Low cycle fatigue behavior of Sanicro25 steel at room and at elevated temperature

Austenitic heat resistant Sanicro 25 steel developed for high temperature applications in power generation industry has been subjected to strain controlled low cycle fatigue tests at ambient and at elevated temperature in a wide interval of strain amplitudes. Fatigue hardening/softening curves, cycl...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2014-10, Vol.615, p.175-182
Main Authors: Polák, Jaroslav, Petráš, Roman, Heczko, Milan, Kuběna, Ivo, Kruml, Tomáš, Chai, Guocai
Format: Article
Language:English
Subjects:
Applied sciences
Condensed matter: structure, mechanical and thermal properties
Cyclic plasticity
Defects and impurities in crystals
microstructure
Dislocation structure
Dislocations
Effect of temperature
Elasticity. Plasticity
Exact sciences and technology
fataigue life
Fatigue
Fatigue (materials)
Fatigue life
Fractures
Grain and twin boundaries
High temperature
Low cycle fatigue
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Physics
Sanicro 25 steel
Softening
Strain
Structural steels
Structure of solids and liquids
crystallography
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Summary:Austenitic heat resistant Sanicro 25 steel developed for high temperature applications in power generation industry has been subjected to strain controlled low cycle fatigue tests at ambient and at elevated temperature in a wide interval of strain amplitudes. Fatigue hardening/softening curves, cyclic stress–strain curves and fatigue life curves were evaluated at room temperature and at 700°C. The internal dislocation structures of the material at room and at elevated temperature were studied using transmission electron microscopy. High resolution surface observations and FIB cuts revealed early damage at room temperature in the form of persistent slip bands and at elevated temperature as oxidized grain boundary cracks. Dislocation arrangement study and surface observations were used to identify the cyclic slip localization and to discuss the fatigue softening/hardening behavior and the temperature dependence of the fatigue life.
ISSN:0921-5093
1873-4936
1873-4936
DOI:10.1016/j.msea.2014.07.075