Inconel 718 Investment-ST Investment Casting: MIL-HDBK-5J Design Allowables
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| Material class | Heat-Resistant |
| Alloy / temper / form | Inconel 718 Investment / ST / Investment Casting |
| Specifications | AMS 5383 |
| Handbook | MIL-HDBK-5J, 31 January 2003, section 6.3.5.0, Table 6.3.5.0(d) (pdf page 54 of the chapter file) |
| Dimension bands | 1 |
| Density | 0.297 lb/in3 |
Design Mechanical and Physical Properties (room temperature)
As printed in the handbook table. Bases: A and B are statistical minimums (99 % and 90 % probability at 95 % confidence), S the specification minimum. Grain directions: L longitudinal, LT long transverse, ST short transverse.
| Dimension band | 0.000–0.500 in | |
|---|---|---|
| Specification | AMS 5383 | |
| Basis | S | |
| Ftu, ksi | 120 | |
| Fty, ksi | 105 | |
| Fcy, ksi | 105 | |
| Fsu, ksi | 88 | |
| Fbru (e/D = 1.5), ksi | 202 | |
| Fbru (e/D = 2.0), ksi | 248 | |
| Fbry (e/D = 1.5), ksi | 161 | |
| Fbry (e/D = 2.0), ksi | 188 | |
| e, % | 3 | |
| E, Msi | 29.4 | |
| Ec, Msi | 30.9 | |
| G, Msi | 11.4 | |
| ν | 0.29 | |
| ρ, lb/in3 | 0.297 | |
Effect of Temperature
Percent of the room-temperature value against temperature, digitized from the handbook figures (the shortest exposure of each figure, every 10 °F). Strength curves give the allowable at temperature; "after exposure" curves give the room-temperature property after a soak at that temperature.
Strength allowables at temperature, percent of room temperature
Moduli at temperature
| °F | F_tu | F_ty |
|---|---|---|
| -300 | 115.8 | 115.8 |
| -200 | 111.1 | 111.1 |
| -100 | 106.6 | 106.6 |
| 0 | 102.5 | 102.5 |
| 100 | 99.8 | 99.8 |
| 200 | 97.2 | 97.2 |
| 300 | 95.9 | 95.9 |
| 400 | 94.5 | 94.5 |
| 500 | 93.8 | 93.8 |
| 600 | 92.8 | 92.8 |
| 700 | 92.1 | 92.1 |
| 800 | 91.2 | 91.2 |
| 1000 | 89.3 | 89.3 |
| 1200 | 80.6 | 80.6 |
Factors in percent of the room-temperature allowable.
Source and Use
U.S. Department of Defense (2003). Metallic Materials and Elements for Aerospace Vehicle Structures. MIL-HDBK-5J, 31 January 2003 (public domain). The values are the handbook's design allowables as extracted from the chapter tables; check the printed table before use in a certified analysis, and note that MIL-HDBK-5J was superseded by MMPDS, whose later editions may differ. No warranty is given.