Crack Initiation in Austenitic Stainless Steel Sanicro 25 Subjected to Thermomechanical Fatigue

Roman Petráš; Viktor Škorík; Jaroslav Polák

doi:10.4028/www.scientific.net/SSP.258.273

Paper Titles

The Influence of Microstructure Heterogeneities on the Very High Cycle Fatigue Behavior of Duplex Stainless Steel
p.255

Hydrogen-Induced Ductility Loss of Austenitic Stainless Steels for Slow Strain Rate Tensile Testing in High-Pressure Hydrogen Gas
p.259

Intrinsic Behaviour of Mode II and Mode III Long Fatigue Cracks in Zirconium and the Ti-6Al-4V Alloy
p.265

Grain Size Effect on Low Cycle Fatigue Behavior of High Strength Structural Materials
p.269

Crack Initiation in Austenitic Stainless Steel Sanicro 25 Subjected to Thermomechanical Fatigue
p.273

Deformation and Fracture of Metallic Nanowires
p.277

Method of Threshold Stress Determination for a Local Approach to Cleavage Fracture
p.281

Micromechanism of Thermally Induced Breaking of One-Dimensional Nanocrystals
p.286

Numerical Determination of Fatigue Threshold from CTOD
p.290

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Crack Initiation in Austenitic Stainless Steel Sanicro 25 Subjected to Thermomechanical Fatigue

Abstract:

Thermomechanical fatigue experiments were performed with austenitic stainless Sanicro 25 steel. Several amplitudes of mechanical strain in a wide temperature interval (250-700 °C) were applied to the specimens. Mechanical response was recorded and fatigue lives were obtained. Scanning electron microscopy combined with FIB technique was used to study the mechanism of crack initiation in in-phase and in out-of-phase thermomechanical cycling. Different mechanisms of the crack initiation were found in these two types of loading. During in-phase loading fatigue cracks start in grain boundaries by cracking of the oxide. Cracks grew preferentially along grain boundaries which resulted in rapid crack initiation and low fatigue life. In out-of-phase loading multiple cracks perpendicular to the stress axis developed only after sufficiently thick oxide layer was formed and cracked in low temperature loading half-cycle. The cracks in oxide allowed localized repeated oxidation and finally also cracking. The cracks grow transgranularly and result in longer fatigue life.

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Periodical:

Solid State Phenomena (Volume 258)

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273-276

DOI:

https://doi.org/10.4028/www.scientific.net/SSP.258.273

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Online since:

December 2016

Authors:

Roman Petráš*, Viktor Škorík, Jaroslav Polák

Keywords:

Damage Mechanism, FIB Cutting, Localized Oxidation-Cracking, Sanicro 25 Steel, Thermomechanical Fatigue

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