Effect of Chemical Composition On the Magnetic Permeability Of Welded Joints of 316ln Austenitic Stainless Steel

Abstract

Abstract: We studied the characteristics of 316LN welded joints produced by different welding fillers through Tungsten Inert Gas welding (TIG). The microstructure of fusion zone (FZ) was characterized by means of scanning electron microscope (SEM), energy dispersion system (EDS) and electron back scatter diffraction (EBSD). The results of the study has demonstrated that high Mn content of welding filler produced a crack free and low magnetic permeability with mechanical properties. The high Mn content welding filler samples showed the ferrite was significantly reduced in the SEM microstructure. EBSD were employed to investigate the microstructural evolution of FZ during deformation. The improvement of Mn content showed considerable suppression of the formation of the serrated shape of large-angle austenitic grain boundaries.

Keywords: 316LN austenitic stainless steel, magnetic permeability, Ferrite, austenite