heat treatment under either tensile or compressive stress. The γ″ variant-sensitive deformation behaviours were then studied by in situ tensile tests via neutron diffraction at room temperature. It is demonstrated that yielding first takes place in grains oriented with <110> parallel to the loading direction. An identical lattice strain response to applied stress of both the γ matrix and the γ″ precipitates was observed during yielding, suggesting that dislocations shearing through the γ″ precipitates is predominant at this stage. Variations in yield strength for samples with different γ″ variant distributions were observed, which can be attributed to different strengthening that arises from interactions between dislocation and different γ″ variants.

Original language	English
Pages (from-to)	169-181
Number of pages	13
Journal	Journal of Materials Science & Technology
Volume	126
Early online date	23 Apr 2022
DOIs	https://doi.org/10.1016/j.jmst.2022.03.018
Publication status	Published - 1 Nov 2022

Bibliographical note

Acknowledgments:
Ruiyao Zhang gratefully acknowledges the support from the Guangdong Introducing Innovative and Entrepreneurial Teams (No. 2016ZT06G025) and the financial support from the Centre for Doctoral Training in Innovative Metal Processing (IMPaCT) funded by the UK Engineering and Physical Sciences Research Council (EPSRC, No. EP/L016206/1). The authors also acknowledge useful discussions by Dr. Xingzhong Liang and the allocation of beam time (RB1820207) at ENGIN-X, ISIS, Rutherford Appleton Laboratory. Chinnapat Panwisawas would like to acknowledge the funding from Innovation Fellowship by EPSRC, UK Research and Innovation (UKRI, No. EP/S000828/2). Shuyan Zhang gratefully acknowledges the support from the Guangdong Major Project of Basic and Applied Basic Research (No. 2020B0301030001) and the Strategic Priority Research Program of the Chinese Academy of Sciences (No. XDC04000000).

Keywords

Ni-base superalloys
Precipitation strengthening
Neutron diffraction
Lattice strains
Plastic deformation

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10.1016/j.jmst.2022.03.018

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@article{72ed08c42f8048689bc33f9efc2dcd5a,

title = "γ″ variant-sensitive deformation behaviour of Inconel 718 superalloy",

abstract = "Strengthening in Inconel 718 superalloy is derived from dislocation interaction with γ″ precipitates, which exist in disk-shaped three possible orientation variants with their {100} habit plane normal to each other. The interactions between dislocations and γ″ precipitates vary according to the γ″ orientation variants, which makes the deformation behaviour complicated and difficult to reveal experimentally. In this work, γ″ variant distributions of Inconel 718 samples were tailored by ageing heat treatment under either tensile or compressive stress. The γ″ variant-sensitive deformation behaviours were then studied by in situ tensile tests via neutron diffraction at room temperature. It is demonstrated that yielding first takes place in grains oriented with <110> parallel to the loading direction. An identical lattice strain response to applied stress of both the γ matrix and the γ″ precipitates was observed during yielding, suggesting that dislocations shearing through the γ″ precipitates is predominant at this stage. Variations in yield strength for samples with different γ″ variant distributions were observed, which can be attributed to different strengthening that arises from interactions between dislocation and different γ″ variants.",

keywords = "Ni-base superalloys, Precipitation strengthening, Neutron diffraction, Lattice strains, Plastic deformation",

author = "R.Y. Zhang and H.L. Qin and Z.N. Bi and Y.T. Tang and {de Oliveira}, {J. Ara{\'u}jo} and T.L. Lee and C. Panwisawas and S.Y. Zhang and J. Zhang and J. Li and H.B. Dong",

note = "Acknowledgments: Ruiyao Zhang gratefully acknowledges the support from the Guangdong Introducing Innovative and Entrepreneurial Teams (No. 2016ZT06G025) and the financial support from the Centre for Doctoral Training in Innovative Metal Processing (IMPaCT) funded by the UK Engineering and Physical Sciences Research Council (EPSRC, No. EP/L016206/1). The authors also acknowledge useful discussions by Dr. Xingzhong Liang and the allocation of beam time (RB1820207) at ENGIN-X, ISIS, Rutherford Appleton Laboratory. Chinnapat Panwisawas would like to acknowledge the funding from Innovation Fellowship by EPSRC, UK Research and Innovation (UKRI, No. EP/S000828/2). Shuyan Zhang gratefully acknowledges the support from the Guangdong Major Project of Basic and Applied Basic Research (No. 2020B0301030001) and the Strategic Priority Research Program of the Chinese Academy of Sciences (No. XDC04000000).",

year = "2022",

month = nov,

day = "1",

doi = "10.1016/j.jmst.2022.03.018",

language = "English",

volume = "126",

pages = "169--181",

journal = "Journal of Materials Science & Technology",

issn = "1005-0302",

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T1 - γ″ variant-sensitive deformation behaviour of Inconel 718 superalloy

AU - Zhang, R.Y.

