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Initiation and growth of short fatigue cracks in austenitic Sanicro 25 steel
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SYSNO ASEP 0492026 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Initiation and growth of short fatigue cracks in austenitic Sanicro 25 steel Author(s) Mazánová, Veronika (UFM-A)
Polák, Jaroslav (UFM-A) RID, ORCIDNumber of authors 2 Source Title Fatigue and Fracture of Engineering Materials and Structures - ISSN 8756-758X
Roč. 41, č. 7 (2018), s. 1529-1545Number of pages 17 s. Publication form Print - P Language eng - English Country US - United States Keywords austenitic steel ; crack growth ; crack growth coefficient ; crack initiation ; EBSD ; equivalent crack Subject RIV JL - Materials Fatigue, Friction Mechanics OECD category Audio engineering, reliability analysis R&D Projects LM2015069 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) LQ1601 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) LM2015069 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) GA15-08826S GA ČR - Czech Science Foundation (CSF) GA13-23652S GA ČR - Czech Science Foundation (CSF) Institutional support UFM-A - RVO:68081723 UT WOS 000434273100007 DOI 10.1111/ffe.12794 Annotation Austenitic heat‐resistant stainless steel Sanicro 25, often used in energy production
installations, was cyclically strained at room temperature, and initiation
and growth of short fatigue cracks have been studied. Cylindrical specimens
with pre‐existing shallow notch were cyclically strained under constant total
strain amplitudes, while the surface relief, crack initiation, and short crack
growth were observed, in‐situ, using optical and electron microscopes.
Persistent slip markings were found to be the principal locations where natural
fatigue cracks initiated. The character of the crack paths of short cracks was
studied using SEM and EBSD techniques. The results exhibit prevailing
transgranular crack growth, ie, along the persistent slip markings within the
grains. The growth of the largest cracks in the central part of the shallow notch
was measured for different applied strain amplitudes. Because the coalescence
of initiated cracks plays a significant role during crack growth, the use of the
“equivalent crack” concept gives adequate results in the description of the crack
growth rate. The crack growth law of short cracks was established and
compared with the Manson‐Coffin law of the material.Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2019
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