Amorphous Diffusion Bonding of Steel Pipe and Its Impact Toughness

摘要

An iron-base amorphous foil (FeNiCrSiB) was used as an interlayer for amorphous diffusion bonding of low carbon steel pipes under argon flux. The microstructure and mechanical properties of the joint were analyzed by EPMA, tensile test, bending test and impact test. The results show that the joint microstructure resembles to that of base metal and no precipitates form at the joint. Melting point depressants (B, Si) diffuse far away from the joint and the base metal element is homogenous across the joint. The joint impact toughness is greater than base metal toughness and the mechanical properties of the joint are similar around the pipe.