III. RESULTS AND DISCUSSION
A. Characteristics of High-Si and High-Al Basemetals
The phase transformation behavior of the high-Si and
high-Al steels used here differ significantly in terms of
their transformation temperatures and the phase fields
(Figure 1). The Ae3 temperature of the high-Si is about
885 C, whereas high-Al steel shows a higher Ae3
temperature (1036 C). The post-heat-treated microstructures
of both steels show the presence of RA in a
ferritic and bainitic microstructure (Figure 2).