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Monocrystalline specimens of the Y.-hardened Rhenium-containing superalloy CMSX-4 were tested in tensile creep under constant stress at temperatures of 800°C and 950°C. The shapes of the differentiated creep curves are distinctly different for the two temperatures. All curves exhibit minima of the creep rate and a subsequent increase, in particular at low stresses and high temperatures, due to the formation of the y/y’-raft structure. The latter was found to deteriorate the creep properties under the given test conditions. The creep rupture behaviour can be described in a modified creep rupture diagram, based on the threshold stress concept. According to a Larson-Miller plot, the alloy CMSX-4 offers an improved creep temperature capability, compared to SRR 99, of about 20°C at low stresses and more than 40°C at higher stresses. Superalloys 1992 Edited by S.D. Antolovich, R.W. Stusrud, R.A. MacKay, D.L. Anton, T. Khan, R.D. Kissinger, D.L. Klarstrom The Minerals, Metals & Materials Society, 1992

Creep Deformation and Rupture Behaviour of the Monocrystalline Superalloy CMSX-4: A Comparison with the Alloy SRR 99