The Use of Inconel Alloy 706 as a Structural Material in the 300 MVA Superconducting Generator
Westinghouse Electric Corporation and the Electric Power Research Institute are jointly funding the design, development, manufacture, factory test and installation of a 300 MVA, 3600 rpm superconducting generator. Inconel alloy grade 706 is used for many of the cryogenic rotor components, because of its strength and fracture toughness properties at room temperature and 4.2K along with its low thermal conductivity. The Inconel 706 ingots used for the field winding cylinder, end region support blocks and torque tubes are the largest ever made and the extrusions are the heaviest and longest ever made for this alloy. Because of the sizes involved, there were serious concerns over the structure, grain size and uniformity of the large pieces.
KeywordsFracture Toughness Fatigue Crack Growth Crack Size Electric Power Research Institute Rough Machine
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