Life assessment of SiMo 4.06 cast iron under LCF and TMF loading conditions

Control of High-Temperature Static and Transient Thermomechanical Behavior of SiMo Ductile Iron by Al Alloying

“…Ferritic SiMo ductile cast iron contains 3.5-5.1% silicon and 0.4-1.1% molybdenum (wt.%), which is commonly used for high-temperature applications primarily because of its good thermomechanical properties, resistance to high-temperature oxidation, and castability. [1][2][3] One version of this alloy, designated as SiMo51 ductile iron, contains near 3.1% C, 4.1% Si, 0.4% Mn, 0.8% Mo, and 0.05% Mg and is commonly used in the manufacture of exhaust manifolds. [1][2][3][4][5] In addition to being exposed to harsh high-temperature oxidizing environments, manifolds are subjected to the thermomechanical loadings during thermal cycling at mechanically constrained conditions.…”

“…[1][2][3] One version of this alloy, designated as SiMo51 ductile iron, contains near 3.1% C, 4.1% Si, 0.4% Mn, 0.8% Mo, and 0.05% Mg and is commonly used in the manufacture of exhaust manifolds. [1][2][3][4][5] In addition to being exposed to harsh high-temperature oxidizing environments, manifolds are subjected to the thermomechanical loadings during thermal cycling at mechanically constrained conditions. When these types of situations occur, there is a self-generated stress and strain condition, which is a function of both intrinsic (thermal expansion, heat conductivity and mechanical properties of material) and extrinsic (thermal load, component geometry) conditions.…”

Use of Prandtl operators in simulating the cyclic softening of Inconel 718 under isothermal low-cycle fatigue loading

“…Low-Cycle Fatigue (LCF) may be induced if the temperature does not change significantly during loading cycles, whereas thermo-mechanical fatigue should be considered for the loading cycles with variable temperatures [6,7,8]. A quantification of the stress-strain response forms a pre-requisite for accurate lifetime predictions, which are increasingly important in order to guarantee the safety and reliability of these components [9,10].…”

A new approach to finite element modelling of cyclic thermomechanical stress-strain responses

“…Such conditions can cause considerable plastic deformation of a component due to either high mechanical loads or moderate mechanical loads combined with elevated temperatures, both of which exceed the yield stress of the material [2,[11][12][13]. If plastic deformation varies due to variable work conditions (start-up, full and partial loads, shut-down), the component is subjected to low-cycle fatigue which can eventually result in failure [2,6,14].…”