Structural investigations of Fe-Zr-Si-Cu metallic glass with low glass-forming ability produced in laser powder bed fusion technology

•High laser energy density in the L-PBF technology induces the crystallization in the melt pool.•Low laser energy density reduces the crystallization but increase the contribution of large pores.•On the fusion line crystalize mainly the primary α-Fe(Si) phase.•In the pool area during the L-PBF process a nanocomposite consisting of α-Fe(Si) solid solution and amorphous matrix is formed.