Question

The following tabulated data were gathered from a series of Charpy impact tests on a tempered 4340 steel alloy. Temperature (°C) 0 25 50 75 100 113 125 150 175 200 Impact Energy (J) 105 104 103 97 63 40 34 28 25 24 (a) Plot the data as impact energy versus temperature. (Hint: use engineering paper for the graph) (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 50J

Answer 1

To establish the temperature at which the transition from ductile to brittle occurs as being 80J. Another answer is 65 J.

To calculate the transition temperature from deductile to brittle that corresponds to the average of the maximum and least impact energy.

Standard = 124J + 6J / 2 = 65J

According to this criterion, the ductile-to-brittle transition temperature is approximately -105°C, as seen on the plot by the single set of dashed lines.

to establish the temperature at which the transition from ductile to brittle occurs as being 80J.

Additionally, the ductile-to-brittle transition temperature for an impact energy of 80 J is approximately -95°C, as shown on the plot by the other set of dashed lines.

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