) Determine a ductile-to-brittle transition temperature as that temperature corresponding to the average of the maximum and minimum impact energies. (b) Determine a ductile-to-brittle transition temperature as that temperature at which the impact energy is 80 J.

a) To determine a deductile to brittle transisition temperature corresponding to the average of the maximum and minimum impact energy we use the attached diagram.

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

As indicated on the plot by the one set of dashed lines, the ductile-to-brittle transition temperature according to this criterion is about –105°C

b) To determine a ductile to brittle transistion temperature as that temperature at which the impact energy is 80J.

Also, as noted on the plot by the other set of dashed lines, the ductile-to-brittle transition temperature for an impact energy of 80 J is about –95°C

AFOKE88 AFOKE88 · Answer 2 · 2020-03-13T12:54:32+01:00

The question is not complete and the complete question is;

The following tabulated data were gathered from a series of Charpy impact tests on a commercial low-carbon steel alloy.

Temperature(∘C); - 25, -50, -75, -85, -100, -110, -125, -150, -175

Impact energy (J); 124, 123, 115, 100, 73, 52, 26, 9, 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.

Answer:

A) Graph is attached

B) -105°C

C) -95°C

Explanation:

A) I have attached the plotted graph of impact energy versus temperature.

B) We want to find the ductile-to-brittle transition temperature as that temperature corresponding to the average of the maximum and minimum impact energies.

So; The maximum impact energy = 124J while the minimum impact energy is 6J

Thus, the average is = (124 + 6)/2 = 65J.

The temperature corresponding to this value from the graph is about

-105°C

C) From the graph attached, temperature at which the impact energy is 80 J is seen to be -95°C