Creep behavior of Pt-aluminide (PtAl) coated directionally solidified Ni-based superalloy CM-247LC after thermal exposure

Effect of Pt on Stress Rupture Properties of Pt-Modified Nickel Aluminide Coatings at 1100 °C

“…As presented in Figure5a1-2 , multi-layered mixed oxides form on the surface of the alloy, and an Al-depleted zone is found beneath it, where the γ/γ ′ coherent structure disappeared. Moreover, many γ ′ rafts oriented perpendicular to the direction of the loading stress appear close to the Al-depleted zone (Figure5a3 ), which is commonly in the literature[12,13]. As exhibited in Figure5b1-2 , the cracks of the 0 Pt coating generate from the surface micro defects, propagate perpendicular to the direction of the stress, and eventually abort at the OZ/IDZ interface, where numerous microvoids exist (Figure5b3 ).…”

“…Currently, researchers have also conducted some studies on the failure behavior of PtAl coatings under complex muti-field coupling environments [8][9][10][11][12][13][14][15][16][17]. Most of them concentrated on the impact of different loading conditions, such as tension [8][9][10][11], creep [9][10][11][12][13][14][15], fatigue [16][17][18], and thermo-mechanical fatigue [19], on the mechanical properties of PtAl coatings from room temperature to the service temperature. In general, except for high-cycle fatigue at a high temperature, depositing the PtAl coating would decrease the mechanical strength of the substrate superalloy but improve its ductility at elevated temperatures.…”

Type-I Hot Corrosion of Ni-Base Superalloy CM247LC in Presence of Molten Na2SO4 Film

“…This alloy is optimized for casting of turbine blades and vanes operating in the hot sections of advanced gas turbine engines and has a maximum temperature capability of 1000°C. [21][22][23][24][25] Reports on the hot corrosion behavior of the above alloy are limited in the open literature. [26][27][28] Gurrappa examined the comparative corrosion behavior of CM247LC immersed in pure Na 2 SO 4 and Na 2 SO 4 -NaCl mixture over a temperature range from 700°C to 1000°C…”