Boron stainless steel powder and rapid solidification method

Details Boron stainless steel powder and rapid solidification method Boron stainless steel powder and rapid solidification method

1980-05-27

1984-02-07

Lewis, Michael L.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 05BA, 75251, B22F 100, B22F 104

Patent

active

044301154

ABSTRACT:
Alloys having composition similar to commercial precipitation-hardenable stainless steels, but modified by the addition of 1.4 to 2.4 wt % boron, are disclosed. The alloys are subjected to a rapid solidification processing (RSP) technique which produces cooling rates between .about.10.sup.5 -10.sup.7 .degree.C./sec. The as-quenched RSP ribbon or powder, etc., consists primarily of a metastable crystalline solid solution phase. The metastable crystalline phases are subjected to suitable heat treatments so as to produce a transformation to a stable multiphase microstructure, which includes borides; this heat treated alloy exhibits superior mechanical properties and thermal stability in conjunction with good corrosion and oxidation resistance.

REFERENCES:
patent: 3352666 (1967-11-01), Foster et al.
patent: 3598567 (1971-08-01), Grant
patent: 3970445 (1976-07-01), Gale et al.
patent: 4014680 (1977-03-01), Reen
patent: 4066422 (1978-01-01), Moen
patent: 4240824 (1980-12-01), Moskowitz
patent: 4304593 (1981-12-01), Maeland
Ruhl, R. C., et al., "Splat Quenching of Fe-B Alloys", Trans. of the Metallurgical Soc. of AIME, vol. 245, pp. 253-257, (2/69).

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