Ehsan Baharzadeh - Advanced Materials Research Center, Department of Materials Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran
Morteza Shamanian - Department of Materials Engineering, Isfahan University of Technology, Isfahan, Iran
Mahdi Rafiei - Advanced Materials Research Center, Department of Materials Engineering, Najafabad Branch,Islamic Azad University, Najafabad, Iran
Hossein Mostaan - Faculty of Engineering, Department of Materials and Metallurgical Engineering, Arak University, Arak, Iran

In this study, dissimilar transient liquid phase bonding of SAF 2205 and IN X-750 alloys was investigated. The joining process was carried out at 1100 °C for different bondingtimes of 1, 15, and 30 min with BNi-3 interlayer. Characterization of the bonded samples was performed using optical microscopy and scanning electron microscopy equippedwith energy-dispersive X-ray spectroscopy and electron backscatter diffraction technique. In addition, microhardness and shear strength tests were done to measure themechanical properties. The results of microstructural studies showed that due to the bonding process, several zones with different microstructures have been created in thebonding region. The width of these zones depended on the holding time of the process. The results of EBSD studies showed that different phases such as BN, Ni3B, CrB, Cr2Band Ni2Si were formed in the bonding area. Isothermal solidification was completed in 30 min. The results of microhardness test in the joint area also showed that the maximum hardness was about 850 HV, which had belonged to the athermally-solidified zone. The maximum shear strength was about 465 MPa, which had belonged to the bonded sample with complete isothermal solidification. The fracture mechanism also changed due to the microstructure difference of the samples from brittle fracture in samples with athermal solidification structure to ductile fracture in samples without athermal solidification zone. The results obtained from the simulation of residual stresses showed that the maximum difference in residual stresses was between athermal solidification and isothermal solidification zones, which could increase the possibility of nucleation and propagation of cracks in the interface of these zones.

Transient Liquid Phase, Inconel X-750, 2205 duplex stainless Steel, Shear Tensile Strength, Residual Stress.