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Title: Correlation of Microstructure to Creep Response of Hot Isostatically Pressed and Aged Electron Beam Melted Inconel 718

Abstract

In this paper, creep rupture samples were fabricated by additive manufacturing (AM) via electron beam melting (EBM) to study the effects of grain morphology (equiaxed/columnar grains) and loading direction (longitudinal/transverse) with respect to build direction on creep deformation at 923 K (650 °C) with applied stresses of 580 and 600 MPa. The observed minimum creep rates and creep rupture lives of EBM Inconel 718 after post-processing by hot isostatic pressing (HIP) were found to be comparable to wrought material. The material with equiaxed grains exhibited low creep strain (2 pct) and short creep lifetimes (800 hours), whereas longer times (approximately 4500 hours) and high creep strain (up to 23 pct) were observed for material with columnar grains. The high stress exponent (n > 14) reflected the resistance to dislocation motion by γ” particles during creep. A precipitate-free zone (PFZ) was observed around the grain boundary δ phase. Creep damage occurred as voids and cracks in the PFZ. Finally, optimal post-processing of EBM Inconel 718 material should be explored to prevent δ phase embrittlement.

Authors:
 [1];  [2];  [2];  [3];  [3];  [3]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Manufacturing Demonstration Facility
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division. Manufacturing Demonstration Facility
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Advanced Manufacturing Office (EE-5A)
OSTI Identifier:
1474675
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science
Additional Journal Information:
Journal Volume: 49; Journal Issue: 10; Journal ID: ISSN 1073-5623
Publisher:
ASM International
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 42 ENGINEERING

Citation Formats

Shassere, Benjamin, Greeley, Duncan, Okello, Alfred, Kirka, Michael, Nandwana, Peeyush, and Dehoff, Ryan. Correlation of Microstructure to Creep Response of Hot Isostatically Pressed and Aged Electron Beam Melted Inconel 718. United States: N. p., 2018. Web. doi:10.1007/s11661-018-4812-z.
Shassere, Benjamin, Greeley, Duncan, Okello, Alfred, Kirka, Michael, Nandwana, Peeyush, & Dehoff, Ryan. Correlation of Microstructure to Creep Response of Hot Isostatically Pressed and Aged Electron Beam Melted Inconel 718. United States. doi:10.1007/s11661-018-4812-z.
Shassere, Benjamin, Greeley, Duncan, Okello, Alfred, Kirka, Michael, Nandwana, Peeyush, and Dehoff, Ryan. Mon . "Correlation of Microstructure to Creep Response of Hot Isostatically Pressed and Aged Electron Beam Melted Inconel 718". United States. doi:10.1007/s11661-018-4812-z. https://www.osti.gov/servlets/purl/1474675.
@article{osti_1474675,
title = {Correlation of Microstructure to Creep Response of Hot Isostatically Pressed and Aged Electron Beam Melted Inconel 718},
author = {Shassere, Benjamin and Greeley, Duncan and Okello, Alfred and Kirka, Michael and Nandwana, Peeyush and Dehoff, Ryan},
abstractNote = {In this paper, creep rupture samples were fabricated by additive manufacturing (AM) via electron beam melting (EBM) to study the effects of grain morphology (equiaxed/columnar grains) and loading direction (longitudinal/transverse) with respect to build direction on creep deformation at 923 K (650 °C) with applied stresses of 580 and 600 MPa. The observed minimum creep rates and creep rupture lives of EBM Inconel 718 after post-processing by hot isostatic pressing (HIP) were found to be comparable to wrought material. The material with equiaxed grains exhibited low creep strain (2 pct) and short creep lifetimes (800 hours), whereas longer times (approximately 4500 hours) and high creep strain (up to 23 pct) were observed for material with columnar grains. The high stress exponent (n > 14) reflected the resistance to dislocation motion by γ” particles during creep. A precipitate-free zone (PFZ) was observed around the grain boundary δ phase. Creep damage occurred as voids and cracks in the PFZ. Finally, optimal post-processing of EBM Inconel 718 material should be explored to prevent δ phase embrittlement.},
doi = {10.1007/s11661-018-4812-z},
journal = {Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science},
number = 10,
volume = 49,
place = {United States},
year = {2018},
month = {7}
}

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Works referenced in this record:

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The Inhibition of Diffusion Creep by Precipitates
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Microstructure Development in Electron Beam-Melted Inconel 718 and Associated Tensile Properties
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γ″-Ni3Nb precipitate in Fe–Ni base alloy
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Strategy for Texture Management in Metals Additive Manufacturing
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The effect of grain boundary precipitates on the creep behavior of Inconel 718
journal, June 1994


The back stress concept in power law creep of metals: A review
journal, October 1987


Effects of build direction and heat treatment on creep properties of Ni-base superalloy built up by additive manufacturing
journal, March 2017


Dependence of Creep Fracture of Inconel 718 on Grain Boundary Precipitates
journal, July 1997


Heterogeneous Creep Deformations and Correlation to Microstructures in Fe-30Cr-3Al Alloys Strengthened by an Fe2Nb Laves Phase
journal, August 2017

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Delta phase precipitation in Inconel 718
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δ Phase precipitation in Inconel 718 and associated mechanical properties
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Influence of Grain Boundary Character on Creep Void Formation in Alloy 617
journal, September 2009

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A study of back stress during creep deformation of a superalloy inconel 718
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Cavitation in creep
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Mechanical behavior of post-processed Inconel 718 manufactured through the electron beam melting process
journal, January 2017


