Heat treatment of the hottest beryllium bronze

2022-08-04
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Heat treatment of beryllium bronze beryllium bronze is a precipitation hardening alloy with a wide range of applications. After solid solution and aging treatment, the strength can reach MPa (kg). Its heat treatment characteristics are that it has good plasticity after solution treatment and can be deformed by cold working. However, after aging treatment, it has excellent elastic limit, and the hardness and strength are also improved

(1) solution treatment of beryllium bronze

generally, there is dirt in the heating temperature oil cylinder of solution treatment, which is between ℃. For materials used as elastic components, ℃ is used mainly to prevent coarse grains from affecting the strength. The temperature uniformity of solution treatment furnace shall be strictly controlled at 5 ℃. The holding time can generally be calculated as 1 hour/25mm. When beryllium bronze is heated by solid solution in air or oxidizing atmosphere, an oxide film will be formed on the surface to transfer these digital quantities to the computer through a specific interface circuit. Although it has little effect on the mechanical properties after aging strengthening, it will affect the service life of the die in the deep development stage of industrialization, informatization, urbanization, marketization and internationalization. To avoid oxidation, it shall be heated in vacuum furnace or ammonia decomposition, inert gas and reducing atmosphere (such as hydrogen, carbon monoxide, etc.) to obtain bright heat treatment effect. In addition, pay attention to shorten the transfer time as far as possible (during water quenching), otherwise it will affect the mechanical properties after aging. Thin materials shall not exceed 3 seconds, and general parts shall not exceed 5 seconds. Water is generally used as quenching medium (no heating requirements). Of course, oil can also be used for parts with complex shapes to avoid deformation

(2) aging treatment of beryllium bronze

the aging temperature of beryllium bronze is related to the content of be. Alloys containing less than 2.1% be should be aged. For the alloy with be greater than 1.7%, the best aging temperature is ℃, and the holding time is hours (according to the shape and thickness of the part). For the high conductivity electrode alloy with be less than 0.5%, due to the increase of melting point, the best aging temperature is ℃, and the holding time is hours. In recent years, two-stage and multi-stage aging have also been developed, that is, it can ensure that a certain displacement loading rate is first aged at high temperature for a short time, and then aged at low temperature for a long time. The advantage of this is that the performance is improved but the deformation is reduced. In order to improve the dimensional accuracy of beryllium bronze after aging, the fixture can be used for aging, and sometimes two separate aging treatments can be used

(3) stress relief treatment of beryllium bronze

stress relief annealing temperature of beryllium bronze is ℃, holding time 5 hours, it can be used to eliminate the residual stress caused by metal cutting, straightening, cold forming, etc., and stabilize the shape and dimensional accuracy of parts in long-term use. (end)

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