Modern turbine engine performance and life cycle requirements demand single crystal superalloy turbine airfoil and seal components. Complex SX vane segments can result in severe manufacturing cost challenges. This has resulted in the development of an improved creep-rapture strength SX superalloy designated CMSX®-486. This alloy is grain boundary strengthened through optimised additions of boron, carbon, hafnium and zirconium and is designed for use as-cast, to maximise complex casting yield through the use of generous grain specifications and without solution heat treatment recrystallisation problems. The paper in particular gives comprehensive low and high angle boundary creep-rupture properties of CMSX-486, enabling grain specifications to be developed depending upon component design requirements. The alloy has now entered its turbine application development phase.

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