702405.fig.007a
(a)
702405.fig.007b
(b)
702405.fig.007c
(c)
702405.fig.007d
(d)
Figure 7: The microstructure of the welded joint of the thickness at : the fine-grained structure of the base material after rolling with the phase  α  coming into the heat-affected zone with thick grains, inclusions of the phase  β  (a); partial or complete recrystallization of the phases and  β  (b); thick grains of the phases and great dislocation density (c); the phase spines and the deformation twins (d).