Biaxial in-phase and out-of-phase cyclic deformation and fatigue behavior of an austenitic TRIP steel
Source abstract
Abstract
Abstract The fatigue behavior of a metastable austenitic cast steel was studied under biaxial in-phase and out-of-phase cyclic deformation by using cruciform specimens. Different phase shifts φ between the principal strains in the range of φ = 0 ° (equibiaxial push–pull) and φ = 180 ° (pure shear) were investigated. Deformation induced martensitic phase transformation was observed after an incubation period and caused pronounced cyclic hardening depending on the plastic strain amplitude. No significant correlation between the phase shift φ and the martensite formation rate or the cyclic hardening rate was found. In tests with φ = 180 ° (shear) a slower martensite formation rate and a much higher number of cycles to failure were observed than in other biaxial and uniaxial tests. In out-of-phase tests ( φ = 22.5 ° , 45 ° , 90 ° , 135 ° ) similar fatigue lives were observed as in φ = 0 ° (equibiaxial) tests. The uniaxial Basquin–Manson-Coffin relationship is conservative for biaxial loading of the TRIP steel. Investigations of Surface cracks after fatigue failure lead to the assumption of different crack types under φ = 0 ° and φ = 180 ° loading according to [1] which cause the differences in the fatigue lives.
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Research context
OpenAlex topics: Microstructure and Mechanical Properties of Steels · Metallurgy and Material Forming · Metal Alloys Wear and Properties
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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