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).
Laboratory report on the material examination of Lake and Elliott Cast Iron Brake Drums.
| Identifier | ExFiles\Box 120\1\ scan0075 | |
| Date | 1st March 1932 | |
| To Hy.{Tom Haldenby - Plant Engineer} (struck through) c. Hs.{Lord Ernest Hives - Chair} (struck through) X4617. HL.1/El. 3. 32. Laboratory. Report No. L2346. RE - BRAKE DRUMS We have examined the material of the Lake and Elliott Cast Iron Brake Drums. The results are:- Combined Carbon - 0.47 % Manganese - 0.95 % Titanium - Nil. Vanadium - Nil. Silicon - 1.79 % Sulphur - 0.05 % Phosphorus - 0.03 % Molybdenum - Nil. Nickel - 1.28 % Chromium - 0.05 % Brinell Hardness - 256. In many respects this resembles our cast iron. The titanium and phosphorus are considerably lower, and there is a very small amount of chromium. We do not think that the presence of the small amount of titanium usually present in our cast iron should make any appreciable difference. It is improbable that the small amount of chromium has any bearing on the quality of the brake drum. We notice that a little chilling has taken place on the fins. This effect will have been reduced considerably by the presence of the nickel. Microscopical Examination shows that the graphite is small and compact. See accompanying photomicrograph A759. Photomicrograph A760 shows that there are comparatively large areas of sorbite, and the pearlite is refined. It is also evident that the phosphide eutectic is only present in small quantities, confirming the analysis. HL. HE | ||