Text: Question 2 (20 points) Describe the effect of carbon content of plain carbon steel on the ductile-brittle transition temperature. Impact testing on plain carbon steel gave the following values:
Temperature (°C) Absorbed Energy (J) Cleavage Fracture (%)
50 76 0
40 76 0
30 71 0
20 58 10
10 38 35
0 23 60
-10 14 85
-20 9 95
-30 5 100
-40 1.5 100
Draw the Absorbed energy vs Temperature and Cleavage Fracture vs Temperature for these steel. From the curves, find the ductile-brittle transition temperature. Explain the criteria used.
What will be the lowest acceptable service temperature? Explain.