engineering recuitment UPPSC AE Mock Test 2024 Engineering Materials Science Structure and Properties of Engineering Materials Phase Diagrams
According to binary phase diagram of Fe and Fe3C, the eutectoid reaction occurs on cooling a steel of 0.8% carbon through the eutectoid temperature (725°C). Then
1
fast cooling rate gives fine pearlite
2
by cooling, simply transformation takes place without a compositional change
3
by cooling, simply austenite of 0.8% carbon decomposes to a mixture of ferrite (α) of 6.67% carbon and cementite of 0.02% carbon
4
by cooling, simply austenite of 0.8% carbon decomposes to a mixture of ferrite (α) of 0.02% carbon and cementite of 6.67% carbon