Heat treatment for aluminum casting alloys to produce high stren

Details Heat treatment for aluminum casting alloys to produce high stren Heat treatment for aluminum casting alloys to produce high stren

1999-06-28

2000-06-13

Wyszomierski, George

Metal treatment

Process of modifying or maintaining internal physical...

Heating or cooling of solid metal

148702, C22C 2100, C22C 2102, C21D 100

Patent

active

060745010

ABSTRACT:
An aluminum casting of composition that is hardenable due to the presence of suitable amounts of silicon, magnesium and, optionally, other hardening constituents such as copper, nickel and the like is heat treated for improved tensile strength at 300.degree. C. The casting, which as formed has a microstructure of aluminum rich dendrites, silicon particles and hardening particles, is reheated above 500.degree. C. to redissolve the hardening particles and redistribute hardening constituents through the aluminum dendrites, cooling the casting to 350.degree. C. to 450.degree. C. and holding there to reform an abundance of large stable hardening precipitates in the aluminum dendrites and then air cooling the casting. The thus treated casting may then be artificially age hardened such as by a T5 temper practice.

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