Effect of Microstructural Features of Titanium Alloys on Fatigue Properties and Mechanism of Crack Nucleation in Region of Very High Cycle Fatigue

This work considers the problem of subsurface fatigue crack nucleation and decrease in fatigue properties in two-phase titanium alloys at very high cycle fatigue (VHCF). Analysis of microstructure of alloy VT3-1 obtained by two different technological processes, punching and extrusion, is performed....

Full description

Saved in:
Bibliographic Details
Published in:Inorganic materials : applied research 2018, Vol.9 (4), p.612-619
Main Authors: Nikitin, A. D., Shanyavskii, A. A., Beklemishev, N. N., Porokhov, V. V., Barsegyan, O. S.
Format: Article
Language:English
Subjects:
Chemistry
Chemistry and Materials Science
Crack initiation
Crack propagation
Extrusion
Fatigue failure
Fracture mechanics
High cycle fatigue
Industrial Chemistry/Chemical Engineering
Inhomogeneity
Inorganic Chemistry
Materials fatigue
Materials Science
Metal fatigue
Microstructure
Nonmetallic inclusions
Nucleation
Structural members
Titanium alloys
Titanium base alloys
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:This work considers the problem of subsurface fatigue crack nucleation and decrease in fatigue properties in two-phase titanium alloys at very high cycle fatigue (VHCF). Analysis of microstructure of alloy VT3-1 obtained by two different technological processes, punching and extrusion, is performed. It is shown that main features of the microstructure of alloy VT3-1 are inhomogeneity of size and shape of the structural elements of the α phase. Agglomerations of globular structural elements of the α phase as well as “macrozones” of acicular plates are found for the forged alloy. As for the extruded VT3-1 it is shown that the inhomogeneity of the microstructure is connected with the regions where acicular plates of the α phase are formed within the primary β grains. In this case, their direction does not coincide with the direction of extrusion. Nonmetallic inclusions are found neither in the forged nor in the extruded titanium alloy VT3-1.
ISSN:2075-1133
2075-115X
DOI:10.1134/S207511331804024X