Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 707, Issue -, Pages 125-135Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2017.09.035
Keywords
Rail steel; Low cycle fatigue; Masing behaviour; Plastic strain energy; Fatigue toughness
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Funding
- Management of R & D Centre for Iron & Steel, Steel Authority of India Limited
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Strain-controlled low cycle fatigue tests were performed on 60 kg/m 90-UTS plain C-Mn rail steel with fully pearlitic microstructure. Analysis of hysteresis loop shape and properties revealed that the steel deviated from the ideal Masing type material behaviour to a little extent. To evaluate the fatigue damage in rail steel, energy based analytical approach proposed by Morrow based on Masing hypothesis was employed. The Morrow energy model resulted in reasonably good approximation of both average plastic strain energy and fatigue life in comparison to experimentally observed values. In addition to that the plastic strain energy density (Delta W-p) was correlated to fatigue life (2N(f)) through a simple power law and very well represented by Coffin-Mansion type relationship similar to conventional strain-life (Delta epsilon(p) - 2N(f)) relationship. Finally, the concept of fatigue toughness, an energy parameter, was introduced to life prediction in rail steel which was proved to be a suitable and reliable alternative to strain-life approach in fatigue damage evaluation with high degree of accuracy.
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