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 from a broken Vickers Crankshaft after a 50 hour run.
| Identifier | ExFiles\Box 76\3\ scan0073 | |
| Date | 19th August 1918 | |
| RR. 864. ROLLS-ROYCE, LIMITED. LL 194 LABORATORY REPORT ON SAMPLE OF STEEL. To EH EP{G. Eric Platford - Chief Quality Engineer} + BY Date 19/8/18 191 Re Vickers Crankshaft, broken after running steel 50 hours. in the form of broken pieces (drilled) marked. received at works on received by laboratory on 16/8/18 CHEMICAL ANALYSIS. Carbon .41 % Nickel 3.48 % Chromium .62 % Vanadium % Tungsten % Manganese .45 % Silicon .21 % Sulphur .032 % Phosphorus .037 % Remarks, etc. The analysis is practically normal. Carbon on high side of specification, manganese rather less. Microscopically, the steel in the vicinity of cracks, was found to be segregated - manganese sulphide + phosphide eutectic being evident. Incorrect heat treatment was also indicated, since the steel was more troostitic than usual. (Though this is less evident away from segregated areas). Signature HCF | ||