Electron-beam additive manufacture to produced ER321/CuA19Mn2: microstructure and mechanical properties

Used electron-beam additive manufacture with two wire filaments simultaneously produced composite 321SS/CuA19Mn2 with 50:50 components ratio. Investigated of microstructure and mechanical properties of composite 321SS/CuA19Mn2 and compared with properties of stainless steel with aluminum bronze produced by electron beam additive manufacture. It was found that the formation of the composite 321SS/CuA19Mn2 leads suppresses of the residual β’-phase: diffusion of elements initiates phase transition from γ-Fe to α-Fe and leads to formed nanoparticles of κiv-phase in solid solution of α-Cu. Mechanical tensile tests and microhardness were showed composite 321SS/CuA19Mn2 have highest microhardness (∼3280 GPa) and highest tensile strength (830 MPa) as compared with steel and bronze produced by additive manufacture.