Abstract
A novel fracture mechanics technique has been employed for the determination of crack growth rate and threshold stress intensity factor ( K Iscc) for stress corrosion cracking (SCC) using small circumferential notch tensile (CNT) specimens. The technique was applied successfully for testing SCC susceptibility of spheroidal graphite (SG) cast iron in 5 M NaOH at 100 and 120 °C. Crack growth rate of SG cast iron in 5 M NaOH solution at 100 and 120 °C has been determined at different stress intensity factors ( K I), and the K Iscc have been determined to be 11.2 and 9 MPa m 1/2, respectively. The surfaces of fractured specimens have been examined by scanning electron microscopy (SEM) in order to establish intergranular propagation of stress corrosion cracks. CNT testing is a simple, relatively fast and cost-advantageous approach for generating crack growth rate and K Iscc data.
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