Development of Fe-13% Ni-1.5% Mo alloy for ferromagnetic field winding support shaft of superconducting generator.

Autor: Mori, Takanobu, Sato, Hiroyuki, Takahashi, Ryukichi
Předmět:
Zdroj: Electrical Engineering in Japan; Feb2006, Vol. 154 Issue 3, p1-8, 8p, 4 Black and White Photographs, 2 Diagrams, 5 Charts, 12 Graphs
Abstrakt: Fe-13% Ni-1.5% Mo alloy is investigated in order to develop a ferromagnetic field winding support shaft for a superconducting generator. Solidification test and solidification simulation show that reducing the Mo content of the alloy to 1.5% and selecting 1050-mm-diameter electroslag remelting process is necessary to avoid harmful macro segregation in the ingot. A trial forging of Fe-13% Ni-1.5% Mo alloy having identical cross section of ferromagnetic field winding support shaft of a 200-MW machine is manufactured from 1050-mm-diameter ingot. A series of tests proves that it has no harmful macro segregation and has appropriate properties, that is, stable fracture toughness down to 4 K, ferromagnetism with high flux density, good machinability and weldability. An example of electrical design of a 200-MW machine shows that the ferromagnetic field winding support shaft can improve output density, efficiency, and stability of electrical power system compared to conventional nonmagnetic one. © 2005 Wiley Periodicals, Inc. Electr Eng Jpn, 154(3): 1–8, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/eej.20281 [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
Externí odkaz: