Effect of microscopic residual stress on the characteristics on fatigue crack propagation of lamellar-microstructure steel

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A numerical simulation method to calculate microscopic residual stress distribution in lamellar microstructure steel was developed. The calculated microscopic residual stress was compressive in martensite phase and tensile in ferrite phase. Fatigue crack propagation path observed in experiments is reasonable in terms of the simulated results. Crack propagation analysis method under microscopic residual stress state was also developed. It was shown that the crack propagation rate decreases when compressive residual stress exists in martensitic phase.