Fig. 15a shows lath martensite microstructure
of the State A which was quenched, while Figs
15b and c are showing the States B and C which
were tempered. Lath martensite microstructure and
low tempered martensite can be observed in these
samples. Low temperature tempering of the martensite
microstructure is not used to transform martensite
into other microstructure but just for the purpose of
residual stress relaxation in the material [13] and [14].