Determining cyclic corrosion cracking resistance for titanium alloys with allowance for electrochemical conditions at the fatigue corrosion crack tip

Journal Article · Mon Aug 01 04:00:00 EDT 1994 · Strength of Materials

OSTI ID:56886

Panasyuk, V V; Ratich, L V; Petranyuk, I Ya

Published data are examined on how various factors affect fatigue crack growth rates. Basic diagrams have been constructed for the cyclic cracking resistance in Ti-6Al-4V and Ti-6Al-2Sn alloys in air, distilled water, and 3.5% NaCl for use in working-life calculations. Appropriate heat treatment can produce two microstructures in a titanium alloy, one of which has the largest cyclic cracking resistance, while in the second, the cracks grow at the lowest rate. The cyclic corrosion cracking resistance for a titanium alloy should be determined in relation to the state of stress and strain and to the electrochemical conditions at the corrosion fatigue crack tip, while the variations in fatigue crack growth rate for a given stress intensity factor in a corrosive medium are due to differing electrochemical conditions at the crack tip during the testing on different specimens. Basic diagrams can be derived for titanium alloys by using a physically sound methodology developed previously for steels, which is based on invariant diagrams for cyclic cracking resistance in air and in the corresponding medium, which can be constructed in relation to extremal working and electrochemical conditions at corrosion-fatigue crack tips.

• OSTI ID: 56886
• Journal Information: Strength of Materials, Journal Name: Strength of Materials Journal Issue: 12 Vol. 25; ISSN 0039-2316; ISSN SMTLB5
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AIR
ALUMINIUM ALLOYS
CORROSION FATIGUE
CORROSION RESISTANCE
CRACK PROPAGATION
CRACKS
ELECTROCHEMICAL CORROSION
HEAT TREATMENTS
MICROSTRUCTURE
SODIUM CHLORIDES
TIN ALLOYS
TITANIUM BASE ALLOYS
VANADIUM ALLOYS
WATER