Metal treatment – Compositions – Heat treating
Patent
1975-11-20
1977-10-25
Stallard, W.
Metal treatment
Compositions
Heat treating
C22F 108
Patent
active
040554457
ABSTRACT:
An improved ternary brass alloy includes silicon as the additive material and may be fabricated to provide a beta brass or a mixed alpha plus beta brass material. The composition limits of the constituents of the beta brass are fixed by two factors: (1) the M.sub.s or Martensite transformation temperature must be determined, and (2) the brass must be a totally beta phase above 454.degree. C. The composition is betatized, that is, heated at approximately 800.degree. C. and quenched at a fast rate so that the total beta phase is retained in order to provide material having a shape memory effect, a low spring back coefficient and super elastic properties. A continuous betatizing and quenching process may be utilized in the manufacture of strip and sheet products. Alternatively, specific compositions may be cold worked to provide a material having a low spring back coefficient and other improved physical characteristics. The alpha plus beta brass includes 25% to 75% by weight beta phase mixed with alpha phase. The gamma phase is not tolerated. Generally, the same composition limits as the beta brass material are observed through processing and characteristics of the mixed alpha plus beta are distinct. Methods for manufacture of the mixed alpha plus beta phase are disclosed.
REFERENCES:
patent: 3783037 (1974-01-01), Brook et al.
Essex International, Inc.
Stallard W.
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