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).
Metallurgical analysis of a forging, detailing a crack and ferrite branches caused by decarburisation and folds.
| Identifier | ExFiles\Box 152\1\ scan0213 | |
| Date | 9th December 1936 guessed | |
| -2- The crack shown in photomicrograph No.A1543 was noted in the curved part of the arm near the small end. It is situated in the mass of ferrite shown (white) in photomicrograph No. A1544 (depth of flaw 0.040"). Several other branches of ferrite were noted in our specimens. They are due to decarburisation and folds in the surface of the forging. We call your attention to their presence as they would give trouble if subjected to fatigue stresses. Hl. IHE Photomicrographs Nos. A1541 - 4 att. Section of Lever and Shaft showing method of fixing returned to Rm {William Robotham - Chief Engineer} /Les. | ||