Investigation of high-cycle fatigue behavior in 300M steel with surface treatments, suggesting effective life prediction methods.
This study investigated the high‐cycle fatigue (HCF) behavior of 300M steel with shot peening (SP) followed by surface coatings (Cd/Ti plating, Cr plating, HVOF spraying) under axial stress control. Axial fatigue tests revealed that Untreated specimens exhibited the highest fatigue limit (845 MPa). SP alone slightly reduced the limit (−0.84%) due to the competing effects of surface roughness and compressive residual stress. SP + Cd/Ti minimally impacted HCF, while SP + Cr and SP + HVOF reduced fatigue limits by 7.12% and 6.73%, respectively. Post‐HVOF grinding restored fatigue strength by 20 MPa. The S‐N curves further highlighted that SP and Cd/Ti plating enhanced medium‐to‐high‐cycle fatigue life, but coatings like Cr plating and HVOF accelerated crack initiation. Fracture analysis showed SP shifted crack initiation to internal inclusions, while coatings induced interface cracks. A multifactor life prediction framework integrating surface treatment coefficients, roughness, and residual stress was developed, achieving predictions within ± 2.5 scatter bands.
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Tang et al. (2026) studied this question.