In order to roll the samples in the intercritical region, the strips were reheated to 1000[degrees]C for 10 minutes to fully austenitize
the microstructure, and then they were kept in a furnace for 15 minutes at the selected rolling temperatures.
In this paper we are focused on electron beam hardening, that use extremely high-energy input to austenitize
a very thin surface layer.
The alloy's full maximum/minimum specification for chemistry (0.18/0.23 carbon, 0.60/1.0 manganese, 0.3/0.6 silicon, 0.35 maximum phosphorous, 0.04 maximum sulfur, 0.4/0.7 nickel, 0.4/0.60 chromium and 0.15/0.25 molybdenum) and heat treatment (austenitize
at 1,650F, air quench and temper at 1,150F) ensured that the casting would meet specifications.
Heat the part to austenitize
in the temperature range of 1,550-1,700F (843-927C) for a time sufficient to produce a fully austenitic matrix that is saturated with the equilibrium carbon content.