LOW CYCLE FATIGUE BEHAVIOUR OF NICKEL BASE SUPERALLOYS IN713 LC AND MAR-M-247 HIP AT ELEVATED TEMPERATURE

0444779 - ÚFM 2016 RIV eng A - Abstract
Šulák, Ivo - Obrtlík, Karel
LOW CYCLE FATIGUE BEHAVIOUR OF NICKEL BASE SUPERALLOYS IN713 LC AND MAR-M-247 HIP AT ELEVATED TEMPERATURE.
Book of Abstracts. Lausanne: Federation of european materials societies, 2014 - (Hofmann, M.)
[Junior Euromat 2014. 21.07.2014-25.07.2014, Lausanne]
R&D Projects: GA MŠMT(CZ) EE2.3.20.0214
Institutional support: RVO:68081723
Keywords : IN713LC LG * MAR-M247 * High Temperature * Low Cycle Fatigue
Subject RIV: JL - Materials Fatigue, Friction Mechanics
http://www.dgm.de/tagungen/?tgnr=1511&cat=prg&edate=25.07.2014&lg=en&op=us

Despite the fact that first generation nickel base superalloy IN 713 LC (low carbon) is used more than 50 years it is still desired alloy in the aircraft gas turbine market because of its outstanding high temperature properties and also low price. Hot isostatically pressed alloy MAR-M-247 HIP is one of the second generation nickel base superalloys that can replace the IN713 LC and become a leading alloy for gas turbine aircraft engines. In the present work, isothermal low cycle fatigue (LCF) of polycrystalline nickel base superalloy IN713LC LG (low grain) and MAR-M-247 HIP was studied. Microstructure and fracture surface of both alloys were studied using optical (OP) and scanning electron microscopy (SEM). The microstructure of the materials is characterized by dendritic grains, carbides and casting defects. Size and morphology of precipitates was evaluated. Fractographic observation has been made with the aim to reveal the fatigue crack initiation place, its kind and relation to the casting defects and material microstructure. Cylindrical specimens were undertaken LCF tests under total strain control at 900°C in air. Cyclic stress–strain response and fatigue life of both materials were assessed.
Permanent Link: http://hdl.handle.net/11104/0247263