Damage Evolution in Thermomechanical Loading of Stainless Steel

0465508 - ÚFM 2017 RIV NL eng C - Conference Paper (international conference)
Petráš, Roman - Škorík, Viktor - Polák, Jaroslav
Damage Evolution in Thermomechanical Loading of Stainless Steel.
21st European Conference on Fracture. Amsterdam: Elsevier, 2016, 3407–3414. Procedia Structural Integrity, 2. ISSN 2452-3216.
[ECF21 - European Conference on Fracture /21./. Catania (IT), 20.06.2016-24.06.2016]
R&D Projects: GA MŠMT LM2015069; GA MŠMT(CZ) LQ1601; GA ČR(CZ) GA13-23652S
Institutional support: RVO:68081723
Keywords : Thermomechanical fatigue * Sanicro 25 steel * Damage mechanism * FIB cutting * Localized oxidation-cracking
Subject RIV: JL - Materials Fatigue, Friction Mechanics

Superaustenitic stainless steel Sanicro 25 has been subjected to in-phase and out-of-phase thermomechanical fatigue (TMF). Different amplitudes of mechanical strain and the changes of the temperature in the interval 250 to 700°C were applied to standard cylindrical specimens. Early fatigue damage has been studied using scanning electron microscopy combined with FIB cutting and EBSD imaging. TMF loading resulted first in developing thin oxide layer. In in-phase loading grain boundaries were preferentially oxidized and fatigue cracks developed by alternating oxidation and cracking. Fatigue cracks developed rapidly in oxidized grain boundaries and propagated intergranularly. During out-of-phase TMF loading the cracked oxide layer resulted in local oxidation and crack initiation. The crack grew transgranularly.
Permanent Link: http://hdl.handle.net/11104/0264189