The following tabulated data were gathered from a series of Charpy impact tests on a tempered 4140 steel alloy.
Temperature (°C) | Impact Energy (J) |
100 | 89.3 |
75 | 88.6 |
50 | 87.6 |
25 | 85.4 |
0 | 82.9 |
–25 | 78.9 |
–50 | 73.1 |
–65 | 66.0 |
–75 | 59.3 |
–85 | 47.9 |
–100 | 34.3 |
–125 | 29.3 |
–150 | 27.1 |
–175 | 25.0 |
(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 70 J.
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