STRUCTURE AND PROPERTY COMPARISON OF ALLVAC ® 718PLUS ™ ALLOY AND WASPALOY FORGINGS

Abstract

Alloy 718 has seen extensive use for many years due to its excellent mechanical properties, good processing characteristics, and relatively low cost. Numerous attempts have been made to develop a 718-type alloy with temperature capabilities higher than alloy 718. One of the most promising alloys to emerge from these efforts is Allvactextregistered 718Plustexttrademark Alloy. Interest in alloy 718Plus has grown after initial testing showed a 55ºC temperature capability improvement over alloy 718, mechanical properties comparable to waspaloy, and processing behavior similar to alloy 718. A comparison between the structure and properties of alloy 718Plus and waspaloy was performed on pancake forgings produced using an open-die process. The forgings were subjected to grain flow evaluations and subsequently heat-treated. The tensile, creep, and stress rupture properties of the pancake forgings were determined and related to their respective structures.

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