Defects initiating fatigue faults in granular alloy EP741NP (part II)

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Abstract

Serial section focused ion beam tomography was performed for a three-dimensional reconstruction of the microstructure of defects associated with the formation of fatigue cracks in samples destroyed during fatigue tests. The geometric parameters of defects containing Hf, Nb, Ti, Al, and Ni identified during 3D reconstruction were determined. The morphology of individual particles is represented by a set of shapes that form flat (carpet-like) conglomerates up to tens of microns in size, which cannot be detected by non-destructive testing methods. The revealed morphological features make it possible to propose a set of measures to increase the service life of parts made of granulated heat-resistant nickel alloy EP741NP, which is an important practical result of the study.

About the authors

V. V. Artemov

Shubnikov Institute of Crystallography of the Kurchatov Complex Crystallography and Photonics of the NRC “Kurchatov Institute”

Moscow, 119333 Russia

V. I. Bondarenko

Shubnikov Institute of Crystallography of the Kurchatov Complex Crystallography and Photonics of the NRC “Kurchatov Institute”

Moscow, 119333 Russia

M. A. Artamonov

Lyulka Experimental Design Bureau, Branch of PJSC "UEC-UMPO"

Moscow, Russia

A. S. Kumskov

Shubnikov Institute of Crystallography of the Kurchatov Complex Crystallography and Photonics of the NRC “Kurchatov Institute”

Moscow, 119333 Russia

I. S. Pavlov

Shubnikov Institute of Crystallography of the Kurchatov Complex Crystallography and Photonics of the NRC “Kurchatov Institute”

Moscow, 119333 Russia

E. Y. Marchukov

Lyulka Experimental Design Bureau, Branch of PJSC "UEC-UMPO"

Moscow, Russia

A. L. Vasiliev

Shubnikov Institute of Crystallography of the Kurchatov Complex Crystallography and Photonics of the NRC “Kurchatov Institute”; Moscow Institute of Physics and Technology (National Research University)

Email: a.vasiliev56@gmail.com
Moscow, 119333 Russia; Dolgoprudny, Russia

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