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Alloy 71 8 is typically used as a fastener material where high strength, corrosion resistance, and elevated temperature service are critical requirements. At elevated temperatures, the precipitation of alpha Cr phase in grain boundaries of alloy 7 18 can markedly decrease its impact properties. Increased amounts of residual strain in the material dramatically increase alpha Cr precipitation and growth. 15 17Mpa (220 ksi) bolts, which are made from 20% cold worked bar, were found to have more alpha Cr than 1241Mpa (180 ksi) bolts both before and after high temperature exposure. Experiments on the 20% cold worked bar revealed that the alpha Cr precipitated during the 71 8°C part of the direct aging cycle and that a solution treatment of 982°C did not decrease the precipitation. When alloy 718 bolts were exposed at 538OC for 500 hours, severe alpha Cr precipitation occurred adjacent to the cold rolled bolt threads, where alpha Cr was found in a fine network of either grain or subgrain boundaries. Superullo? s 7 18. 625. 706 and Various D e r i ~ a t i v e s Edited b! E.A. Loria ? 'XIS (The \linerals. Metals R: Materials Society). 2001

Effect of Residual Strain on Alpha CR Precipitation in Alloy 718 Fasteners