Cyclic damage behavior of Sanicro 25 alloy at 700 °C: Dispersed damage and concentrated damage

Cyclic deformation behavior and fatigue life prediction of an automotive cast aluminum alloy: A new method of determining intrinsic fatigue toughness

“…Silafont®‐36 alloy and Al‐5.5Mg‐2.5Si‐0.6Mn‐0.2Fe cast alloy also have equivalent cyclic yield strength and cyclic strain hardening exponent as well as cyclic strength coefficient within experimental scatter, which are somewhat lower than the values of A356‐T6 alloy. The cyclic strain hardening exponent ( n′ ) and cyclic strength coefficient ( K′ ) could be evaluated via the following relationship 8,18,37 : where Δ σ is the mid‐life stress range and Δ ε p is the corresponding mid‐life plastic strain range. Morrow 38 and Tomkins 39 proposed approximate expressions correlating b and c in Equation 1 to the cyclic strain hardening exponent as follows,…”

“…Fatigue life prediction using strain‐energy density approaches has been studied by several researchers, 17,18,23,37,43,44 and is essential in the case of strain‐controlled fatigue tests, as the plastic strain amplitude plays a dominant role in determining fatigue behavior, including the nature of fatigue damage. Wang et al 17,23 proposed a strain‐energy density expression for Al–Si hypereutectic piston alloy fatigued at room and elevated temperatures, considering the concept of accumulated damage, and found that the expression was linked to fatigue life ( N f ) nicely.…”

The effect of dwell on thermomechanical fatigue in superaustenitic steel Sanicro 25

“…The basic study of the low cycle fatigue with constant strain rate at constant ambient and high temperature of Sanicro 25 (isothermal fatigue [IF]) 33 and the study of its cyclic stress–strain response using statistical theory of the hysteresis loop 34 started a number of more thorough studies of this material. Transmission electron microscopy (TEM) was used to study the dislocation arrangement, 35 the sources of its extraordinary cyclic hardening 36 and the damage mechanisms at room and at elevated temperatures 23,37–43 …”

“…Transmission electron microscopy (TEM) was used to study the dislocation arrangement, 35 the sources of its extraordinary cyclic hardening 36 and the damage mechanisms at room and at elevated temperatures. 23,[37][38][39][40][41][42][43] Recently, also, considerable interest was paid to the damage mechanisms in Sanicro 25 during thermomechanical fatigue. 18,24,44 Considerably lower fatigue life was found in in-phase thermomechanical cycling (IP-TMF) when maximum temperature coincides with maximum tensile stress than in out-of-phase cycling (OP-TMF) when maximum temperature coincides with maximum compression stress.…”

The effect of dwell on thermomechanical fatigue in superaustenitic steel Sanicro 25

“…The original interest was devoted to the creep resistance 2,[4][5][6][7] Basic study of the low cycle fatigue at ambient and high temperature of Sanicro 25 8 and the study of its cyclic stress-strain response using statistical theory of the hysteresis loop 9 started a number of more thorough studies of this material. Transmission electron microscopy (TEM) was used to study the dislocation arrangement 10 , the sources of its extraordinary cyclic hardening 11 and damage mechanisms at room and at elevated temperatures [12][13][14][15][16][17][18][19] . Further study was devoted to the damage mechanisms in thermomechanical fatigue [20][21][22][23][24][25] .…”