Lifetime, cyclic deformation and damage behaviour of MAR-M-247 CC Under in-Phase, out-of-Phase and phase-Shift TMF-Loadings

Investigation of damage mechanisms and short fatigue crack growth during thermomechanical fatigue loading of the nickel‐based superalloy Inconel 100

“…Various publications address the influence of different TMF loading histories, like in-phase (IP), out-ofphase (OP), and phase shift (PS) loading on the lifetimes of cast polycrystalline nickel-based superalloys under uniaxial loading. [1][2][3][4][5] The publications show a trend: IP loading results in lower lifetimes than OP loading under high mechanical strains. For low mechanical strains, this trend seems to be inverted.…”

“…For low mechanical strains, this trend seems to be inverted. One explanation for this behavior is the higher amount of creep damage during IP loading at high mechanical strain amplitudes.The authors of several publications [1][2][3][4][5][6][7] analyzed the crack path after the experiments were finished by means of metallographic sections of the tested specimens. In contrast, in other references, 8,9 the potential drop technique was used to follow low cycle fatigue (LCF) short crack growth during the test.…”

“…This in turn supports the improvement of lifetime prediction concepts of gas turbine components under various TMF phases. Various publications address the influence of different TMF loading histories, like in‐phase (IP), out‐of‐phase (OP), and phase shift (PS) loading on the lifetimes of cast polycrystalline nickel‐based superalloys under uniaxial loading 1–5 . The publications show a trend: IP loading results in lower lifetimes than OP loading under high mechanical strains.…”

Interaction of thermally induced and mechanical fatigue

“…During the recent decades extensive research has been performed on the behavior of cast aluminum and iron alloys for internal combustion engines as well as on cast and wrought Nickel alloys for gas turbine applications, e.g. [9][10][11][12][13][14][15][16][17][18].…”

Influence of dwell times on the thermomechanical fatigue behavior of a directionally solidified Ni-base superalloy

“…More recently, microtwin deformation at intermediate temperatures was observed which may also result in anisotropic deformation behavior [16]. Dwell times representing steady state service typically reduce the lifetime of Ni-base superalloys in TMF or isothermal fatigue tests [17][18][19]; however positive effects have also been reported [20,21]. Because of the high costs of DS Ni-base alloys, laboratory tests are rare and only few literature data about their behavior under near service conditions are available.…”