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Fatigue crack growth behavior
of DZ17G at room temperature is studied at different testing conditions of loading
direction and loading frequency.The results indicate that the fatigue crack growth
rate(FCGR) is the largest on the specimen with loading angle 90°,smaller on that with
loading angle 0°,and the smallest on that with loading angle 45° due to crack deflection
effect.The influence of loading frequency upon FCGR is related to the range of stress
intensity factor ΔK.The dimension of precipitate γ′ has influence upon the dislocation
arrangement.Microcracks propagate along the γ channel. 相似文献
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