Relation between the fracture laws and the fatigue life of a surface-hardened pseudo-α titanium alloy

Relation between the fracture laws and the fatigue life of a surface-hardened pseudo-α titanium alloy

The laws of fracture and fatigue life of the PT-3V pseudo-α titanium alloy subjected to surface hardening using electromechanical, ultrasonic, and combined treatment are studied. Fracture mechanisms and the structures of crack nucleation and growth zones are described using the results of metallogra...

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Bibliographic Details
Published in:Russian metallurgy Metally Vol. 2016; no. 7; pp. 663 - 668
Main Authors: Bagmutov, V. P., Vodop’yanov, V. I., Zakharov, I. N., Denisevich, D. S.
Format: Journal Article
Language:English
Published: Moscow Pleiades Publishing 01-07-2016
Subjects:
Chemistry and Materials Science
Crack initiation
Crack propagation
Fatigue life
Fatigue tests
Fracture mechanics
Fracturing
Materials Science
Metallic Materials
Thin films
Titanium base alloys
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Summary:The laws of fracture and fatigue life of the PT-3V pseudo-α titanium alloy subjected to surface hardening using electromechanical, ultrasonic, and combined treatment are studied. Fracture mechanisms and the structures of crack nucleation and growth zones are described using the results of metallographic and fractographic analysis of samples after fatigue tests. It is shown that the existence of a thin hardened layer on the sample surface changes the crack nucleation time and the state of fracture surface in the crack nucleation zone. This surface is characterized by signs of brittle or ductile fracture, which substantially affects the fatigue life of the sample.
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ISSN:0036-0295
1555-6255
DOI:10.1134/S0036029516070053