Why do cracks occur in the weld joint of Ti-22Al-25Nb alloy during post-weld heat treatment?

Citations Over TimeTop 1% of 2023 papers

Abstract

Ultrasonic pulse frequency tungsten inert gas welding technology was adopted to join Ti-22Al-25Nb alloy. There were some cracks in the Ti-22Al-25Nb alloy weld joint after post-weld heat treatment. The hardness and Young’s modulus of α 2 , O, and β /B2 phases in Ti-22Al-25Nb alloy were examined with an in situ nanoindentation technique. The phase transition stresses of three different phases in the weld joint of Ti-22Al-25Nb alloy were analyzed to explain why cracks occur in the weld joint of Ti-22Al-25Nb alloy during post-weld heat treatment. The results show that mean hardness is highest for the α 2 phase, second-highest for the O phase, and lowest for the β /B2 phase; the mean Young’s modulus has the same trend in Ti-22Al-25Nb alloy. Phase transition stress results in cracks in the weld joint of Ti-22Al-25Nb alloy during post-weld heat treatment. By improving post-weld heat treatment, the ultimate strength of the Ti-22Al-25Nb alloy weld joints reaches 750 MPa, which is 72.5% that of the base material.

Related Papers

• → Μicro-structured tungsten: an advanced plasma-facing material(2019)25 cited
• → Electrodeposition of tungsten coatings and deuterium irradiation behavior of tungsten coatings(2022)4 cited
• → Tungsten and molybdenum co-precipitation by α-benzoinoxime for activation analysis of tungsten(1976)9 cited
• → A preliminary study of production of tungsten-rhenium alloys in N-Reactor(1963)
• → Production of tungsten-rhenium alloys in N-reactor(1963)