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The heat treatment of beryllium bronze
From;  Author:Stand originally
Beryllium bronze is the precipitation sclerosis with a kind of extremely extensive use alloy. After classics solid dissolve and ageing treatment, intensity can amount to 1250-1500MPa(1250-1500 kilogram) . Characteristic of its heat treatment is: Good plasticity is had after solution treatment, can undertake cold working is out of shape. But after having ageing treatment again, have wonderful stretch limit however, at the same time hardness, intensity also gets rising.


(1) the solution treatment of beryllium bronze


Of common solution treatment heat temperature is between 780-820 ℃ , the material of stretch to using as component, use 760-780 ℃ , basically be to prevent grain bulky influence intensity. Uniformity of solution treatment furnace temperature should be controlled strictly in ± 5 ℃ . Heat preservation time can press 1 hour commonly / 25mm computation, beryllium bronze undertakes in air or oxidisability atmosphere dissolve adds heat treatment originallying when, the surface can form oxidation film. Although be opposite,the mechanical function after aggrandizement of effectiveness for a given period of time is affected not quite, but the service life that can affect pattern of the industry when its cold working. Should decompose in vacuum furnace or ammonia to prevent combustion, inert gase, reducing atmosphere (wait like hydric, carbon monoxide) in heat, achieve shining heat treatment result thereby. In addition, notice to shorten as far as possible even move time (when this hardening) , can affect the mechanical performance after effectiveness for a given period of time otherwise. Light body material must not exceed 3 seconds, general spare parts does not exceed 5 seconds. Quench medium uses water commonly (ask without what heat) , of course the part with complex form also can use oil to avoid to be out of shape.


(2) the ageing treatment of beryllium bronze


The content of the temperature of effectiveness for a given period of time of beryllium bronze and Be is concerned, contain Be to be less than the alloy of 2.1% all appropriate has ageing treatment. Be more than the alloy of 1.7% to Be, temperature of optimal effectiveness for a given period of time is 300-330 ℃ , hour of 1-3 of heat preservation time (reach ply according to spare parts appearance) . Be under the alloy of tall conductivity electrode of 0.5% , because dissolve dot is elevatory, temperature of optimal effectiveness for a given period of time is 450-480 ℃ , hour of 1-3 of heat preservation time. Returned development to give dual class and multistage effectiveness for a given period of time in recent years, namely the effectiveness for a given period of time when preexistence high temperature is short, fall in microtherm after that long heat preservation effectiveness for a given period of time, the good point that such doing is function rises but deflection is reduced. To raise the dimension precision after beryllium bronze effectiveness for a given period of time, can use clamping apparatus clip to hold have effectiveness for a given period of time, still can use two paragraphs of separate ageing treatment sometimes.
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