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Stress Corrosion Cracking of High Strength Steels
NAVAL AIR WARFARE CENTER AIRCRAFT DIV PATUXENT RIVER MD
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The stress corrosion cracking SCC was investigated for AerMet 100 and 300M steels in four aqueous NaCl solutions of different concentrations 0.035-3.5, three of which had an identical electrical conductivity 12.44 x 10exp -4 sq m Smol. Especially, the variation of threshold stress intensity for SCC, KISCC, with cathodic potential was evaluated, employing rising step load test method. The KISCC increased, peaked at around the potential of -0.7 VSCE, and then decreased with increasing potential for AerMet 100 steel. On the other hand, the KISCC did not change much with potential for 300M steel. The open circuit potential and the corresponding KISCC were greater for AerMet 100 steel than for 300M steel, indicating the former nobler and more SCC resistant. The SEM fractographs showed mixed cleavage and intergranular cracking, more cleavage for AerMet 100 steel but more intergranular for 300M steel, at all potentials employed.
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