Initiation and propagation of fatigue cracks in cast IN713LC superalloy

0353457 - ÚFM 2011 RIV GB eng J - Článek v odborném periodiku
Kunz, Ludvík - Lukáš, Petr - Konečná, R.
Initiation and propagation of fatigue cracks in cast IN713LC superalloy.
Engineering Fracture Mechanics. Roč. 77, č. 11 (2010), s. 2008-2015. ISSN 0013-7944. E-ISSN 1873-7315
Grant CEP: GA MPO FT-TA4/023; GA AV ČR 1QS200410502
Výzkumný záměr: CEZ:AV0Z20410507
Klíčová slova: IN 713LC * high temperature fatigue * crystallographic fatigue crack initiation * mean stress effect
Kód oboru RIV: JL - Únava materiálu a lomová mechanika
Impakt faktor: 1.571, rok: 2010

Fatigue life, initiation and propagation of cracks at 800 °C in a cast Ni-base superalloy IN 713LC were experimentally studied in high-cycle fatigue region. Load symmetrical cycling and cycling with high tensile mean load were applied. Both crystallographic crack initiation resulting in long Stage I crack growth and non-crystallographic Stage II propagation were observed. High scatter of fatigue life data was explained by (i) variability in microstructural conditions for crystallographic crack initiation and propagation and by (ii) influence of casting defect size distribution. The fractographic observation supports the slip band decohesion mechanism of crack initiation and an important role of cyclic slip localization in persistent slip bands.
Trvalý link: http://hdl.handle.net/11104/0192703