Hot working method for producing a superplastic ferrous duplex-p

Details Hot working method for producing a superplastic ferrous duplex-p Hot working method for producing a superplastic ferrous duplex-p

1988-01-25

1989-03-14

Yee, Deborah

Metal treatment

Compositions

Heat treating

148 12E, 72709, C21D 800

Patent

active

048121770

ABSTRACT:
A superplastic hot working method for a duplex-phase, nitrogen-containing ferrous alloy and stainless steel, and a superplastic duplex-phase ferrous alloy are disclosed. The ferrous alloy comprises: at least one of Si and Mn in an amount of not less than 0.5 % and not less than 1.7%, respectively; and N: at least 0.01% in solid solution, wherein Si eq and Mn eq which are defined as: Si eq=Si+(2/3) (Cr+Mo), and Mn eq=Mn+2Ni+60C+50N, satisfy the formula:

REFERENCES:
patent: 4722755 (1988-02-01), Maehara

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