Abstract
It has been a serious problem whether the microstructure dependence of crack growth arises due to the change in crack closure level or intrinsic crack growth resistance. In order to investigate the effect of microstructure on fatigue crack growth behaviors at the threshold region, three kinds of ferrite base materials were fatigued at room temperature and slightly elevated temperatures. The fatigue results on the low carbon steel can be explained well by the ΔKeff conception, that is, the crack growth resistance is not affected by the structural factors, such as cyclic strain aging and precipitation hardening by low temperature quench aging. On the other hand, the results on spheroidal graphite cast iron cannot be explained only by ΔKeff conception. It may be considered that the graphite particles act as promoters at higher ΔK level and as obstacles at lower ΔK level to crack growth.
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