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Abstract

The influence of stress rate on load/strain partitioning between different phases of a micro-alloyed 2.25Cr–Mo steel during stress-controlled fatigue deformation at room temperature (RT) was studied by conducting asymmetrical ratcheting fatigue tests employing values of 50–450 MPa/s. Fatigue life (N_f) significantly reduced for tests conducted by employing = 50 MPa/s compared to 450 MPa/s, i.e. N_f= 510 and 24,983 cycles respectively. From TEM studies, it is confirmed that due to load/strain partitioning stacking faults (SFs)/micro-twin formed in M₂₃C₆ carbides during high fatigue deformation, whereas dislocation cells are formed in low fatigue deformation. A plausible explanation to account for different cycle life with change in of fatigue deformation is offered.

Keywords

Cyclic strain defects fatigue life stacking faults microstructure micro-twin

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Strain partitioning between matrix and precipitates during fatigue deformation of 2.25Cr–Mo steel

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