The following tabulated data were gathered from a series of Charpy impact tests on a ductile cast iron.
Temperature (°C) | Impact Energy (J) |
–25 | 124 |
–50 | 123 |
–75 | 115 |
–85 | 100 |
–100 | 73 |
–110 | 52 |
–125 | 26 |
–150 | 9 |
–175 | 6 |
(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 80 J.
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