Abstract
In this study, the fatigue crack damage evolution procedure of AISI 4340 high-strength steel was systematically studied via three-dimensional X-ray technology and scanning electron microscopy. Based on the experimental results and theoretical analysis, a new FCG mechanism is proposed, i.e. the blunting and re-sharpening to micro-scale void coalescence (BRS-MVC) mixed mechanism. Few micro-scale voids initiated near the crack tip are surrounded by the blunting crack tip at low ΔK zone, which is controlled by the BRS mechanism. More micro-scale void clusters would occur around the crack tip at high ΔK zone, which may be attributed to the MVC mechanism. The new FCG mechanism provides a unique perspective for the FCG behavior of high-strength steels, which could promote the fatigue life prediction of metallic materials.
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