The effects of rare earths (RE) on the carburization of steel are examined
with four 0.2%C steels doped and undoped with RE. Clearly, both RE in carbu
rizer and RE in steel may accelerate the carburizing process. RE in carburi
zer is more effective at enhancing carburization than RE in steel. The mech
anism for this enhancement of carburization is that the RE oxide enhances t
he medium-sample interface reaction during carburizing. (C) 1999 Elsevier S
cience S.A. All rights reserved.