railway RRB JE (CBT I + CBT II) Mock Test 2024 Engineering Materials Science Structure and Properties of Engineering Materials Phase Diagrams
In Fe-Fe3C phase diagram, the eutectoid composition is 0.8 weight % of carbon at 725 ºC. The maximum solubility of carbon in α-ferrite phase is 0.025 weight % of carbon. A steel sample, having no other alloying element except 0.5 weight % of carbon, is slowly cooled from 1000 ºC to room temperature. The fraction of pro-eutectoid α-ferrite in the above steel sample at room temperature is
1
0.387
2
0.864
3
0.475
4
0.775