Fracture toughness (KIc) and aqueous stress corrosion tests in 3·5% NaCl and distilled water have been carried out on specimens taken from a thick forged rectangular bar of IMI 551. Fracture toughness varied from 29–36 MN/m3/2 while the KIscc values in salt water and distilled water were 13·5–16·5 MN/m3/2 and 19 MN/m3/2, respectively. The results of all the tests, together with data from other sources, are used to discuss application of the alloy in aircraft components.
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