Abstract:
CHW-SMn submerged arc welding wire with CHF610 flux was used to perform submerged arc welding on low temperature high manganese steel under different heat inputs (12.0, 16.0, 20.0 kJ•cm
−1), and the effect of heat input on the microstructure and properties of the joint was studied. The results show that under three different heat inputs, the weld microstructure was composed of columnar crystal + precipitate, and the microstructure of the heat affected zone was austenite with a small amount of inclusions. The omicrostructure of the heat affected zone was coarsened and the width of the coarse crystal zone was increased. With the increase of heat input, the strength and toughness of the welded joint of low temperature and high manganese steel decreased, and the microhardness of the weld decreased first and then increased. When the heat input was 12.0 kJ•cm
−1 and 16.0 kJ•cm
−1, no cracks were observed on the surface of the bent weld, but cracks appeared when the heat input was 20.0 kJ•cm
−1; The tensile and impact fracture of the joint under different heat inputs were dimpled, and the fracture mode was ductile fracture. When the heat input was 12.0 kJ•cm
−1, the mechanical properties of the welded joint were better.