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 metallurgical properties of experimental T50 alloy pistons compared to 'Y' alloy, with a note on 'Condor' valve failure.
| Identifier | ExFiles\Box 66\1\ scan0166 | |
| Date | 2nd February 1928 | |
| X8040 R.{Sir Henry Royce} BY.{R.W. Bailey - Chief Engineer} Hs.{Lord Ernest Hives - Chair} c to BJ. c to Wor.{Arthur Wormald - General Works Manager} H13/EAll.2.28. Laboratory. Re Yours R2/M6.2.28. A set of experimental car pistons has now been cast in the light, high yield point, T50 alloy. A comparison between the average test results obtained on test bars submitted with "Y" alloy pistons and T50 die-cast, is made below :- Maximum Stress. Yield Point. Brinell. "Y" alloy (forged) 18.8 tons 15.7 tons 108 T50 (chill cast) 19.4 " 16.5 " 125 T50 (forged) 26.7 " 22.5 " 133 We have done several Izod and Stanton tests on these alloys, but more will be done in a few days, together with Upton-Lewis tests and Hot mechanical tests, results of which will be given as soon as possible. It is a question whether a forged material is as-good from the texture point of view, as the fine grained, rather more granular structure of a T50 die-casting (Cast Iron is a good material for pistons in spite of its granular structure and absence of ductility). With respect to the "Condor" valve failure, we enclose photos. and copies of reports relating to this. It is anticipated that suggested modifications of testing procedure should make repetition of such trouble practically impossible. H1. HC Copies of photos. and reports att: to R.{Sir Henry Royce} only. | ||