Creep deformation mechanisms in modified 9Cr–1Mo steel
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Theoretical and practical implications of creep curve shape analyses for 2124 and 2419
journal, June 2004


Microstructures and mechanical behavior of Inconel 718 fabricated by selective laser melting
journal, March 2012


Thermal effects on microstructural heterogeneity of Inconel 718 materials fabricated by electron beam melting
journal, July 2014

  • Sames, William J.; Unocic, Kinga A.; Dehoff, Ryan R.
  • Journal of Materials Research, Vol. 29, Issue 17
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The transition from dislocation climb to viscous glide in creep of solid solution alloys
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Effect of standard heat treatment on the microstructure and mechanical properties of hot isostatically pressed superalloy inconel 718
journal, August 2003


Toward Improving the Type IV Cracking Resistance in Cr-Mo Steel Weld Through Thermo-Mechanical Processing
journal, February 2016

  • Shassere, Benjamin A.; Yamamoto, Yukinori; Babu, Sudarsanam Suresh
  • Metallurgical and Materials Transactions A, Vol. 47, Issue 5
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On the mechanism of the inhibition of diffusional creep by second phase particles
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Intergranular fracture during power-law creep
journal, September 1979


Rationalization of Microstructure Heterogeneity in INCONEL 718 Builds Made by the Direct Laser Additive Manufacturing Process
journal, June 2014

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Interaction Of Grain Boundary Dislocations With Precipitates During High Temperature Creep
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Welding of Inconel Alloy 718: A Historical Overview
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Creep and Creep-Rupture Behavior of Alloy 718
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    Works referencing / citing this record:

    Denuded zones, diffusional creep, and grain boundary sliding
    journal, February 2002

    • Wadsworth, Jeffrey; Ruano, Oscar A.; Sherby, Oleg D.
    • Metallurgical and Materials Transactions A, Vol. 33, Issue 2
    • DOI: 10.1007/s11661-002-0084-7

    Theoretical and practical implications of creep curve shape analyses for 2124 and 2419
    journal, June 2004


    Influence of Grain Boundary Character on Creep Void Formation in Alloy 617
    journal, September 2009

    • Lillo, Thomas; Cole, James; Frary, Megan
    • Metallurgical and Materials Transactions A, Vol. 40, Issue 12
    • DOI: 10.1007/s11661-009-0051-7

    Rationalization of Microstructure Heterogeneity in INCONEL 718 Builds Made by the Direct Laser Additive Manufacturing Process
    journal, June 2014

    • Tian, Yuan; McAllister, Donald; Colijn, Hendrik
    • Metallurgical and Materials Transactions A, Vol. 45, Issue 10
    • DOI: 10.1007/s11661-014-2370-6

    Toward Improving the Type IV Cracking Resistance in Cr-Mo Steel Weld Through Thermo-Mechanical Processing
    journal, February 2016

    • Shassere, Benjamin A.; Yamamoto, Yukinori; Babu, Sudarsanam Suresh
    • Metallurgical and Materials Transactions A, Vol. 47, Issue 5
    • DOI: 10.1007/s11661-016-3387-9

    Heterogeneous Creep Deformations and Correlation to Microstructures in Fe-30Cr-3Al Alloys Strengthened by an Fe2Nb Laves Phase
    journal, August 2017

    • Shassere, Benjamin; Yamamoto, Yukinori; Poplawsky, Jonathan
    • Metallurgical and Materials Transactions A, Vol. 48, Issue 10
    • DOI: 10.1007/s11661-017-4274-8

    Microstructure Development in Electron Beam-Melted Inconel 718 and Associated Tensile Properties
    journal, February 2016


    Strategy for Texture Management in Metals Additive Manufacturing
    journal, January 2017


    The transition from dislocation climb to viscous glide in creep of solid solution alloys
    journal, June 1974


    Intergranular fracture during power-law creep
    journal, September 1979


    On the mechanism of the inhibition of diffusional creep by second phase particles
    journal, June 1973


    The back stress concept in power law creep of metals: A review
    journal, October 1987


    A study of back stress during creep deformation of a superalloy inconel 718
    journal, January 1987


    The effect of grain boundary precipitates on the creep behavior of Inconel 718
    journal, June 1994


    Microstructures and mechanical behavior of Inconel 718 fabricated by selective laser melting
    journal, March 2012


    Creep deformation mechanisms in modified 9Cr–1Mo steel
    journal, April 2012


    γ″-Ni3Nb precipitate in Fe–Ni base alloy
    journal, November 2013


    Delta phase precipitation in Inconel 718
    journal, September 2004


    δ Phase precipitation in Inconel 718 and associated mechanical properties
    journal, January 2017


    Mechanical behavior of post-processed Inconel 718 manufactured through the electron beam melting process
    journal, January 2017


    Effects of build direction and heat treatment on creep properties of Ni-base superalloy built up by additive manufacturing
    journal, March 2017


    Interaction Of Grain Boundary Dislocations With Precipitates During High Temperature Creep
    journal, May 1979


    Interpretation of creep behaviour of a 9Cr–Mo–Nb–V–N (T91) steel using threshold stress concept
    journal, December 1999


    The Inhibition of Diffusion Creep by Precipitates
    journal, January 1973


    Thermal effects on microstructural heterogeneity of Inconel 718 materials fabricated by electron beam melting
    journal, July 2014

    • Sames, William J.; Unocic, Kinga A.; Dehoff, Ryan R.
    • Journal of Materials Research, Vol. 29, Issue 17
    • DOI: 10.1557/jmr.2014.140