Metal treatment – Compositions – Heat treating
Patent
1985-11-29
1988-02-02
Dean, R.
Metal treatment
Compositions
Heat treating
148 12EA, 148325, 148327, 420902, C21D 714
Patent
active
047227559
ABSTRACT:
A duplex .alpha. (ferrite) and .gamma. (austenite) phase stainless steel exhibiting superplasticity at high strain rate is disclosed. The steel comprises Fe, Cr, and Ni as primary elements, and N in an amount of 0.05-0.25%, preferably 0.1-0.2% by weight. The amount of Cr+Mo+1.5xSi is preferred to be substantially three times as much as that of Ni+0.5.times.Mn+30.times.C+25.times.N. The disclosed steel shows good superplasticity in the temperature range of from 700.degree. C. to the point 100.degree. C. lower than the temperature at which the steel transforms into a single ferrite phase and at a strain rate of at least 1.times.10.sup.-6 s.sup.-1 and less than 1.times.10.sup.0 s.sup.-1, and can be elongated by more than 1000% at 900.degree. C. and at a strain rate of 1.5.times.10.sup.-2 s.sup.-1.
REFERENCES:
patent: 4390367 (1983-06-01), Niehaus et al.
Dean R.
Sumitomo Metal Industries Ltd.
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