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Two cast nickel-base superalloys with superior creep rupture lives at high temperatures and high stresses were developed. In the present study, the microstructural characteristics of γ′-precipitates and the hardening behaviour were studied by electron microscopy and micro-hardness testing. The alloys were solution-treated at 1553 K for 2 h and air-cooled followed by step ageing heat treatments. Ageing...
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