The effect of cold rolling on the creep behavior of inconel® alloy 718

C. J. Boehlert, D. S. Dickmann, N. C. Eisinger

Research output: Chapter in Book/Report/Conference proceedingConference contribution

  • 1 Citations

Abstract

The creep behavior of INCONEL® alloy 718 (IN 718) was investigated to identify processingcreep property relationships. The alloy was cold rolled (CR) to 0, 10, 20, 30, 40, 60, and 80% followed by annealing and aging. In addition, this alloy can be superplastically formed (IN 718SPF) to a significantly finer grain size and the corresponding microstructure and creep behavior were evaluated. The creep behavior was evaluated in the applied stress range of 300-758MPa and the temperature range of 638-670°C. Constant-load tensile-creep experiments were used to measure the values of the steady-state creep rate and the consecutive load reduction method was used to determine the values of backstress σo). Creep-rupture time (Tr) and elongation-to-failure (εf) were also evaluated at 649°C and 758MPa. The lowest σo values (300MPaoo value (540MPa). The greatest σo values, 645 and 630MPa, were exhibited by the 20% and 30%CR conditions, respectively.σo The values were related to the overall creep resistance as the 20%CR condition exhibited the lowest secondary creep rates for a given applied stress (σa), while the samples CR to more than 40% exhibited the greatest creep rates. The values for the effective stress exponent suggested that the transition between the rate-controlling creep mechanisms was dependent on effective stresses (σea0) and the transition occurred at σe=135MPa for a temperature of 638°C. Increased CR tended to increase Tr and ε f, and the 30%CR condition exhibited the greatest creep rupture properties. Overall, the 20%CR and 30%CR microstructures exhibited the greatest creep strength, while the most severely CR materials exhibited the poorest creep strength.

LanguageEnglish (US)
Title of host publicationProceedings of the International Symposium on Superalloys and Various Derivatives
EditorsE.A. Loria
Pages311-320
Number of pages10
StatePublished - 2005
Event6th International Symposium on Superalloys 718, 625, 706 and Derivatives - Pittsburgh, PA, United States
Duration: Oct 2 2005Oct 5 2005

Other

Other6th International Symposium on Superalloys 718, 625, 706 and Derivatives
CountryUnited States
CityPittsburgh, PA
Period10/2/0510/5/05

Profile

Cold rolling
Creep
Microstructure
Creep resistance
Elongation
Aging of materials
Annealing

Keywords

  • Backstress
  • Creep
  • Creep rupture
  • Microstructure

ASJC Scopus subject areas

  • Metals and Alloys

Cite this

Boehlert, C. J., Dickmann, D. S., & Eisinger, N. C. (2005). The effect of cold rolling on the creep behavior of inconel® alloy 718. In E. A. Loria (Ed.), Proceedings of the International Symposium on Superalloys and Various Derivatives (pp. 311-320)

The effect of cold rolling on the creep behavior of inconel® alloy 718. / Boehlert, C. J.; Dickmann, D. S.; Eisinger, N. C.

Proceedings of the International Symposium on Superalloys and Various Derivatives. ed. / E.A. Loria. 2005. p. 311-320.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Boehlert, CJ, Dickmann, DS & Eisinger, NC 2005, The effect of cold rolling on the creep behavior of inconel® alloy 718. in EA Loria (ed.), Proceedings of the International Symposium on Superalloys and Various Derivatives. pp. 311-320, 6th International Symposium on Superalloys 718, 625, 706 and Derivatives, Pittsburgh, PA, United States, 10/2/05.
Boehlert CJ, Dickmann DS, Eisinger NC. The effect of cold rolling on the creep behavior of inconel® alloy 718. In Loria EA, editor, Proceedings of the International Symposium on Superalloys and Various Derivatives. 2005. p. 311-320.
Boehlert, C. J. ; Dickmann, D. S. ; Eisinger, N. C./ The effect of cold rolling on the creep behavior of inconel® alloy 718. Proceedings of the International Symposium on Superalloys and Various Derivatives. editor / E.A. Loria. 2005. pp. 311-320
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abstract = "The creep behavior of INCONEL{\circledR} alloy 718 (IN 718) was investigated to identify processingcreep property relationships. The alloy was cold rolled (CR) to 0, 10, 20, 30, 40, 60, and 80{\%} followed by annealing and aging. In addition, this alloy can be superplastically formed (IN 718SPF) to a significantly finer grain size and the corresponding microstructure and creep behavior were evaluated. The creep behavior was evaluated in the applied stress range of 300-758MPa and the temperature range of 638-670°C. Constant-load tensile-creep experiments were used to measure the values of the steady-state creep rate and the consecutive load reduction method was used to determine the values of backstress σo). Creep-rupture time (Tr) and elongation-to-failure (εf) were also evaluated at 649°C and 758MPa. The lowest σo values (300MPaoo value (540MPa). The greatest σo values, 645 and 630MPa, were exhibited by the 20{\%} and 30{\%}CR conditions, respectively.σo The values were related to the overall creep resistance as the 20{\%}CR condition exhibited the lowest secondary creep rates for a given applied stress (σa), while the samples CR to more than 40{\%} exhibited the greatest creep rates. The values for the effective stress exponent suggested that the transition between the rate-controlling creep mechanisms was dependent on effective stresses (σe=σa-σ0) and the transition occurred at σe=135MPa for a temperature of 638°C. Increased CR tended to increase Tr and ε f, and the 30{\%}CR condition exhibited the greatest creep rupture properties. Overall, the 20{\%}CR and 30{\%}CR microstructures exhibited the greatest creep strength, while the most severely CR materials exhibited the poorest creep strength.",
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