Open AccessMicrostructural and mechanical investigation of brazing 304L Stainless Steel with corner joint using a Ni-based shim and wire
Author(s) -
Hedayat Mohammad Soltani,
Morteza Tayebi
Publication year - 2021
Publication title -
materials research express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.383
H-Index - 35
ISSN - 2053-1591
DOI - 10.1088/2053-1591/abf76c
Subject(s) - brazing , materials science , microstructure , indentation hardness , base metal , filler metal , composite material , joint (building) , metallurgy , diffusion bonding , scanning electron microscope , nickel , metal , filler (materials) , alloy , welding , architectural engineering , arc welding , engineering
This study investigated a suitable filler metal, diffusion depth of the elements of this filler metal in the base metal, and its effect on the mechanical properties of brazing bonding of sheets with different thicknesses of 304L stainless steel. For this purpose, brazing was performed with thermal induction under a vacuum of 10 −5 mbar and filler metal BNi-2 at the corner structures. First, the microstructure of different joint regions including base metals, Ni affected areas, and interfaces were examined by scanning electron microscopy and then the relationships between microstructure and microhardness were compared. In sheets with different thicknesses, the differences in diffusion depth were observed. Moreover, the microhardness of different areas of the braze was revealed to be completely affected by the diffusion of nickel. Finally, it was found that, for the bonding between 304L sheets with different thicknesses, BNi-2 filler metal had reasonable strength, diffusion, and filling for vacuum applications.