Structural and mechanical properties of stainless steel formed under conditions of layer-by-layer fusion of a wire by an electron beam

OBRABOTKAMETALLOV MATERIAL SCIENCE Vol. 23 No. 4 2021 Fig. 6. XRD analysis of WAAM -obtained AISI 308LSi steel specimens Fig. 7. Diffraction patterns of the specimen with the plane parallel to the sintered layers (a) and a fragment of the diffraction pattern with structural line (222) of the  -( Fe , Cr , Ni ) phase ( b ) Fig. 8. Diffraction patterns of the specimen with the plane perpendicular to the sintered layers (a) and a fragment of the diffraction pattern with structural line (222) of the  -( Fe , Cr , Ni ) phase ( b ) In this diagram, the asterisk denotes the location of the three-component alloy with the chemical composition of the steel under study. During the crystallization of an alloy with such a composition under conditions of nonequilibrium processes, as in the case of layer-by-layer formation of an ingot by electron- beam deposition welding, a two-phase mixture from two solid solutions based on BCC and FCC lattices can form: γ -( Fe , Ni , Cr ) and  -( Cr , Ni , Fe ). The pro fi le of γ -( Fe , Ni , Cr ) structure lines was analyzed in the diffraction patterns from the high-angle region 2  . It was established that the pro fi le of structural lines (222), (400) and (331) of the γ -( Fe , Ni , Cr ) phase from the high-angle region 2  can be represented as a superposition of two lines from the phases with close lattice parameters. The revealed complex pro fi le of the structural lines of γ -( Fe , Ni , Cr ) phase testi fi es to nonuniform chemical composition on the specimen surface comprised of compositions based