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 a sample of steel detailing its chemical analysis and remarks on brittleness.
| Identifier | ExFiles\Box 76\3\ scan0068 | |
| Date | 25th July 1918 | |
| RR. 864. ROLLS-ROYCE, LIMITED. LL 187 LABORATORY REPORT ON SAMPLE OF STEEL. To: for Service & Mr Pendlebury Date: 25 . 7 . 1918 Re: Contact Roller race which was brittle steel in the form of: a/c marked: - received at works on: received by: laboratory on: 24 . 7 . 18 CHEMICAL ANALYSIS. Carbon: 1.43 % Nickel: % Chromium: 1.20 % Vanadium: % Tungsten: % Manganese: .60 % Silicon: % Sulphur: % Phosphorus: % Remarks, etc. The brittleness of the race is due to the high carbon & manganese. A close examination revealed the presence of small hair cracks which showed up much better on tapping with a hammer. Micro-examination indicates considerable free cementite in a semicellular arrangement. Signature: H.C.P. | ||