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

Creep deformation mechanism mapping in nickel base disk superalloys

Journal Article · Tue May 10 00:00:00 EDT 2016 · Materials at High Temperatures

DOI:https://doi.org/10.1080/09603409.2016.1180858· OSTI ID:1328294

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)

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.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

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

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1328294

Journal Information:: Materials at High Temperatures, Journal Name: Materials at High Temperatures Journal Issue: 4-5 Vol. 33; ISSN 0960-3409

Publisher:: Maney PublishingCopyright Statement

Country of Publication:: United States

Language:: English

References (27)

The mechanisms and temperature dependence of superlattice stacking fault formation in the single-crystal superalloy PWA 1480 Milligan, Walter W.; Antolovich, Stephen D. Metallurgical Transactions A, Vol. 22, Issue 10 https://doi.org/10.1007/BF02664997	journal	October 1991
Effects of cooling rate and γ′ morphology on creep and stress-rupture properties of a powder metallurgy superalloy Bhowal, P. R.; Wright, E. F.; Raymond, E. L. Metallurgical Transactions A, Vol. 21, Issue 6 https://doi.org/10.1007/BF02672587	journal	June 1990
A theory of the anomalous yield behavior in L12 ordered alloys Paidar, V.; Pope, D. P.; Vitek, V. Acta Metallurgica, Vol. 32, Issue 3 https://doi.org/10.1016/0001-6160(84)90117-2	journal	March 1984
Slip and climb processes in γ′ precipitation hardened nickel-base alloys Kear, B. H.; Giamei, A. F.; Silcock, J. M. Scripta Metallurgica, Vol. 2, Issue 5 https://doi.org/10.1016/0036-9748(68)90123-3	journal	May 1968
Deformation twinning Christian, J. W.; Mahajan, S. Progress in Materials Science, Vol. 39, Issue 1-2 https://doi.org/10.1016/0079-6425(94)00007-7	journal	January 1995
Creep of CMSX-4 single crystals of different orientations in tension and compression Lukáš, P.; Čadek, J.; Šustek, V. Materials Science and Engineering: A, Vol. 208, Issue 2 https://doi.org/10.1016/0921-5093(95)10052-0	journal	April 1996
The role of stacking fault shear in the primary creep of [001]-oriented single crystal superalloys at 750°C and 750 MPa Rae, C. M. F.; Matan, N.; Reed, R. C. Materials Science and Engineering: A, Vol. 300, Issue 1-2 https://doi.org/10.1016/S0921-5093(00)01788-3	journal	February 2001
The high temperature decrease of the critical resolved shear stress in nickel-base superalloys Kolbe, M. Materials Science and Engineering: A, Vol. 319-321 https://doi.org/10.1016/S0921-5093(01)00944-3	journal	December 2001
Superlattice stacking fault formation and twinning during creep in γ/γ′ single crystal superalloy CMSX-4 Knowles, D. M.; Chen, Q. Z. Materials Science and Engineering: A, Vol. 340, Issue 1-2 https://doi.org/10.1016/S0921-5093(02)00172-7	journal	January 2003
Mechanism of 〈112〉/3 slip initiation and anisotropy of γ′ phase in CMSX-4 during creep at 750°C and 750 MPa Chen, Q. Z.; Knowles, D. M. Materials Science and Engineering: A, Vol. 356, Issue 1-2 https://doi.org/10.1016/S0921-5093(03)00148-5	journal	September 2003
Effect of primary and secondary precipitates on creep strength of Ni-base superalloy single crystals Kakehi, Koji Materials Science and Engineering: A, Vol. 278, Issue 1-2 https://doi.org/10.1016/S0921-5093(99)00579-1	journal	February 2000
Twin formation during creep in single crystals of nickel-based superalloys Ardakani, M. G.; McLean, M.; Shollock, B. A. Acta Materialia, Vol. 47, Issue 9 https://doi.org/10.1016/S1359-6454(99)00145-7	journal	July 1999
Tension/compression asymmetry in creep behavior of a Ni-based superalloy Kakehi, K. Scripta Materialia, Vol. 41, Issue 5 https://doi.org/10.1016/S1359-6462(99)00191-8	journal	August 1999
Shearing of γ′ precipitates by a〈112〉 dislocation ribbons in Ni-base superalloys: A phase field approach Vorontsov, V. A.; Shen, C.; Wang, Y. Acta Materialia, Vol. 58, Issue 12 https://doi.org/10.1016/j.actamat.2010.03.041	journal	July 2010
Dislocation decorrelation and relationship to deformation microtwins during creep of a γ′ precipitate strengthened Ni-based superalloy Unocic, R. R.; Zhou, N.; Kovarik, L. Acta Materialia, Vol. 59, Issue 19 https://doi.org/10.1016/j.actamat.2011.07.069	journal	November 2011
High-resolution electron microscopy of dislocation ribbons in a CMSX-4 superalloy single crystal Vorontsov, V. A.; Kovarik, L.; Mills, M. J. Acta Materialia, Vol. 60, Issue 12 https://doi.org/10.1016/j.actamat.2012.05.014	journal	July 2012
High resolution energy dispersive spectroscopy mapping of planar defects in L12-containing Co-base superalloys Titus, Michael S.; Mottura, Alessandro; Babu Viswanathan, G. Acta Materialia, Vol. 89 https://doi.org/10.1016/j.actamat.2015.01.050	journal	May 2015
Segregation and η phase formation along stacking faults during creep at intermediate temperatures in a Ni-based superalloy Smith, T. M.; Esser, B. D.; Antolin, N. Acta Materialia, Vol. 100 https://doi.org/10.1016/j.actamat.2015.08.053	journal	November 2015
Mechanisms of creep deformation in polycrystalline Ni-base disk superalloys Unocic, R. R.; Viswanathan, G. B.; Sarosi, P. M. Materials Science and Engineering: A, Vol. 483-484 https://doi.org/10.1016/j.msea.2006.08.148	journal	June 2008
Microtwinning and other shearing mechanisms at intermediate temperatures in Ni-based superalloys Kovarik, L.; Unocic, R. R.; Li, Ju Progress in Materials Science, Vol. 54, Issue 6 https://doi.org/10.1016/j.pmatsci.2009.03.010	journal	August 2009
Modeling microtwinning during creep in Ni-based superalloys Karthikeyan, S.; Unocic, R. R.; Sarosi, P. M. Scripta Materialia, Vol. 54, Issue 6 https://doi.org/10.1016/j.scriptamat.2005.11.049	journal	March 2006
Decorrelated movements of Shockley partial dislocations in the γ-phase channels of nickel-based superalloys at intermediate temperature Raujol, S.; Benyoucef, M.; Locq, D. Philosophical Magazine, Vol. 86, Issue 9 https://doi.org/10.1080/14786430500254685	journal	March 2006
Microtwinning during intermediate temperature creep of polycrystalline Ni-based superalloys: mechanisms and modelling Viswanathan, G. B.; Karthikeyan, S.; Sarosi, P. M. Philosophical Magazine, Vol. 86, Issue 29-31 https://doi.org/10.1080/14786430600767750	journal	October 2006
Strengthening Mechanisms in γ′ Precipitating Alloys Raynor, D.; Silcock, J. M. Metal Science Journal, Vol. 4, Issue 1 https://doi.org/10.1179/msc.1970.4.1.121	journal	January 1970
A History of Superalloy Metallurgy for Superalloy Metallurgists Sims, C. T. Superalloys 1984 (Fifth International Symposium) https://doi.org/10.7449/1984/Superalloys_1984_399_419	conference	January 1984
Creep Anisotropy in the Monocrystalline Nickel-Base Superalloy CMSX-4 Sass, V.; Glatzel, U.; Feller-Kniepmeier, M. Superalloys 1996 (Eighth International Symposium) https://doi.org/10.7449/1996/Superalloys_1996_283_290	conference	January 1996
On the Role of Tertiary γ' Precipitates in the Creep Behaviour at 700�C of a PM Disk Superalloy Locq, D.; Caron, P.; Raujol, S. Superalloys 2004 (Tenth International Symposium) https://doi.org/10.7449/2004/Superalloys_2004_179_187	conference	January 2004

