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).
Analysis and strength testing of cast iron specimens with varying Molybdenum and Chromium content.
| Identifier | ExFiles\Box 132\1\ scan0015 | |
| Date | 18th April 1927 guessed | |
| - 3 - of casting in the foundry. Two single Alloys - Molybdenum and Chromium - were favoured as having possibilities to materially assist in the obtaining of these two desirable characteristics in conjunction with varying Total Carbon contents. Exploratory tests were, therefore, put through as a guide to the amounts of these elements which should be added and the strength values ascertained. Six specimens forming one series were prepared from cast iron containing varying proportions of molybdenum up to 1.0% approx., the second series of six specimens was prepared from a 0.29% Chromium cast iron also containing various proportions of Molybdenum up to 1.0%. The chemical analyses of the various irons are as follows:- Indent. T.C. Si. Mn. S. P. Cr.{Mr Cra???ster / Mr Chichester} Mo. No.0. 3.36 1.82 .40 .074 .15 - 0. " 1. 3.32 2.04 .46 .054 .17 - .21 " 2. 3.36 2.00 .48 .05 .15 - .42 " 3. 3.26 1.80 .40 .05 .15 - .60 " 5. 3.25 1.81 .40 .05 .15 - .86 " 4. 3.27 2.08 .44 .05 .15 - 1.05 MoCr.0. 3.30 2.04 .50 .09 .14 .29 0. " 1. 3.40 2.00 .53 .05 .14 .29 .24 " 2. 3.30 2.02 .55 .05 .14 .29 .34 " 3. 3.40 2.00 .55 .052 .14 .29 .72 " 6. 3.30 1.90 .51 .05 .14 .27 .84 " 4. 3.45 2.00 .55 .05 .14 .29 1.00 Test pieces cut from the above specimens were tested for Tensile Strength at ordinary temperatures, and also at 500°C. The tests were carried out on bars 0.564" diameter, except for those at the high temperature, in which case the test specimens were of 0.357" diameter and gauge length 1.625, and were tested in tension using self-aligning shackles at a temperature of 500°C., and at a rate of strain of 0.001 per minute. The following tables give the values obtained:- U.T.S. Tons per sq. Inch. Hardness No. Ordinary Temp No.0. ... 18.36 241. " 1. ... 19.02 241. " 2. ... 20.14 229. " 3. ... 21.60 255. " 5. ... 23.80 269. " 4. ... 23.64 269. MoCr.0. ... 18.72 229. " 1. ... 19.18 229. " 2. ... 20.24 241. " 3. ... 22.42 255. " 6. ... 23.54 269. " 4. ... 23.90 269. High Temp. Elongation. No.0. ... 10.8 2.18 " 1. ... 11.7 1.94 " 2. ... 12.4 1.94 " 3. ... 14.85 1.90 " 5. ... 17.65 2.06 " 4. ... 16.95 1.97 | ||