: In this study, the transient liquid phase process between Inconel 617 and stainless steel 310 and its optimal parameters were investigated. For this purpose, AWS BNi-2, pure copper and Mn-25Ni-5Cr were used as the bonding layer. Bonding by AWS BNi-2 interlayer conducted at temperatures of 1040 to 1100 ° C and times of 5 to 90 minutes, and by copper interlayer conducted at 1075 ° C and time of 20 minutes. The sample was bonded by Mn-25Ni-5Cr interlayer at 1150 ° C for 45 minutes in a vacuum furnace and the samples were homogenized in an argon atmosphere furnace. Then, the optical and electron scanning microscopy microstructures, the chemical composition of the phases and changes in the concentration of elements at the joint, as well as the shear strength and joint hardness and the corrosion and creep resistance of the connected specimens were investigated and the parts were fractured. Based on the obtained results, optimal strength and hardness are observed in the bonded sample at 1040 temperature and time of 30 minutes, which is due to the completion of isothermal solidification and low concentration of metallic compounds based on boride. In addition, as the temperature and bonding time increase, the thickness of the diffusion affected zone increases. The results showed that the homogenization operation improves the properties, because the diffusion of the interlayer elements into the base metals is relatively complete. In the copper and manganese base alloy interlayers, due to the lack of eutectic transformation and high thickness of the interlayer, respectively, good microstructural and mechanical properties were not obtained. Findings of non-destructive and destructive corrosion tests on alloys and base metals showed that the base metal of 310 stainless steel due to the presence of chromium-rich regions and the bonded sample at 1070 ° C due to the completion of isothermal solidification, respectively, had the best results. In addition, high temperature creep test was performed on the bonded sample at 1070 °C and time of 30 minutes in three loads of 240, 289 and 336 MPa at a constant temperature of 600 ° C and was observed as the load increases, the rupture time decreases and the failure becomes brittle. Creep failure occurred in the base metal of 310 stainless steel, which indicates a lower creep resistance and rupture compared to the bonding and other base metal. Keywords: Transient Liquid Phase Joining Process, Isothermal Solidification, Inconel 617, Stainless Steel 310, Homogenization, Diffusion Affected Zone.
