Evaluation of very high cycle fatigue zones in 42CrMo4 steel with plate-like alumina inclusions
Source abstract
Abstract
Abstract Quenched and nitrided 42CrMo4 specimens, treated by different reactive filters were tested in very high cycle fatigue regime using ultrasonic method. Despite total alumina reduction fatigue limit showed no improvement due to large alumina plates whose parameters were studied. Areal roughness of fatigue crack zones was measured by confocal laser scanning microscopy. Periodic arrest marks were studied and used for crack growth rate calculation. Smooth area was experimentally defined as a zone between fine granular area and fisheye by imaging, roughness minima, fixed ΔK = 6.4 and crack growth rate of ∼10−10 m/cycle. Classification of internal crack zones is proposed.
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Research context
OpenAlex topics: Fatigue and fracture mechanics · Material Properties and Failure Mechanisms · Surface Treatment and Residual Stress
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