Micromechanisms of fatigue crack growth in a single crystal Inconel 718 nickel-based superalloy

C. Mercer; A. B.O. Soboyejo; W. O. Soboyejo

doi:10.1016/S1359-6454(99)00123-8

Micromechanisms of fatigue crack growth in a single crystal Inconel 718 nickel-based superalloy

C. Mercer
, A. B.O. Soboyejo
, W. O. Soboyejo

President

SUNY Polytechnic Institute

Ohio State University

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

39 Scopus citations

Abstract

The fatigue crack growth behavior of an experimental, single crystal alloy, of equivalent nominal chemical composition to Inconel 718 is presented. Fracture modes under cyclic loading were determined by scanning electron microscopy. The results of the fractographic analyses are presented on a fracture mechanism map that shows the dependence of the fatigue fracture mechanisms on the maximum stress intensity factor, K_max, and the stress intensity factor range, ΔK. Crack-tip deformation mechanisms associated with fatigue crack growth were studied using transmission electron microscopy. The relative effects of ΔK and K_max on the fatigue crack growth behavior of this material are discussed within the context of a two-parameter crack growth law. The influence of grain boundaries on the fatigue crack growth resistance of materials such as Inconel 718 is also discussed in light of the results of this investigation.

Original language	English
Pages (from-to)	2727-2740
Number of pages	14
Journal	Acta Materialia
Volume	47
Issue number	9
DOIs	https://doi.org/10.1016/S1359-6454(99)00123-8
State	Published - Jul 9 1999

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title = "Micromechanisms of fatigue crack growth in a single crystal Inconel 718 nickel-based superalloy",

abstract = "The fatigue crack growth behavior of an experimental, single crystal alloy, of equivalent nominal chemical composition to Inconel 718 is presented. Fracture modes under cyclic loading were determined by scanning electron microscopy. The results of the fractographic analyses are presented on a fracture mechanism map that shows the dependence of the fatigue fracture mechanisms on the maximum stress intensity factor, Kmax, and the stress intensity factor range, ΔK. Crack-tip deformation mechanisms associated with fatigue crack growth were studied using transmission electron microscopy. The relative effects of ΔK and Kmax on the fatigue crack growth behavior of this material are discussed within the context of a two-parameter crack growth law. The influence of grain boundaries on the fatigue crack growth resistance of materials such as Inconel 718 is also discussed in light of the results of this investigation.",

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AU - Mercer, C.

AU - Soboyejo, A. B.O.

AU - Soboyejo, W. O.

PY - 1999/7/9

Y1 - 1999/7/9

N2 - The fatigue crack growth behavior of an experimental, single crystal alloy, of equivalent nominal chemical composition to Inconel 718 is presented. Fracture modes under cyclic loading were determined by scanning electron microscopy. The results of the fractographic analyses are presented on a fracture mechanism map that shows the dependence of the fatigue fracture mechanisms on the maximum stress intensity factor, Kmax, and the stress intensity factor range, ΔK. Crack-tip deformation mechanisms associated with fatigue crack growth were studied using transmission electron microscopy. The relative effects of ΔK and Kmax on the fatigue crack growth behavior of this material are discussed within the context of a two-parameter crack growth law. The influence of grain boundaries on the fatigue crack growth resistance of materials such as Inconel 718 is also discussed in light of the results of this investigation.

AB - The fatigue crack growth behavior of an experimental, single crystal alloy, of equivalent nominal chemical composition to Inconel 718 is presented. Fracture modes under cyclic loading were determined by scanning electron microscopy. The results of the fractographic analyses are presented on a fracture mechanism map that shows the dependence of the fatigue fracture mechanisms on the maximum stress intensity factor, Kmax, and the stress intensity factor range, ΔK. Crack-tip deformation mechanisms associated with fatigue crack growth were studied using transmission electron microscopy. The relative effects of ΔK and Kmax on the fatigue crack growth behavior of this material are discussed within the context of a two-parameter crack growth law. The influence of grain boundaries on the fatigue crack growth resistance of materials such as Inconel 718 is also discussed in light of the results of this investigation.

UR - https://www.scopus.com/pages/publications/0032636472

U2 - 10.1016/S1359-6454(99)00123-8

DO - 10.1016/S1359-6454(99)00123-8

M3 - Article

SN - 1359-6454

VL - 47

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EP - 2740

JO - Acta Materialia

JF - Acta Materialia

IS - 9

ER -

Micromechanisms of fatigue crack growth in a single crystal Inconel 718 nickel-based superalloy

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