Beryllium bronze is a very wide use of precipitation hardening alloys. The solid solution and aging treatment, the intensity of up to 1250-1500MPa (1250-1500 kg). The heat treatment is characterized by: has good plasticity, cold deformation after solution treatment. But re-aging treatment, with excellent elastic limit at the same time the hardness, strength also improved.
(1) of the solution treatment of the beryllium bronze
The general solution treatment of heating temperature is between 780-820 ℃, the material used as the elastic component, using the 760-780 ° C, is to prevent the intensity of grain coarsening effects. The solution heat treatment furnace temperature uniformity should be strictly controlled at ± 5 ° C. The holding time may be generally 1 hour / 25mm calculation, beryllium bronze solid solution heat treatment in air or oxidizing atmosphere, the oxide film formed on the surface. On aging enhanced mechanical properties of small, but its cold will affect the service life of the tool and mold. In order to avoid oxidation in a vacuum furnace or ammonia decomposition, inert gas, the reducing atmosphere (such as hydrogen, carbon monoxide, etc.), heating, bright heat treatment effects. Also, pay attention to try to shorten the transfer time (hardening), otherwise it will affect the mechanical properties after aging. The thin material shall not be more than 3 seconds, the general parts of not more than five seconds. Quenching medium is commonly used water (heating), and of course the shape of complex parts can be applied in order to avoid distortion of oil.
(2) aging of beryllium bronze processing
Beryllium bronze aging temperature and Be content, less than 2.1% of the alloy containing Be are advised to the aging treatment. Be greater than 1.7% of the alloy, the optimum aging temperature is 300-330 ° C, holding time of 1-3 hours (depending on part shape and thickness). Be less than 0.5% of the high conductivity of the electrode alloy, the melting point increases, the optimal aging temperature is 450-480 ° C, holding time of 1-3 hours. In recent years has also developed a two-stage and multi-step aging, that is, first in the high temperature short time limitation, then the insulation aging at low temperatures for a long time, the advantages of doing so is performance improvement, but the deformation decreases. Order to improve the dimensional accuracy in the beryllium bronze after aging can be used fixture clamping aging, and sometimes also two separate aging treatment.
(3) beryllium bronze to stress treatment
Beryllium bronze went to stress the annealing temperature is 150-200 ° C, holding time of 1-1.5 hours, and can be used to eliminate due to metal cutting, straightening treatment, the residual stress of cold forming, the shape and dimensional accuracy of the stability of parts in the long-term use .
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