Effect of Pt–Al bond coat on the high-cycle fatigue behaviour of a second-generation single crystal nickel-based superalloy at different temperatures

• DOI: 10.1016/j.jmrt.2021.06.091
• Publication Date: 2021-07-02T03:35:45Z
• Authors: X.P. Tao; X.G. Wang; Y.Z. Zhou; K.J. Tan; J. Meng; J.J. Liang; Y.H. Yang; J.L. Liu; J.D. Liu; J.G. Li; X.F. Sun
• Keywords: Lüders band; Brittleness

High-cycle fatigue tests of Pt–Al bond coated and bare single crystal superalloys were conducted at 700 °C 800 °C, aiming investigating the effect coat on high-cycle properties a superalloy. The impact was studied merely tensile creep this superalloy, but not found behavior alloy. experimental results showed that to be beneficial or under low stresses owing fact cracks retarded by fine grains in IDZ, P-type rafted γ′ phases substrate coat/substrate interface, respectively. However, detrimental high rapid propagation early cracking brittle nature coat. Moreover, EBSD all mainly initiated surface specimens started from with {123}<111> slip system within Fatigue tested samples comparatively higher Schmid factor value than °C. Following test, TEM indicated superalloy close coat, dislocation networks formed due activity various systems °C; 450 MPa region, special a0<010> superdislocation two segments compact core observed phases.