Conditions for the Formation of "A" Segregation and Precipitating Phases in iron-base superalloy A 286

Sakurai, Takashi; Yamada, Hitohisa; Kitamura, Kazuo; Takenouchi, Tomoo

doi:10.2355/tetsutohagane1955.74.12_2286

Cited by 7 publications

(1 citation statement)

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“…The critical value for the formation of macro segregation can be found by calculating the value of ε × R 1.1 , based on the cooling speed ε (K/min) for the solidification process at the starting point for the formation of macro segregation and the solidification speed R (mm/min) [4]. The macro segregation formation value (ε × R 1.1 ) c is a value unique for each material, and the smaller this value is, the less likely macro segregation is to occur.…”

Section: Effects Of the Amount Of Mo On Macro Segregationmentioning

confidence: 99%

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

2005

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SUMMARYFe-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.

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Section: Effects Of the Amount Of Mo On Macro Segregationmentioning

confidence: 99%