Creep deformation mechanism mapping in nickel base disk superalloys

Smith, Timothy M.; Unocic, Raymond R.; Deutchman, Hallee; Mills, Michael J.

doi:10.1080/09603409.2016.1180858

Title: Creep deformation mechanism mapping in nickel base disk superalloys

Abstract

We investigated the creep deformation mechanisms at intermediate temperature in ME3, a modern Ni-based disk superalloy, using diffraction contrast imaging. Both conventional transmission electron microscopy (TEM) and scanning TEM were utilised. Distinctly different deformation mechanisms become operative during creep at temperatures between 677-815 °C and at stresses ranging from 274 to 724 MPa. Both polycrystalline and single-crystal creep tests were conducted. The single-crystal tests provide new insight into grain orientation effects on creep response and deformation mechanisms. Creep at lower temperatures (≤760 °C) resulted in the thermally activated shearing modes such as microtwinning, stacking fault ribbons and isolated superlattice extrinsic stacking faults. In contrast, these faulting modes occurred much less frequently during creep at 815 °C under lower applied stresses. Instead, the principal deformation mode was dislocation climb bypass. In addition to the difference in creep behaviour and creep deformation mechanisms as a function of stress and temperature, it was also observed that microstructural evolution occurs during creep at 760 °C and above, where the secondary coarsened and the tertiary precipitates dissolved. Based on this work, a creep deformation mechanism map is proposed, emphasising the influence of stress and temperature on the underlying creep mechanisms.

Authors:

Smith, Timothy M. ^[1]; Unocic, Raymond R. ^[2]; Deutchman, Hallee ^[1]; Mills, Michael J. ^[1]

The Ohio State Univ., Columbus, OH (United States). Center for Electron Microscopy and Analysis
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Science (CNMS)

Publication Date:: Tue May 10 00:00:00 EDT 2016

Research Org.:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Org.:: USDOE Office of Science (SC); GE University Strategic Alliance

OSTI Identifier:: 1328294

Grant/Contract Number:: AC05-00OR22725; 1534826

Resource Type:: Accepted Manuscript

Journal Name:: Materials at High Temperatures

Additional Journal Information:: Journal Volume: 33; Journal Issue: 4-5; Journal ID: ISSN 0960-3409

Publisher:: Maney Publishing

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; Ni-base Superalloys; SEM; TEM; STEM; Mechanism map; Creep deformation,

Citation Formats


                    Smith, Timothy M., Unocic, Raymond R., Deutchman, Hallee, and Mills, Michael J. Creep deformation mechanism mapping in nickel base disk superalloys.  United States: N. p., 2016. 
Web.  doi:10.1080/09603409.2016.1180858.

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                    Smith, Timothy M., Unocic, Raymond R., Deutchman, Hallee, & Mills, Michael J. Creep deformation mechanism mapping in nickel base disk superalloys.  United States.  https://doi.org/10.1080/09603409.2016.1180858

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                    Smith, Timothy M., Unocic, Raymond R., Deutchman, Hallee, and Mills, Michael J. Tue .  
"Creep deformation mechanism mapping in nickel base disk superalloys".  United States.  https://doi.org/10.1080/09603409.2016.1180858.  https://www.osti.gov/servlets/purl/1328294.

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@article{osti_1328294,

  title        = {Creep deformation mechanism mapping in nickel base disk superalloys},

  author       = {Smith, Timothy M. and Unocic, Raymond R. and Deutchman, Hallee and Mills, Michael J.},

  abstractNote = {We investigated the creep deformation mechanisms at intermediate temperature in ME3, a modern Ni-based disk superalloy, using diffraction contrast imaging. Both conventional transmission electron microscopy (TEM) and scanning TEM were utilised. Distinctly different deformation mechanisms become operative during creep at temperatures between 677-815 °C and at stresses ranging from 274 to 724 MPa. Both polycrystalline and single-crystal creep tests were conducted. The single-crystal tests provide new insight into grain orientation effects on creep response and deformation mechanisms. Creep at lower temperatures (≤760 °C) resulted in the thermally activated shearing modes such as microtwinning, stacking fault ribbons and isolated superlattice extrinsic stacking faults. In contrast, these faulting modes occurred much less frequently during creep at 815 °C under lower applied stresses. Instead, the principal deformation mode was dislocation climb bypass. In addition to the difference in creep behaviour and creep deformation mechanisms as a function of stress and temperature, it was also observed that microstructural evolution occurs during creep at 760 °C and above, where the secondary coarsened and the tertiary precipitates dissolved. Based on this work, a creep deformation mechanism map is proposed, emphasising the influence of stress and temperature on the underlying creep mechanisms.},

