Question: (a) A series of Charpy impact tests were performed on a particular structural steel. The measured data is showed in Table Q3. i) ii)

(a) A series of Charpy impact tests were performed on a particular structural steel. The measured data is

(a) A series of Charpy impact tests were performed on a particular structural steel. The measured data is showed in Table Q3. i) ii) v) vi) Table 03 Temperature, C Impact energy, J 169 83.0 60.0 47.5 35.0 22.5 10.0 -2.5 -15.0 -27.5 -40.0 -65.0 -77.5 -90.0 -102.5 -115.0 -127.0 167.5 165 160 152 142 132 123 110 97 60 39 23 15 12 11 Plot the data as impact energy versus temperature. [4 marks] Identify the ductile to brittle transition temperature as corresponding average of the maximum and minimum impact energy. [4 marks] Explain the reason why ductile fracture is often better than brittle fracture. [6 marks] Based on the plot of impact energy versus temperature in Part a(i), quote the lattice structure of the structural steel. [2 marks]

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