Influence of Inclusions on Low Cycle Fatigue Life of PM Superalloy

In the range of operating the resistance to low cycle fatigue (LCF) of P/M nickel-based superalloy is one of the most important performances. In this paper the fracture features of LCF on P/M nickel-based superalloy were investigated. The study focused on macroscopic and microscopic features of LCF...

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Bibliographic Details
Published inIOP conference series. Materials Science and Engineering Vol. 269; no. 1; pp. 12005 - 12009
Main Authors Kai, Zhao, Xin-ling, Liu, Yu-huai, He
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 01.11.2017
Subjects
Fatigue life
Fractures
Inclusions
Life prediction
Low cycle fatigue
Morphology
Nickel
Nickel base alloys
Optical microscopes
Prediction models
Superalloys
Weibull distribution
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Summary:In the range of operating the resistance to low cycle fatigue (LCF) of P/M nickel-based superalloy is one of the most important performances. In this paper the fracture features of LCF on P/M nickel-based superalloy were investigated. The study focused on macroscopic and microscopic features of LCF fractures under 650°C, Δ ε=0.82%, R=0.05, 0.33Hz test condition by optical microscope and SEM. The types and morphologies of failure origins were observed. The effect of position and size of inclusions on LCF were researched. A new life prediction model appropriated for this test condition was provided. The result shows that the LCF life and the size of inclusions in this test condition follow the Weibull distribution. The LCF life exponentially decreases with the inclusion size increases.
ISSN:1757-8981
1757-899X
DOI:10.1088/1757-899X/269/1/012005