  doi          = {10.1080/09603409.2016.1180858},

  journal      = {Materials at High Temperatures},

  number       = 4-5,

  volume       = 33,

  place        = {United States},

  year         = {Tue May 10 00:00:00 EDT 2016},

  month        = {Tue May 10 00:00:00 EDT 2016}

}

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Works referenced in this record:

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Works referencing / citing this record:

Segregation and Phase Transformations Along Superlattice Intrinsic Stacking Faults in Ni-Based Superalloys
journal, June 2018

Smith, T. M.; Esser, B. D.; Good, B.
Metallurgical and Materials Transactions A, Vol. 49, Issue 9
DOI: 10.1007/s11661-018-4701-5

The Effect of a Grain Boundary Pinning B2 Phase on Polycrystalline Co-Based Superalloys with Reduced Density
journal, June 2018

Freund, Lisa P.; Stark, Andreas; Kirchmayer, Andreas
Metallurgical and Materials Transactions A, Vol. 49, Issue 9
DOI: 10.1007/s11661-018-4757-2

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Title: Creep deformation mechanism mapping in nickel base disk superalloys

Abstract

Citation Formats

A History of Superalloy Metallurgy for Superalloy Metallurgists conference, January 1984

A theory of the anomalous yield behavior in L12 ordered alloys journal, March 1984

Mechanism of 〈112〉/3 slip initiation and anisotropy of γ′ phase in CMSX-4 during creep at 750°C and 750 MPa journal, September 2003

Decorrelated movements of Shockley partial dislocations in the γ-phase channels of nickel-based superalloys at intermediate temperature journal, March 2006

High-resolution electron microscopy of dislocation ribbons in a CMSX-4 superalloy single crystal journal, July 2012

Effects of cooling rate and γ′ morphology on creep and stress-rupture properties of a powder metallurgy superalloy journal, June 1990

Effect of primary and secondary precipitates on creep strength of Ni-base superalloy single crystals journal, February 2000

On the Role of Tertiary γ' Precipitates in the Creep Behaviour at 700�C of a PM Disk Superalloy conference, January 2004

Creep of CMSX-4 single crystals of different orientations in tension and compression journal, April 1996

Creep Anisotropy in the Monocrystalline Nickel-Base Superalloy CMSX-4 conference, January 1996

Tension/compression asymmetry in creep behavior of a Ni-based superalloy journal, August 1999

Shearing of γ′ precipitates by a〈112〉 dislocation ribbons in Ni-base superalloys: A phase field approach journal, July 2010

The role of stacking fault shear in the primary creep of [001]-oriented single crystal superalloys at 750°C and 750 MPa journal, February 2001

Dislocation decorrelation and relationship to deformation microtwins during creep of a γ′ precipitate strengthened Ni-based superalloy journal, November 2011

Microtwinning during intermediate temperature creep of polycrystalline Ni-based superalloys: mechanisms and modelling journal, October 2006

Strengthening Mechanisms in γ′ Precipitating Alloys journal, January 1970

Slip and climb processes in γ′ precipitation hardened nickel-base alloys journal, May 1968

Superlattice stacking fault formation and twinning during creep in γ/γ′ single crystal superalloy CMSX-4 journal, January 2003

Twin formation during creep in single crystals of nickel-based superalloys journal, July 1999

Deformation twinning journal, January 1995

The high temperature decrease of the critical resolved shear stress in nickel-base superalloys journal, December 2001

