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Title: In Situ Study of the Stress Relaxation During Aging of Nickel-Base Superalloy Forgings

Abstract

Nickel-base superalloys are conventionally aged in order to develop a favorable microstructure as well as to relieve residual stresses. In this work, neutron diffraction was used to follow the evolution of residual stress during aging in Inconel 718 and Udimet 720LI for the first time by a combination of in situ and ex situ measurements. First, the quench-induced stress profiles were determined for different geometries of Inconel 718 forgings confirming that the amplitude of stress is not significantly affected by the thickness of the component. It was followed by in situ residual stress analysis using neutron diffraction during aging/annealing treatments at 650 °C, 720 °C, and 750 °C. Almost 90 pct of stress relaxation was found to occur primarily during heating to the aging temperature as a result of a combination of plasticity and early-stage creep relaxation. Creep-like stress relaxation was observed to evolve at a diminishing rate during the isothermal treatment of Inconel 718 at 720 °C and 750 °C, while no further stress relaxation occurred at 650 °C. This means that a change in hold temperature might have a more immediate impact on stress relaxation than a change in duration of heat treatment. Finally, the post-aging ex situmore » measurements showed that a heat treatment at 750 °C for 8 hours reduced the stresses by approximately 70 pct in Inconel 718. By comparison, when heat treating Udimet 720LI in the same way only a 20 pct stress reduction was observed, which is explained by the higher creep resistance of this alloy.« less

Authors:
 [1];  [2];  [3];  [4]; ORCiD logo [5];  [2]
  1. Institut Max Von Laue – Paul Langevin, Grenoble (France); Univ. of Manchester (United Kingdom)
  2. Univ. of Manchester (United Kingdom)
  3. Institut Max Von Laue – Paul Langevin, Grenoble (France)
  4. OPAL, Ansto, Kirrawee DC (Australia)
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1550768
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: 50; Journal Issue: 8; Journal ID: ISSN 1073-5623
Publisher:
ASM International
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Aba-Perea, Pierre E., Withers, Philip J., Pirling, T., Paradowska, A., Ma, Dong, and Preuss, M. In Situ Study of the Stress Relaxation During Aging of Nickel-Base Superalloy Forgings. United States: N. p., 2019. Web. doi:10.1007/s11661-019-05302-0.
Aba-Perea, Pierre E., Withers, Philip J., Pirling, T., Paradowska, A., Ma, Dong, & Preuss, M. In Situ Study of the Stress Relaxation During Aging of Nickel-Base Superalloy Forgings. United States. doi:10.1007/s11661-019-05302-0.
Aba-Perea, Pierre E., Withers, Philip J., Pirling, T., Paradowska, A., Ma, Dong, and Preuss, M. Mon . "In Situ Study of the Stress Relaxation During Aging of Nickel-Base Superalloy Forgings". United States. doi:10.1007/s11661-019-05302-0.
@article{osti_1550768,
title = {In Situ Study of the Stress Relaxation During Aging of Nickel-Base Superalloy Forgings},
author = {Aba-Perea, Pierre E. and Withers, Philip J. and Pirling, T. and Paradowska, A. and Ma, Dong and Preuss, M.},
abstractNote = {Nickel-base superalloys are conventionally aged in order to develop a favorable microstructure as well as to relieve residual stresses. In this work, neutron diffraction was used to follow the evolution of residual stress during aging in Inconel 718 and Udimet 720LI for the first time by a combination of in situ and ex situ measurements. First, the quench-induced stress profiles were determined for different geometries of Inconel 718 forgings confirming that the amplitude of stress is not significantly affected by the thickness of the component. It was followed by in situ residual stress analysis using neutron diffraction during aging/annealing treatments at 650 °C, 720 °C, and 750 °C. Almost 90 pct of stress relaxation was found to occur primarily during heating to the aging temperature as a result of a combination of plasticity and early-stage creep relaxation. Creep-like stress relaxation was observed to evolve at a diminishing rate during the isothermal treatment of Inconel 718 at 720 °C and 750 °C, while no further stress relaxation occurred at 650 °C. This means that a change in hold temperature might have a more immediate impact on stress relaxation than a change in duration of heat treatment. Finally, the post-aging ex situ measurements showed that a heat treatment at 750 °C for 8 hours reduced the stresses by approximately 70 pct in Inconel 718. By comparison, when heat treating Udimet 720LI in the same way only a 20 pct stress reduction was observed, which is explained by the higher creep resistance of this alloy.},
doi = {10.1007/s11661-019-05302-0},
journal = {Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science},
number = 8,
volume = 50,
place = {United States},
year = {2019},
month = {6}
}

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