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Influence of new thermal and environmental barrier coating on the thermomechanical fatigue behaviour of nickel-base superalloy MAR-M247

In this paper, the effect of a newly developed thermal and environmental barrier coating (TEBC) for high temperature applications on thermomechanical fatigue (TMF) of polycrystalline nickel-base superalloy MAR-M247 is reported. The TEBC consisting of an Al6Si2O13 + MgAl2O4 + BaCO3 upper-most layer, well known partially yttria-stabilized zirconia (YSZ) interlayer, and a CoNiCrAlY bond coat which possesses a high potential to resist Calcia-Magnesia-Alumino-Silicate (CMAS) environmental attack. The metallic CoNiCrAlY bond coat was deposited directly onto MAR-M247 superalloy to bridge the gap between the mechanical properties of the nickel superalloy and the ceramic coating. TMF tests were performed in strain control mode…

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In this paper, the effect of a newly developed thermal and environmental barrier coating (TEBC) for high temperature applications on thermomechanical fatigue (TMF) of polycrystalline nickel-base superalloy MAR-M247 is reported. The TEBC consisting of an Al6Si2O13 + MgAl2O4 + BaCO3 upper-most layer, well known partially yttria-stabilized zirconia (YSZ) interlayer, and a CoNiCrAlY bond coat which possesses a high potential to resist Calcia-Magnesia-Alumino-Silicate (CMAS) environmental attack. The metallic CoNiCrAlY bond coat was deposited directly onto MAR-M247 superalloy to bridge the gap between the mechanical properties of the nickel superalloy and the ceramic coating. TMF tests were performed in strain control mode with constant mechanical strain amplitude on both uncoated and TEBC coated superalloy. In-phase (IP) and out-of-phase (OP) loading cycles were applied in the temperature range of 773-1173 K. A heating and cooling rate was 5 K/s. Fatigue hardening/softening curves, cyclic stress-strain curves, and fatigue life curves in the representation of total strain amplitude, plastic strain amplitude and stress amplitude on the number of cycles to failure were obtained. The beneficial effect of TEBC on fatigue lifetime was found for IP loading, while a decrease in fatigue lifetime was found in the case of OP loading. SEM microstructural examinations along with TEM observation of dislocation arrangement at after the TMF loading facilitate the discussion of obtained results.

Reference
LCF9-2022-105

Title
Influence of new thermal and environmental barrier coating on the thermomechanical fatigue behaviour of nickel-base superalloy MAR-M247
Author(s)
I. Šulák, K. Obrtlík, L. Čelko
DOI
10.48447/LCF9-2022-105
Event
LCF9 - Ninth International Conference on Low Cycle Fatigue
Year of publication
2022
Publication type
conference paper (PDF)
Language
English
Keywords
In-Phase,Out-of-Phase,Nickel-based superalloy,Thermal and environmental barrier coating,High temperature fatigue