Abstract
We have examined fatigue crack propagation behavior in the [ferrite/bainite]-Hybrid materials with different hardness under a constant stress intensity factor range. It was found that crack propagation in the ferrite phase decelerated with reaching to the [ferrite/bainite]-interface, probably due to supression of plastic deformation at the crack tip. This suppression tendency of the crack propagation became higher when hardness difference between ferrite and bainite was larger. In the case with the highest hardness difference, fatigue crack did not pass through the [ferrite/bainite]-interface. Lower crack propagation rate was also found in the bainite which showed higher work softening due to crack propagation.
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