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Title: The Rehbinder effect in iron during giga-cycle fatigue loading

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.
Authors:
;  [1]
  1. Institute of Continuous Media Mechanics UrB RAS, Perm, 614013 (Russian Federation)
Publication Date:
OSTI Identifier:
22492511
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1683; Journal Issue: 1; Conference: International conference on advanced materials with hierarchical structure for new technologies and reliable structures 2015, Tomsk (Russian Federation), 21-25 Sep 2015; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
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