Metal treatment – Compositions – Heat treating
Patent
1977-02-18
1978-08-15
Stallard, W.
Metal treatment
Compositions
Heat treating
148 127A, C22F 104
Patent
active
041069560
ABSTRACT:
A process is disclosed for facilitating extrusion or rolling of a solidified dendritic aluminum base alloy billit, or the like, by heating the billet to provide an inner liquid phase of below 25%, by weight, wherein the dendritic phase has started to develop into a primary solid globular phase without disturbing the solidified character of the billet, followed by working of the treated billet. The process enables a reduction in working pressure and results in improved mechanical properties of the product. Optionally, in the case of precipitation hardening aluminum base alloys, quenching of the workpiece is effected as it exits from the die or mill, followed by artificial or natural aging. In another embodiment, the composition of the alloy of the billet being treated contains an amount of hardening constituent whereby the composition of the globular solid phase of the product approximates the composition of the alloy per se.
REFERENCES:
patent: 2249353 (1941-07-01), Fritzlen
patent: 2671559 (1954-03-01), Rosenkranz
patent: 3948650 (1976-04-01), Flemings et al.
patent: 3988180 (1976-10-01), Bouvaist
Societe de Vente de l'Aluminium Pechiney
Stallard W.
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