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).
Data sheet for 'Hiduminium' R.R. 50, a general sand and die-casting alloy.
Identifier | ExFiles\Box 116\2\ scan0126 | |
Date | 22th December 1939 guessed | |
Data Sheet No. 34 "HIDUMINIUM" R.R. 50 ALLOY (D.T.D.133.B). General Sand and Die-Casting Alloy. It is well known that in large castings embodying drastic changes of sections, quenching treatments from high temperatures are apt to set up internal strains due to differential contraction of the various sections of the material. These may be of a more or less serious nature according to the degree of variation and the severity of the quench. In this connection the alloy "HIDUMINIUM" R.R.50 which develops high mechanical properties without resort to severe quenching treatments, has found wide use in the manufacture of highly stressed crankcases, cylinder blocks, cylinder heads and other large and complicated castings. In spite of its somewhat lower properties on test bars, R.R.50 has on many occasions outlived castings in high temperature treated alloys, which, while giving higher mechanical test figures, have failed through the augmentation of applied stresses by residual stresses set up in quenching operations. The heat treatment of this alloy consists of a single low temperature soaking period of 16 to 20 hours at 165 to 175 deg. C. HIGH DUTY ALLOYS LTD. SLOUGH Telephone : SLOUGH 21201 (6 lines) Telegrams : "ALLOYS, SLOUGH" P.T.O. | ||