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).
Mechanical test results for T50 alloy forgings and casts, comparing them to 'Y' alloy and Duralumin.
| Identifier | ExFiles\Box 66\1\ scan0164 | |
| Date | 2nd February 1928 | |
| X8090 R.{Sir Henry Royce} By.Rg.{Mr Rowledge} H16/EA3.2.28. Laboratory. ---------------- ------------------- ----------------- Hs.{Lord Ernest Hives - Chair} Wor.{Arthur Wormald - General Works Manager} ------------- Re T50 Alloy. -------------- In connection with the forgings, for pistons, made in the above alloy, we give below some mechanical test results. The material has been moderately forged and heat-treated. It is expected that better results will be obtained on larger casts under production conditions. The outstanding feature of these results is the high Yield Point, which is considerably above that of Duralumin or "Y" alloy. Test Bar No. Max.Str. Y.P. E%. R.A. Brinell. ------------ -------- ------ ---- ----- -------- G11 26.0 21.8 11.0 18.7 125 G13 27.3 22.2 5.5 8.5 125 G15 26.2 22.0 11.0 21.0 125 G16 26.4 21.6 13.5 23.8 125 G17 26.4 22.2 9.5 17.3 121 G18 26.1 21.8 6.5 9.7 121 G1 18.9 -- 1.0 0.7 121 G2 19.6 -- Broken on radius 125 G4 19.6 -- 1.0 Negligible. 125 G5 17.8 -- 0.5 0.4 125 These last four results, namely, G1, G2, G4, G5, are on chill cast, un-forged, bars. The sand cast tensile strength at 300°C. is 9.9 tons per sq.in. as compared with an average figure of 8.5 tons for "Y" alloy, cast and treated in a similar manner. We are doing a hot tensile test, on the forged T50 alloy, which will be reported later. H1. HE | ||