Martensitic stainless steel strengthened by Ni 3 Ti...

Details Martensitic stainless steel strengthened by Ni 3 Ti... Martensitic stainless steel strengthened by Ni 3 Ti...

2011-02-01

2011-02-01

Yee, Deborah (Department: 1793)

Metal treatment

Stock

Ferrous

C148S326000, C148S327000, C148S328000, C148S335000, C420S038000, C420S053000, C420S057000, C420S068000, C420S107000, C420S109000

Reexamination Certificate

active

07879159

ABSTRACT:
A precipitation-hardened stainless maraging steel which exhibits a combination of strength, toughness, and corrosion resistance comprises by weight about: 8 to 15% chromium (Cr), 2 to 15% cobalt (Co), 7 to 14% nickel (Ni), and up to about 0.7% aluminum (Al), less than about 0.4% copper (Cu), 0.5 to 2.6% molybdenum (Mo), 0.4 to less than about 0.75% titanium (Ti), up to about 0.5% tungsten (W), and up to about 120 wppm carbon (C), the balance essentially iron (Fe) and incidental elements and impurities, characterized in that the alloy has predominantly lath martensite microstructure essentially without topologically close packed intermetallic phases and strengthened primarily by a dispersion of intermetallic particles primarily of the eta-Ni3Ti phase and wherein the titanium and carbon (Ti) and (C) levels are controlled such that C can be dissolved during a homogenization step and subsequently precipitated during forging to provide a grain-pinnning dispersion.

REFERENCES:
patent: 3251683 (1966-05-01), Hammond
patent: 4514235 (1985-04-01), Augustin et al.
patent: RE36382 (1999-11-01), Hultin-Stigenberg
patent: 6630103 (2003-10-01), Martin et al.
patent: 63-134648 (1988-06-01), None
Acta Materialia 52 (2004) 1023-1037—Precipitation hardening in a 12% Cr-9%Ni-4%Mo-2%Cu stainless steel by Matshattestrand, et al. , Jan. 8, 2003.

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