0432553 - ÚFM 2015 RIV CH eng J - Journal Article
Polák, Jaroslav - Petráš, Roman - Heczko, Milan - Kuběna, Ivo - Kruml, Tomáš - Chai, G.
Low cycle fatigue behavior of Sanicro25 steel at room and at elevated temperature.
Materials Science and Engineering A Structural Materials Properties Microstructure and Processing. Roč. 615, OKT (2014), s. 175-182. ISSN 0921-5093. E-ISSN 1873-4936
R&D Projects: GA ČR(CZ) GA13-23652S
Institutional support: RVO:68081723
Keywords : Sanicro 25 steel * Cyclic plasticity * Dislocation structure * Fatigue life * Effect of temperature
Subject RIV: JL - Materials Fatigue, Friction Mechanics
Impact factor: 2.567, year: 2014

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.
Permanent Link: http://hdl.handle.net/11104/0237000