Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 425, Issue 1-2, Pages 272-277Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2006.03.095
Keywords
stress corrosion cracking (SCC); stress intensity factor (KI); threshold stress intensity factor (K-ISCC); crack growth rate; SCC testing rig; circumferential notched tensile (CNT) specimen
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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 degrees C. Crack growth rate of SG cast iron in 5 M NaOH solution at 100 and 120 degrees 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. (c) 2006 Elsevier B.V. All rights reserved.
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