The following tabulated data were gathered from a series of Charpy impact tests on a tempered 4340 steel alloy.
Temperature (°C) | Impact Energy (J) |
0 | 105 |
-25 | 104 |
-50 | 103 |
-75 | 97 |
-100 | 63 |
-113 | 40 |
-125 | 34 |
-150 | 28 |
-175 | 25 |
-200 | 24 |
(a) Plot the data as impact energy versus temperature.
(b) Determine a ductile-to-brittle transition temperature as the temperature corresponding to the average of the maximum and minimum impact energies.
(c) Determine a ductile-to-brittle transition temperature as the temperature at which the impact energy is 50 J.
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