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).
Heat treatment procedures and impact testing for frames to improve uniformity and prevent breakage.
| Identifier | ExFiles\Box 75\3\ scan0268 | |
| Date | 24th September 1913 | |
| TYPE 9 R.R.Co.Ltd.(X) 100M.9.12. 4962 COPY. COPY R9/P 24.9.13. Na{Mr Nadin}6/B10913. X703 To Na{Mr Nadin} from R.{Sir Henry Royce} Copy for Wor{Arthur Wormald - General Works Manager}, Withreference to frames, although there does not seem a very great variation between the broken piece and the piece we have heat treated, according to the test piece I much prefer that we do heat treat the frames to get them more uniform, and it also appears that we should take great care that the second heat should be about 450° as 400° seems slightly brittle, but it ought not to be above 500°, which is evidently making it too soft. We ought to find some impact test for these parts, which might tell rather a different tale to the static testing. The test, J.17, as delivered by the makers, appears to be very poor in the particular instance given, and would tend to show that [strikethrough]that[/strikethrough] there is considerable variation in the frames as the makers deliver them, but at the same time this does not account at all for the breakage. I am not supposing it does, but we might as well have the frames in the best condition they can be got. I should like some pieces tested treated as suggested, a few days ago, that is simply heated to 800°, and cooled in the air and not soaked. R.{Sir Henry Royce} | ||