Metal treatment – Process of modifying or maintaining internal physical... – Chemical-heat removing or burning of metal
Patent
1974-12-23
1976-10-26
Dean, R.
Metal treatment
Process of modifying or maintaining internal physical...
Chemical-heat removing or burning of metal
148 127A, 148 325, C22F 104
Patent
active
039881806
ABSTRACT:
The invention relates to a method of heat treatment which is applied to forged aluminum alloys, whereby the mechanical characteristics and resistance against corrosion under tension are increased considerably. This method is characterized by heating prior to tempering, above the temperature of eutectic melting, while remaining below the temperature of the start of the melting at equilibrium. The liquid phase formed temporarily is resorbed progressively, while the formation of pores is avoided by a sufficiently low hydrogen content of the metal. The application of this procedure to several aluminum alloys made it possible to observe increases of the limit of elasticity and of the break load of the order of 7% and a non-rupture stress under tension in 30 days at least equal to 30 hb.
REFERENCES:
patent: 3791876 (1974-02-01), Kroger
patent: 3791880 (1974-02-01), Hunsicker et al.
patent: 3826688 (1974-07-01), Levy
Dean R.
Societe de Vente de l'Aluminium Pechiney
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