ON THE TRANSFORMATION IN EUTECTOID STEEL BY SUPER-RAPID HEATING.

In the previous paper the transformation temperature of pure iron by super-rapid heating was reported. In the present study the ( alpha plus Fe//3C yields gamma ) A//c//1 transformation behavior in eutectoid steel by super-rapid heating at 0 similar 10**7 degree C/sec was investigated using the same method as used for pure iron. The main results obtained are as follows: (1) The heating cycles up to the heating rate of 10**7 degree C/sec were recorded by the PbS cell heat-radiater and the dilatometer, from which the ( alpha plus Fe//3C yields gamma ) transformation temperature was determined. (2) The increment of the transformation point from the equilibrium point (A//c//1) in the eutectoid steel with heating rate (0 similar 10**7 degree C/sec) was determined. The A(clf) transformation curve is split up into two steps and in the lamellar pearlite specimen A(clf) was detected around 1100 degree C at the heating rate of 10**7 degree C/sec.