The change from graphite into cementite is supposed to take place as we pass from left to right.
Lastly, there is a definite compound of iron and carbon, iron carbide or cementite, having the formula Fe3C.
Ferrite and cementite, already described in 10, are the final products of the transformation of austenite in slow-cooling.
Here the mass consists of primary austenite, eutectic austenite and cementite interstratified and pro-eutectoid cementite.
The white-hot, solid, but soft mass is now a conglomerate of “primary” austenite, “eutectic” austenite and “eutectic” cementite.