Cited By (2)

Segregation and Phase Transformations Along Superlattice Intrinsic Stacking Faults in Ni-Based Superalloys Smith, T. M.; Esser, B. D.; Good, B. Metallurgical and Materials Transactions A, Vol. 49, Issue 9 https://doi.org/10.1007/s11661-018-4701-5	journal	June 2018
The Effect of a Grain Boundary Pinning B2 Phase on Polycrystalline Co-Based Superalloys with Reduced Density Freund, Lisa P.; Stark, Andreas; Kirchmayer, Andreas Metallurgical and Materials Transactions A, Vol. 49, Issue 9 https://doi.org/10.1007/s11661-018-4757-2	journal	June 2018

Similar Records

Dislocation decorrelation and relationship to deformation microtwins during creep of a y' precipitate strengthened Ni-based superalloy

Journal Article · Tue Nov 01 00:00:00 EDT 2011 · Acta Materialia, 59(19):7325–7339 · OSTI ID:1026609

Dislocation decorrelation and relationship to deformation microtwins during creep of a precipitate strengthened Ni-based superalloy

Journal Article · Fri Dec 31 23:00:00 EST 2010 · Acta Materialia · OSTI ID:1025392

Dissociated matrix dislocations in a omicron/omicron'Ni-based single crystal superalloy

Journal Article · Mon Oct 01 00:00:00 EDT 1984 · Scr. Metall.; (United States) · OSTI ID:5897605

Related Subjects

36 MATERIALS SCIENCE
Creep deformation
Mechanism map
Ni-base Superalloys
SEM
STEM
TEM

Creep deformation mechanism mapping in nickel base disk superalloys

Citation Formats

References (27)

Cited By (2)

Similar Records

Related Subjects