AU - Qin, H.L.

AU - Bi, Z.N.

AU - Tang, Y.T.

AU - de Oliveira, J. Araújo

AU - Lee, T.L.

AU - Panwisawas, C.

AU - Zhang, S.Y.

AU - Zhang, J.

AU - Li, J.

AU - Dong, H.B.

N1 - Acknowledgments: Ruiyao Zhang gratefully acknowledges the support from the Guangdong Introducing Innovative and Entrepreneurial Teams (No. 2016ZT06G025) and the financial support from the Centre for Doctoral Training in Innovative Metal Processing (IMPaCT) funded by the UK Engineering and Physical Sciences Research Council (EPSRC, No. EP/L016206/1). The authors also acknowledge useful discussions by Dr. Xingzhong Liang and the allocation of beam time (RB1820207) at ENGIN-X, ISIS, Rutherford Appleton Laboratory. Chinnapat Panwisawas would like to acknowledge the funding from Innovation Fellowship by EPSRC, UK Research and Innovation (UKRI, No. EP/S000828/2). Shuyan Zhang gratefully acknowledges the support from the Guangdong Major Project of Basic and Applied Basic Research (No. 2020B0301030001) and the Strategic Priority Research Program of the Chinese Academy of Sciences (No. XDC04000000).

PY - 2022/11/1

Y1 - 2022/11/1

N2 - Strengthening in Inconel 718 superalloy is derived from dislocation interaction with γ″ precipitates, which exist in disk-shaped three possible orientation variants with their {100} habit plane normal to each other. The interactions between dislocations and γ″ precipitates vary according to the γ″ orientation variants, which makes the deformation behaviour complicated and difficult to reveal experimentally. In this work, γ″ variant distributions of Inconel 718 samples were tailored by ageing heat treatment under either tensile or compressive stress. The γ″ variant-sensitive deformation behaviours were then studied by in situ tensile tests via neutron diffraction at room temperature. It is demonstrated that yielding first takes place in grains oriented with <110> parallel to the loading direction. An identical lattice strain response to applied stress of both the γ matrix and the γ″ precipitates was observed during yielding, suggesting that dislocations shearing through the γ″ precipitates is predominant at this stage. Variations in yield strength for samples with different γ″ variant distributions were observed, which can be attributed to different strengthening that arises from interactions between dislocation and different γ″ variants.

AB - Strengthening in Inconel 718 superalloy is derived from dislocation interaction with γ″ precipitates, which exist in disk-shaped three possible orientation variants with their {100} habit plane normal to each other. The interactions between dislocations and γ″ precipitates vary according to the γ″ orientation variants, which makes the deformation behaviour complicated and difficult to reveal experimentally. In this work, γ″ variant distributions of Inconel 718 samples were tailored by ageing heat treatment under either tensile or compressive stress. The γ″ variant-sensitive deformation behaviours were then studied by in situ tensile tests via neutron diffraction at room temperature. It is demonstrated that yielding first takes place in grains oriented with <110> parallel to the loading direction. An identical lattice strain response to applied stress of both the γ matrix and the γ″ precipitates was observed during yielding, suggesting that dislocations shearing through the γ″ precipitates is predominant at this stage. Variations in yield strength for samples with different γ″ variant distributions were observed, which can be attributed to different strengthening that arises from interactions between dislocation and different γ″ variants.

KW - Ni-base superalloys

KW - Precipitation strengthening

KW - Neutron diffraction

KW - Lattice strains

KW - Plastic deformation

U2 - 10.1016/j.jmst.2022.03.018

DO - 10.1016/j.jmst.2022.03.018

M3 - Article

SN - 1005-0302

VL - 126

SP - 169

EP - 181

JO - Journal of Materials Science & Technology

JF - Journal of Materials Science & Technology

ER -

γ″ variant-sensitive deformation behaviour of Inconel 718 superalloy

Abstract

Bibliographical note

Keywords

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