Creep behavior of a nickel-based superalloy under cyclic temperatures

Qiang Zhang; Xiaoan Hu; Bin Li; Xiaoguang Yang; Yun Jiang; Yantao Sun; Shengliang Zhang

doi:10.1016/j.scriptamat.2020.113702

Creep behavior of a nickel-based superalloy under cyclic temperatures

Qiang Zhang
, Xiaoan Hu^*
, Bin Li
, Xiaoguang Yang
, Yun Jiang
, Yantao Sun
, Shengliang Zhang

^*Corresponding author for this work

School of Energy and Power Engineering

Nanchang Hangkong University
Equipment Department of China PLA Air Force
China Aviation Industry Corporation

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

Abstract

In this paper, the thermal-cycling creep of Ni-based superalloy DZ125 is investigated at very high temperature. Experiments were conducted with various parameters including overheating duration, applied stress, temperature interval and heating/cooling frequency. Microscopic observation has revealed a modified thermodynamic equilibrium with lower γ’ content in comparison to isothermal creep situation. This phenomenon is discussed on the basis of Johnson-Mehl-Avrami-Kolmogorov law and pre-existing theoretical assumptions of dislocation density evolution during thermal transients. A linear relationship between overheating numbers and equilibrium γ’ content is obtained to develop a phenomenological life model of thermal-cycling creep. Life prediction results of proposed method are in good agreement with experimental ones.

Original language	English
Article number	113702
Journal	Scripta Materialia
Volume	194
DOIs	https://doi.org/10.1016/j.scriptamat.2020.113702
State	Published - 15 Mar 2021

Keywords

Life prediction
Nickel-based superalloy
Thermal-cycling creep
Thermodynamic equilibrium

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10.1016/j.scriptamat.2020.113702

Cite this

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title = "Creep behavior of a nickel-based superalloy under cyclic temperatures",

abstract = "In this paper, the thermal-cycling creep of Ni-based superalloy DZ125 is investigated at very high temperature. Experiments were conducted with various parameters including overheating duration, applied stress, temperature interval and heating/cooling frequency. Microscopic observation has revealed a modified thermodynamic equilibrium with lower γ{\textquoteright} content in comparison to isothermal creep situation. This phenomenon is discussed on the basis of Johnson-Mehl-Avrami-Kolmogorov law and pre-existing theoretical assumptions of dislocation density evolution during thermal transients. A linear relationship between overheating numbers and equilibrium γ{\textquoteright} content is obtained to develop a phenomenological life model of thermal-cycling creep. Life prediction results of proposed method are in good agreement with experimental ones.",

keywords = "Life prediction, Nickel-based superalloy, Thermal-cycling creep, Thermodynamic equilibrium",

author = "Qiang Zhang and Xiaoan Hu and Bin Li and Xiaoguang Yang and Yun Jiang and Yantao Sun and Shengliang Zhang",

note = "Publisher Copyright: {\textcopyright} 2020",

year = "2021",

month = mar,

day = "15",

doi = "10.1016/j.scriptamat.2020.113702",

language = "英语",

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journal = "Scripta Materialia",

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TY - JOUR

T1 - Creep behavior of a nickel-based superalloy under cyclic temperatures

AU - Zhang, Qiang

AU - Hu, Xiaoan

AU - Li, Bin

AU - Yang, Xiaoguang

AU - Jiang, Yun

AU - Sun, Yantao

AU - Zhang, Shengliang

PY - 2021/3/15

Y1 - 2021/3/15

N2 - In this paper, the thermal-cycling creep of Ni-based superalloy DZ125 is investigated at very high temperature. Experiments were conducted with various parameters including overheating duration, applied stress, temperature interval and heating/cooling frequency. Microscopic observation has revealed a modified thermodynamic equilibrium with lower γ’ content in comparison to isothermal creep situation. This phenomenon is discussed on the basis of Johnson-Mehl-Avrami-Kolmogorov law and pre-existing theoretical assumptions of dislocation density evolution during thermal transients. A linear relationship between overheating numbers and equilibrium γ’ content is obtained to develop a phenomenological life model of thermal-cycling creep. Life prediction results of proposed method are in good agreement with experimental ones.

AB - In this paper, the thermal-cycling creep of Ni-based superalloy DZ125 is investigated at very high temperature. Experiments were conducted with various parameters including overheating duration, applied stress, temperature interval and heating/cooling frequency. Microscopic observation has revealed a modified thermodynamic equilibrium with lower γ’ content in comparison to isothermal creep situation. This phenomenon is discussed on the basis of Johnson-Mehl-Avrami-Kolmogorov law and pre-existing theoretical assumptions of dislocation density evolution during thermal transients. A linear relationship between overheating numbers and equilibrium γ’ content is obtained to develop a phenomenological life model of thermal-cycling creep. Life prediction results of proposed method are in good agreement with experimental ones.

KW - Life prediction

KW - Nickel-based superalloy

KW - Thermal-cycling creep

KW - Thermodynamic equilibrium

UR - https://www.scopus.com/pages/publications/85098948911

U2 - 10.1016/j.scriptamat.2020.113702

DO - 10.1016/j.scriptamat.2020.113702

M3 - 文章

AN - SCOPUS:85098948911

SN - 1359-6462

VL - 194

JO - Scripta Materialia

JF - Scripta Materialia

M1 - 113702

ER -

Creep behavior of a nickel-based superalloy under cyclic temperatures

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Keywords

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