Počet záznamů: 1  

Initiation and growth of short fatigue cracks in austenitic Sanicro 25 steel

  1. 1.
    0492026 - ÚFM 2019 RIV US eng J - Článek v odborném periodiku
    Mazánová, Veronika - Polák, Jaroslav
    Initiation and growth of short fatigue cracks in austenitic Sanicro 25 steel.
    Fatigue and Fracture of Engineering Materials and Structures. Roč. 41, č. 7 (2018), s. 1529-1545. ISSN 8756-758X
    Grant CEP: GA MŠk LM2015069; GA MŠk(CZ) LQ1601; GA MŠk LM2015069; GA ČR GA15-08826S; GA ČR(CZ) GA13-23652S
    Institucionální podpora: RVO:68081723
    Klíčová slova: austenitic steel * crack growth * crack growth coefficient * crack initiation * EBSD * equivalent crack
    Kód oboru RIV: JL - Únava materiálu a lomová mechanika
    Obor OECD: Audio engineering, reliability analysis
    Impakt faktor: 2.555, rok: 2018

    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.
    Trvalý link: http://hdl.handle.net/11104/0286799
Počet záznamů: 1