In this research, joining of 310 Stainless Steel to 617 Inconel superalloy through Transient Liquid Phase Bonding (TLP) has been studied. In doing so, samples with the size of 10×10×5 mm is prepared, and then the surfaces to be joined were grounded and degreased. Thereafter, AWS BNi2 foil as interlayer placed between base materials and this set put inside a fixture. The fixture made of graphite and the purpose of its utilization was maintaining of samples alignment. To decrease bonding time and temperature, on each brazing set an additional specimen were put, 383Pa exerted. Bonding of specimens accomplished under argon atmosphere in 1050 ?C and 1100 ?C for 10, 22, 37, 50 and 60 minutes. Afterward, joints with complete isothermally solidified microstructure was homogenized in 1170 ?C for 180 minutes. Then, samples were cut and prepared for optical metallography. To investigate more details of microstructures, samples were studied by scanning electron microscopy (SEM). Also, distribution of alloying elements around joints area was studied by using of Energy Dispersive Spectroscopy (EDS) technique. Finally, mechanical properties of joints were evaluated through measuring of shear strength as well as assaying of hardness profile around joint area. Results revealed that samples which bonded in 1050 ?C and 60 minute as well as 1100 ?C and 50 minute had a complete isothermally solidification, other bonded samples were comprised some athermally solidification zone (ASZ) and the width of this region was decreased by increasing bonding time and temperature. In interface of base materials and interlayer of bonded samples, concentration of alloying elements beside microstructural differences were detected. Such regions were evidences for diffusion affected zone (DAZ) and their extent decreased by increasing the bonding time and temperature while the quantity of intermetallic phases decreased. The intermetallic phases of DAZ supposed to be borides. Phases of interlayer were included of nickel based proeutectic solid solution in isothermally solidified zone (ISZ) and a mixture of nickel based eutectic solid solution, borides and silicides in ASZ. Analyzing of microhardness profile around bonding region of samples which were bonded through different parameters showed increasing of hardness in DAZ and ASZ. In addition, by increasing of bonding time and temperature, the hardness changes in base material and DAZ showed a gentle gradient beside, that maximum hardness of all zones decreased. Investigation of microstructure and microhardness profile of homogenized specimen was an evident for DAZ elimination. Evaluation of shear strength of all samples represented maximum hardness for homogenized one while in others the shear strength increased by increasing of bonding time and temperature. Keywords : Transient Liquid Phase Bonding, Isothermall Solidification, 617 Inconel, 310 Stainless Steel, Diffusion Affected Zone.