Abstract
Near threshold crack propagation rate was measured for SAE1010, SAE8620, SAE1045 and SAE1080 steels in various conditions. The crack propagation rate was lower and the threshold stress intensity was higher for the steels in the as-received hot rolled condition than for steels in the cold rolled or quenched and tempered conditions. Neither the as-received ferrite-pearlite nor the quenched and tempered martensite showed significant changes in crack propagation rate or threshold stress intensity with carbon content. Tempering temperature had a pronounced effect on tensile strength and ductility; however its effect on threshold stress intensity was small. There is no simple relationship between tensile properties and threshold stress intensity. The threshold stress intensity of an upper bainite was close to that of the as received ferrite-pearlite, while that of a lower bainite was close to that of the quenched and tempered martensite.
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