Tool steels which contain boron and have been processed using a

Details Tool steels which contain boron and have been processed using a Tool steels which contain boron and have been processed using a

1979-11-19

1982-03-09

Skiff, Peter K.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75123B, 75126P, 75213, 148 36, 428606, C22C 3832

Patent

active

043187331

ABSTRACT:
Alloys having compositions similar to commercial tool steels, but modified by the addition of 0.1 to 1.5 wt. % boron are disclosed. The alloys are subjected to a rapid solidification processing (RSP) technique, producing cooling rates between 10.sup.5 -10.sup.7 .degree.C./sec. The as-quenched RSP ribbon or powder, etc. consists essentially of a single phase with a body centered cubic structure. After selected heat treatments, the rapidly solidified alloys have a microstructure consisting of ultrafine metallic carbides and metallic borides dispersed in an iron rich matrix and thus have high hardness, wear resistance and high-temperature stability. These final structures have improved properties for applications, e.g., where standard high speed tool steels are now utilized.

REFERENCES:
patent: 3977838 (1976-08-01), Hashimoto et al.
patent: 3986867 (1976-10-01), Masumoto et al.
patent: 4067732 (1978-01-01), Ray
patent: 4121930 (1978-10-01), Yukawa et al.
patent: 4133679 (1979-01-01), Ray et al.
patent: 4152144 (1979-05-01), Hasegawa et al.
patent: 4210443 (1980-07-01), Ray
patent: 4221592 (1980-09-01), Ray

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