Abstract
The influence of grain size and cold working on the threshold of fatigue crack growth was studied in ARMCO iron (grain size, 3–3000 μm; degree of cold working, 0–90%). The role of crack tip shielding due to crack closure mechanisms and crack deflection was examined. The fracture surface roughness is influenced by the grain size and especially by the degree of cold working. However, the effective threshold ΔK eff th for all the microstructures is about 2.75 MPa m 1 2 . The increase in ΔK th with increasing grain size at R = 0.1 is attributed to the increase in crack tip shielding due to crack closure.
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