Creep and creep modelling of a multimodal nickel-base superalloy

James Coakley, David Dye, Hector Basoalto

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

The creep properties of different γ'-Ni3Al distributions in the Ni115 nickel superalloy produced by heat treatment have been examined. At the stresses and temperatures employed it is shown that particle bypass cannot occur by cutting or bowing and so presumably occurs by a climb-glide motion. The creep strength of Ni115 is very poor at 800 °C and 360 MPa compared to 700 °C because the increase in coarsening rapidly removes the bimodal structure. The Dyson creep model is a microstructure-based climb-glide bypass model for unimodal distributions that links microstructural evolution (e.g. evolution of the particle dispersion) to the creep rate. The creep tests are interpreted with the aid of the model and appear to suggest that the fine γ', when present, strongly influences the dislocation motion. A quasi-bimodal model is developed to account for bimodal distributions and the predictions compared to experiment. The model predicts a number of the observed experimental trends, and it's shortcomings are identified in order to identify avenues for future improvement.
LanguageEnglish
Pages854–863
Number of pages10
JournalActa Materialia
Volume59
Issue number3
DOIs
Publication statusPublished - Feb 2011

Fingerprint

Nickel
Superalloys
Creep
Bending (forming)
Microstructural evolution
Coarsening
Heat treatment
Microstructure
Experiments
Temperature

Keywords

  • nickel alloys
  • modelling
  • creep
  • creep modelling

Cite this

Coakley, James ; Dye, David ; Basoalto, Hector. / Creep and creep modelling of a multimodal nickel-base superalloy. In: Acta Materialia. 2011 ; Vol. 59, No. 3. pp. 854–863.
@article{a7d4933537484812ac5a6eff4624bd61,
title = "Creep and creep modelling of a multimodal nickel-base superalloy",
abstract = "The creep properties of different γ'-Ni3Al distributions in the Ni115 nickel superalloy produced by heat treatment have been examined. At the stresses and temperatures employed it is shown that particle bypass cannot occur by cutting or bowing and so presumably occurs by a climb-glide motion. The creep strength of Ni115 is very poor at 800 °C and 360 MPa compared to 700 °C because the increase in coarsening rapidly removes the bimodal structure. The Dyson creep model is a microstructure-based climb-glide bypass model for unimodal distributions that links microstructural evolution (e.g. evolution of the particle dispersion) to the creep rate. The creep tests are interpreted with the aid of the model and appear to suggest that the fine γ', when present, strongly influences the dislocation motion. A quasi-bimodal model is developed to account for bimodal distributions and the predictions compared to experiment. The model predicts a number of the observed experimental trends, and it's shortcomings are identified in order to identify avenues for future improvement.",
keywords = "nickel alloys, modelling, creep, creep modelling",
author = "James Coakley and David Dye and Hector Basoalto",
year = "2011",
month = "2",
doi = "10.1016/j.actamat.2010.08.035",
language = "English",
volume = "59",
pages = "854–863",
journal = "Acta Materialia",
issn = "1359-6454",
number = "3",

}

Creep and creep modelling of a multimodal nickel-base superalloy. / Coakley, James; Dye, David; Basoalto, Hector.

In: Acta Materialia, Vol. 59, No. 3, 02.2011, p. 854–863.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Creep and creep modelling of a multimodal nickel-base superalloy

AU - Coakley, James

AU - Dye, David

AU - Basoalto, Hector

PY - 2011/2

Y1 - 2011/2

N2 - The creep properties of different γ'-Ni3Al distributions in the Ni115 nickel superalloy produced by heat treatment have been examined. At the stresses and temperatures employed it is shown that particle bypass cannot occur by cutting or bowing and so presumably occurs by a climb-glide motion. The creep strength of Ni115 is very poor at 800 °C and 360 MPa compared to 700 °C because the increase in coarsening rapidly removes the bimodal structure. The Dyson creep model is a microstructure-based climb-glide bypass model for unimodal distributions that links microstructural evolution (e.g. evolution of the particle dispersion) to the creep rate. The creep tests are interpreted with the aid of the model and appear to suggest that the fine γ', when present, strongly influences the dislocation motion. A quasi-bimodal model is developed to account for bimodal distributions and the predictions compared to experiment. The model predicts a number of the observed experimental trends, and it's shortcomings are identified in order to identify avenues for future improvement.

AB - The creep properties of different γ'-Ni3Al distributions in the Ni115 nickel superalloy produced by heat treatment have been examined. At the stresses and temperatures employed it is shown that particle bypass cannot occur by cutting or bowing and so presumably occurs by a climb-glide motion. The creep strength of Ni115 is very poor at 800 °C and 360 MPa compared to 700 °C because the increase in coarsening rapidly removes the bimodal structure. The Dyson creep model is a microstructure-based climb-glide bypass model for unimodal distributions that links microstructural evolution (e.g. evolution of the particle dispersion) to the creep rate. The creep tests are interpreted with the aid of the model and appear to suggest that the fine γ', when present, strongly influences the dislocation motion. A quasi-bimodal model is developed to account for bimodal distributions and the predictions compared to experiment. The model predicts a number of the observed experimental trends, and it's shortcomings are identified in order to identify avenues for future improvement.

KW - nickel alloys

KW - modelling

KW - creep

KW - creep modelling

UR - http://www.scopus.com/inward/record.url?scp=78650703844&partnerID=8YFLogxK

U2 - 10.1016/j.actamat.2010.08.035

DO - 10.1016/j.actamat.2010.08.035

M3 - Article

VL - 59

SP - 854

EP - 863

JO - Acta Materialia

T2 - Acta Materialia

JF - Acta Materialia

SN - 1359-6454

IS - 3

ER -