![]() These aging heat treatments resulted in the reduction of the primary creep strain produced in PWA 1484 from 24% to 16% at 704Â☌/862 MPa and produced a slight dependence of the tensile properties of PWA 1480 on aging heat treatment temperature. All three alloys exhibited the presence of secondary gamma' confirmed by scanning electron microscopy and local electrode atom probe techniques. The age heat treatments used for creep testing were either 704Â☌/24 hr. To aid in the understanding of rhenium's role in primary creep, 3wt% Re was added to PWA 1480 to create a second generation version of PWA 1480. This investigation examines how the addition of rhenium and changes in aging heat treatment affect the primary creep behavior of PWA 1480 and PWA 1484. Primary creep occurring at intermediate temperatures (650Â☌ to 850Â☌) and loads greater than 500 MPa has been shown to result in severe creep strain, often exceeding 5-10%, during the first few hours of creep testing. The primary creep behavior of single crystal, nickel base superalloys PWA 1480 and PWA 1484 ![]()
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