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 results of a reheat treatment, noting changes in fracture, hardness, and microstructure.
| Identifier | ExFiles\Box 121\1\ scan0042 | |
| Date | 12th September 1938 guessed | |
| (2). 900°C. quenched in water. 760°C. quenched in water. The fracture after reheat treatment was very much improved; and the hardness was 3000/10 197. The micro structure was slightly improved but still contained free ferrite. H1/E.JW. | ||