Low cycle fatigue performance of Ni-based superalloy coated with complex thermal barrier coating

High‐Temperature Low‐Cycle Fatigue Behaviour of MAR‐M247 Coated with Newly Developed Thermal and Environmental Barrier Coating

“…e YSZ/CoNiCrAlY interface is a significant crack initiation source in specimens that are exposed to 900°C longer than 36 h. As the oxidation proceeds and the TGO scale reaches critical thickness, it is probable that the cracks at the YSZ/CoNiCrAlY interface would be initiated by an increase in the local stresses [33][34][35]. Similarly to our previous studies [17,36], fatigue crack initiation at BC/substrate interface was identified in the vicinity of embedded grit particles (Figure 4(a)). It was proven by Warnes et al [27] that elimination of these particles can improve fatigue life of coated MAR-M247 under thermomechanical loading by 40%.…”

“…Factors that contribute to the higher fatigue life of TEBC-coated MAR-M247 are (i) increased number of cracks in the TEBC-coated material in comparison with uncoated MAR-M247. is suppresses the localization of the plastic strain, and thus, the fatigue crack initiation and propagation can be longer [36,41]; (ii) corrosion and oxidation protection of materials that are employed in harsh Advances in Materials Science and Engineering environments is very important. However, corrosion and oxidation resistance of MAR-M247 is comparatively poor due to the relatively low content of chromium, and the unprotected surface of uncoated MAR-M247 degrades quickly [42].…”

“…e ratio increases with a decrease in the strain amplitude. e ratio (cracks that penetrate to the substrate-TEBC-coated to uncoated MAR-M247) of 2.18 and 6.3 corresponds to the highest and lowest strain amplitude, respectively [17,36].…”

Critical Raw Materials Saving by Protective Coatings under Extreme Conditions: A Review of Last Trends in Alloys and Coatings for Aerospace Engine Applications

“…In gas turbines, actual components are not submitted to pure creep loading. In fact, due to the start-up and shut-down operations, transient temperature gradients occur, giving rise to combined thermal and mechanical loading [ 95 ], and therefore to thermal mechanical fatigue (TMF) and low cycle fatigue (LCF) [ 95 , 96 ]. High-temperature LCF in nickel-based alloys under air results in the formation of a complex oxide layer and a reaction zone depleted of strengthening precipitates in the adjacent substrate as in creep [ 97 ].…”

“…LCF performance of Ni-based superalloy coated with YSZ conventional thermal barrier coating have been rarely investigated. As reported by Šulák et al [ 96 ], results on studies on LCF of YSZ coated Ni superalloys are a bit controversial, showing in some case a beneficial [ 179 ], an insignificant [ 180 ], or a detrimental effect [ 181 ] on the fatigue life. In their work, Šulák et al have investigated the effect of high-temperature (900 °C) LCF performance of a complex TBC-coated and uncoated Inconel 713LC sample.…”