Method and apparatus for simplified production of heat-treatable

Details Method and apparatus for simplified production of heat-treatable Method and apparatus for simplified production of heat-treatable

1997-01-30

1999-07-13

Wyszomierski, George

Metal treatment

Process of modifying or maintaining internal physical...

With casting or solidifying from melt

148698, 148699, 148700, C22F 104

Patent

active

059221470

ABSTRACT:
Method and apparatus for simplified heat-treatment to harden aluminum castings made from heat-treatable aluminum alloys, especially with a copper content of up to 5%, such as the 300-T6 series, for example those cast aluminum parts utilized in the manufacture of automobile motors: cylinder heads, engine blocks and the like; whereby the castings are directly quenched before cooling below 400.degree. C. (and preferably immediately after demolding) without undergoing the conventional steps of natural cooling followed by a re-heating "solution" heat treatment (typically of at least 470.degree. C. for at least two hours, or for a shorter time at higher temperatures) which "solution" heat treatment requires excessive and expensive equipment, energy, and production time. This invention also has the unexpected beneficial effect of avoiding development of silicon spheroidization in the alloy matrix thereby resulting in improved machining properties.

REFERENCES:
patent: 1732573 (1929-10-01), Welty
patent: 2062329 (1936-12-01), Nock, Jr.
patent: 4419143 (1983-12-01), Ito et al.
Metals Handbook, 9th Ed., vol. 15 (Casting); ASM International, 1988; Metals Park, Ohio; pp. 757-759.
Metals Handbook, 9th Ed., vol. 4 (Heat Treating); ASM International, 1981; Metals Park, Ohio; pp. 704-706.
Journal of Heat Treating, vol. 8, No. 1, Jan. 1, 1990, pp. 63-70, XP000140706, Shivkumar S et al: "Effect of Solution Treatment Parameters on Tensile Properties of Cast Aluminum Alloys".

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