K(SUB IC) OF A 300-GRADE 18-NICKEL MARAGING STEEL AS INFLUENCED BY SPECIMEN TYPE AND THERMAL AND MECHANICAL TREATMENT.
Final technical rept. no. 3,
AUBURN RESEARCH FOUNDATION ALA
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Three different type specimens were employed to determine the critical stress intensity parameter under conditions of constant specimen thickness and varying yield strength. The magnitude of the parameter was observed to vary consistently, with one exception, with specimen type. The parameter also was observed to be a discontinuous function of yield strength from the heat-treated, only, to the heat-treated-plus-coldworked condition. The reason for the rather sharp drop in critical strength intensity for center-cracked relative to surface-cracked specimens could not be explained. Critical strength intensity of surface-cracked specimens was essentially independent of yield strength in the 297 to 335 ksi range. Author