The Rehbinder effect in iron during giga-cycle fatigue loading

Journal Article · Tue Oct 27 00:00:00 EDT 2015 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.4932711· OSTI ID:22492511

Naimark, O. B. ^[1]

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1. Institute of Continuous Media Mechanics UrB RAS, Perm, 614013 (Russian Federation)

The influence of the adsorptive strength reduction effect (the Rehbinder effect) on the fatigue life of pure iron under the giga-cycle loading regime was investigated. Specimens were loaded by an ultrasonic testing machine with a frequency of 20 kHz in air and in contact with eutectic alloy of gallium with tin and indium. A significant (by several orders of magnitude) worsening of the life-time of iron in contact with a molten metal as compared with tests in air was established. The liquid metal penetrates into the material to a depth of 200 μm to the center of a fatigue crack. The mechanism of the fatigue crack initiation in the giga-cycle regime of loading in contact with a surfactant is differing: the crack is formed on the surface of the specimen rather than within it as is the case for air. Based on the electron and optical microscopy data for the fracture surface, it can be concluded that exactly the change in the crack initiation mechanism reduces the fatigue life of iron in contact with a liquid metal because the initiated crack propagates regardless of the surfactant.

• OSTI ID: 22492511
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1683; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AIR
COMPARATIVE EVALUATIONS
CRACK PROPAGATION
CRACKS
ELECTRON MICROSCOPY
EUTECTICS
FATIGUE
FRACTURES
GALLIUM ALLOYS
INDIUM ALLOYS
IRON
KHZ RANGE 01-100
LIQUID METALS
LOADING
OPTICAL MICROSCOPY
SURFACES
SURFACTANTS
TIN ALLOYS
ULTRASONIC TESTING