Investigation of dissimilar joining ferritic stainless steel 430 to austenitic stainless steel 304 by transient liquid phase bonding process

Abstract

In this study, dissimilar joining of ferritic stainless steel 430 with austenitic stainless steel 304 with BNi-2 Interlayer was investigated by the joint process of the transient liquid phase under inert gas. The joint process was carried out at a constant temperature of 1120°C and at four storage times of 30, 60, 120 and 180 min. To investigate the microscopic structure of the optical microscope, a scanning electron microscope and an X-ray diffraction spectroscopy were used to investigate the mechanical properties of the microhardness and stretching device. At 120 min of storage, due to the proper penetration of the interlayer into base metals and the formation of intermetallic compounds, the hardness in the four dough areas, mashi zone, heat affected zone, joint and the base metal interface reached its maximum. The maximum shear strength was also achieved at the same temperature and storage time, equal to 860 kPa. during storage, 180 min, although proper penetration of the interlayer was performed in base metals, but due to an increase in the diameter of the ferritic stainless steel grains from 10 to 35 µm and the austenitic steel ranged from 7 to 29 µm, relative strength and hardness were reduced.