From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
The mechanical properties and heat-treatment process for Beryllium Bronze.
| Identifier | ExFiles\Box 149\4\ scan0343 | |
| Date | 31th May 1937 guessed | |
| - 5 - are as shewn in the table below:- BERYLLIUM BRONZE, FULLY HEAT-TREATED. | Be.Content. per cent. | Size & Form of piece. | Maximum Stress. Tons/Sq.Inch. | Elongation. per cent. | V.P.N. | |---|---|---|---|---| | 2.5 | 0.028" Strip | 88.4 | 3.0 | 404 | | 2.57 | 0.008" " | 88.9 | 1.5 | - | | 2.35 | 0.036" dia.Wire. | 106.7 | 2.5 | 410 | | 2.23 | 0.064" " " | 90.2 | 1.5 | - | | 2.35 | 0.125" " " | 80.34 | 3.0 | 392 | | 2.35 | 1" dia.Extruded Bar. | 86.64 | 3.5 | 356 | HEAT-TREATMENT. The remarkable mechanical properties of beryllium bronze are the result of a simple heat-treatment and do not depend upon the application of cold work. Thus, the hardness is absolutely stable up to a fairly high temperature and does not postulate any liability to season cracking or fire cracking, which are very common troubles associated with the usual run of non-ferrous materials, particularly when these materials carry the label "High Tensile". The heat-treatment of beryllium-bronze is a perfectly simple and straightforward process, which provides, between stages of heat-treatment, a condition when the material is as highly ductile as 70/30 brass. In this stage, all bending, forming, shaping and deep-drawing operations can be conducted with the greatest ease, and it is important to remember that in ninety-nine cases out of one hundred there is no necessity to attempt to deform beryllium bronze when it is in the condition of maximum hardness. The first stage in the heat-treatment of beryllium bronze is the solutionising process. The parts are heated to 800°C [crossed out: 820°c], for such time as will ensure their being thoroughly soaked, when they are quenched as rapidly as possible from this temperature in water. The process has the effect | ||