A pulse-heating apparatus for the investigation of rapid phase transformations in metals

A pulse-heating apparatus for the investigation of phase transformations in rapidly heated metals is described. The apparatus has a welding transformer as the power source and samples can be resistance heated at rates of 10² to 10⁵ degrees C s^-1. A theoretical treatment is given of the correction of the pulse length for the heating up and quenching time. Work on the recrystallization of rapidly heated, high-purity nickel is briefly described with particular reference to the results obtained at an annealing temperature of 500 degrees C.