Modeling microtwinning during creep in Ni-based superalloys journal, March 2006

Microtwinning and other shearing mechanisms at intermediate temperatures in Ni-based superalloys journal, August 2009

Segregation and η phase formation along stacking faults during creep at intermediate temperatures in a Ni-based superalloy journal, November 2015

The mechanisms and temperature dependence of superlattice stacking fault formation in the single-crystal superalloy PWA 1480 journal, October 1991

High resolution energy dispersive spectroscopy mapping of planar defects in L12-containing Co-base superalloys journal, May 2015

Mechanisms of creep deformation in polycrystalline Ni-base disk superalloys journal, June 2008

Segregation and Phase Transformations Along Superlattice Intrinsic Stacking Faults in Ni-Based Superalloys journal, June 2018

The Effect of a Grain Boundary Pinning B2 Phase on Polycrystalline Co-Based Superalloys with Reduced Density journal, June 2018

A History of Superalloy Metallurgy for Superalloy Metallurgists
conference, January 1984

A theory of the anomalous yield behavior in L12 ordered alloys
journal, March 1984

Mechanism of 〈112〉/3 slip initiation and anisotropy of γ′ phase in CMSX-4 during creep at 750°C and 750 MPa
journal, September 2003

Decorrelated movements of Shockley partial dislocations in the γ-phase channels of nickel-based superalloys at intermediate temperature
journal, March 2006

High-resolution electron microscopy of dislocation ribbons in a CMSX-4 superalloy single crystal
journal, July 2012

Effects of cooling rate and γ′ morphology on creep and stress-rupture properties of a powder metallurgy superalloy
journal, June 1990

Effect of primary and secondary precipitates on creep strength of Ni-base superalloy single crystals
journal, February 2000

On the Role of Tertiary γ' Precipitates in the Creep Behaviour at 700�C of a PM Disk Superalloy
conference, January 2004

Creep of CMSX-4 single crystals of different orientations in tension and compression
journal, April 1996

Creep Anisotropy in the Monocrystalline Nickel-Base Superalloy CMSX-4
conference, January 1996

Tension/compression asymmetry in creep behavior of a Ni-based superalloy
journal, August 1999

Shearing of γ′ precipitates by a〈112〉 dislocation ribbons in Ni-base superalloys: A phase field approach
journal, July 2010

The role of stacking fault shear in the primary creep of [001]-oriented single crystal superalloys at 750°C and 750 MPa
journal, February 2001

Dislocation decorrelation and relationship to deformation microtwins during creep of a γ′ precipitate strengthened Ni-based superalloy
journal, November 2011

Microtwinning during intermediate temperature creep of polycrystalline Ni-based superalloys: mechanisms and modelling
journal, October 2006

Strengthening Mechanisms in γ′ Precipitating Alloys
journal, January 1970

Slip and climb processes in γ′ precipitation hardened nickel-base alloys
journal, May 1968

Superlattice stacking fault formation and twinning during creep in γ/γ′ single crystal superalloy CMSX-4
journal, January 2003

Twin formation during creep in single crystals of nickel-based superalloys
journal, July 1999

Deformation twinning
journal, January 1995

The high temperature decrease of the critical resolved shear stress in nickel-base superalloys
journal, December 2001

Modeling microtwinning during creep in Ni-based superalloys
journal, March 2006

Microtwinning and other shearing mechanisms at intermediate temperatures in Ni-based superalloys
journal, August 2009

Segregation and η phase formation along stacking faults during creep at intermediate temperatures in a Ni-based superalloy
journal, November 2015

The mechanisms and temperature dependence of superlattice stacking fault formation in the single-crystal superalloy PWA 1480
journal, October 1991

High resolution energy dispersive spectroscopy mapping of planar defects in L12-containing Co-base superalloys
journal, May 2015

Mechanisms of creep deformation in polycrystalline Ni-base disk superalloys
journal, June 2008

Segregation and Phase Transformations Along Superlattice Intrinsic Stacking Faults in Ni-Based Superalloys
journal, June 2018

The Effect of a Grain Boundary Pinning B2 Phase on Polycrystalline Co-Based Superalloys with Reduced Density
journal, June 2018