Views: 0 Author: Site Editor Publish Time: 2025-02-12 Origin: Site
(9) Samples of 2A12 and 2024 ingots with uniform firing should be taken at the high temperature end for microstructure inspection, with no less than one sample per furnace. Take the sample at a distance of 15-20mm from the surface of the ingot.
(10) In industrial production, it is best to use a resistance furnace with a forced hot air circulation system for uniform annealing of cast keys, and a sensitive temperature control system should be installed to ensure uniform furnace temperature.
(11) In order to effectively utilize electric furnaces, it is required to classify and load uniformly annealed ingots into furnaces according to the type of alloy, external dimensions, and homogenization annealing temperature. When the furnace temperature is above 150 ℃, it can be directly loaded into the furnace, otherwise the furnace should be preheated according to the electric furnace preheating system. When loading the furnace, there should be a gap between the ingot and the furnace to ensure smooth hot air flow.
(12) The cooling rate of homogenized ingots is generally not strictly controlled. In actual production, they can be cooled in the furnace or stacked together in the air after being discharged. But when the cooling is too slow, the particles that precipitate from the solid solution will grow very coarse.
(13) During homogenization annealing, the heating furnace is first set to the homogenization temperature. After the ingot is loaded into the furnace, the insulation time is calculated only after the surface temperature of the ingot has risen to the homogenization temperature. Generally, the upper limit of time is used for large ingots, and the lower limit of time is used for small ingots; The lower limit of adoption time for high temperature and the upper limit of adoption time for low temperature.
