Dissimilar Transient Liquid Phase Bonding of Ti-۶Al-۴V to UNS۳۲۷۵۰ and Evaluating the Joint Properties

The UNS۳۲۷۵۰ stainless steel and Titanium alloys are being extensively used in different industries such as aerospace, medical, and pipelines due to their great features of high-temperature corrosion resistance, weldability, and high strength to weight ratio.Therefore, the joining of these alloys is considered to be industrially effective and reduce costs. The current study researches the dissimilar bonding and properties evaluation of Ti-۶Al-۴V to UNS۳۲۷۵۰ stainless steel joint using Transient Liquid Phase bonding. The process was conducted at a constant time of ۶۰ min and various temperatures of ۹۰۰,۹۵۰, and ۱۰۰۰oC with a Cu foil as an interlayer. The microstructure evaluation and phase recognition were done using a Scanning Electron Microscope (SEM) with an equippedEnergy Dispersive Spectroscopy (EDS) feature. Also, the X-ray Diffraction analysis confirmed the formed phases which were predicted by the EDS analysis. Increasing the temperature up to ۹۵۰oC improved the strength value from ۲۵۶ to ۲۶۶ MPa. While by reaching the highest temperature of ۱۰۰۰oC the strength value even dropped lower than that ۹۰۰oC value to ۲۴۰ MPa. The strength increase is addressed by Isothermal Solidification Zone (ISZ) formation. Although the joint of ۱۰۰۰oC showed a wider ISZ, the brittle Intermetallic Compounds (IMCs) existence such as FeTi, Fe۲Ti, and Cr۲Ti, especially at UNS۳۲۷۵۰/interlayer interface caused the joint to fail at lower applied stress

کلیدواژه ها:

Transient Liquid Phase bonding ، UNS۳۲۷۵۰ stainless steel ، Ti-۶Al-۴V alloy